Build e-commerce API with FastAPI and SQLite

Create a complete e-commerce application with the following features:
- User authentication and authorization
- Product and category management
- Shopping cart functionality
- Order processing
- Database migrations with Alembic
- Comprehensive documentation

README.md

@@ -1,3 +1,135 @@
-# FastAPI Application
+# E-Commerce API
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A full-featured e-commerce API built with FastAPI and SQLite.
+
+## Features
+
+- **User Management**: Registration, authentication, and profile management
+- **Product Management**: Products with categories, pricing, and inventory management
+- **Shopping Cart**: Add, update, remove items in user's shopping cart
+- **Order Processing**: Create orders from cart, track order status
+- **Authentication**: JWT-based authentication with role-based access control
+
+## Tech Stack
+
+- **FastAPI**: Modern, fast API framework
+- **SQLAlchemy**: SQL toolkit and ORM
+- **Alembic**: Database migration tool
+- **SQLite**: Serverless database engine
+- **JWT**: JSON Web Tokens for authentication
+- **Pydantic**: Data validation and settings management
+
+## API Endpoints
+
+### Authentication
+
+- `POST /api/v1/auth/login`: Login and get access token
+- `POST /api/v1/auth/register`: Register a new user
+- `GET /api/v1/auth/me`: Get current user information
+
+### Users
+
+- `GET /api/v1/users/`: List all users (admin only)
+- `POST /api/v1/users/`: Create a new user (admin only)
+- `GET /api/v1/users/me`: Get current user profile
+- `PUT /api/v1/users/me`: Update current user profile
+- `GET /api/v1/users/{user_id}`: Get user by ID
+- `PUT /api/v1/users/{user_id}`: Update user (admin only)
+
+### Categories
+
+- `GET /api/v1/categories/`: List all categories
+- `POST /api/v1/categories/`: Create a new category (admin only)
+- `GET /api/v1/categories/{category_id}`: Get category by ID
+- `PUT /api/v1/categories/{category_id}`: Update category (admin only)
+- `DELETE /api/v1/categories/{category_id}`: Delete category (admin only)
+
+### Products
+
+- `GET /api/v1/products/`: List all products (filter by category optional)
+- `POST /api/v1/products/`: Create a new product (admin only)
+- `GET /api/v1/products/{product_id}`: Get product by ID
+- `PUT /api/v1/products/{product_id}`: Update product (admin only)
+- `DELETE /api/v1/products/{product_id}`: Delete product (admin only)
+
+### Cart
+
+- `GET /api/v1/cart/`: Get current user's cart
+- `POST /api/v1/cart/items`: Add item to cart
+- `PUT /api/v1/cart/items/{item_id}`: Update cart item quantity
+- `DELETE /api/v1/cart/items/{item_id}`: Remove item from cart
+- `DELETE /api/v1/cart/`: Clear cart
+
+### Orders
+
+- `GET /api/v1/orders/`: List user's orders
+- `POST /api/v1/orders/`: Create new order from cart
+- `GET /api/v1/orders/{order_id}`: Get order by ID
+- `PUT /api/v1/orders/{order_id}`: Update order status (admin only)
+- `POST /api/v1/orders/{order_id}/cancel`: Cancel order (if pending)
+
+### Health Check
+
+- `GET /health`: Application health check
+
+## Installation and Setup
+
+### Prerequisites
+
+- Python 3.8+
+- pip (Python package installer)
+
+### Installation
+
+1. Clone the repository
+```bash
+git clone <repository-url>
+cd ecommerceapplication
+```
+
+2. Install dependencies
+```bash
+pip install -r requirements.txt
+```
+
+3. Run database migrations
+```bash
+alembic upgrade head
+```
+
+4. Start the application
+```bash
+uvicorn main:app --reload
+```
+
+The API will be available at http://localhost:8000.
+
+## Documentation
+
+FastAPI provides automatic API documentation:
+- Swagger UI: http://localhost:8000/docs
+- ReDoc: http://localhost:8000/redoc
+
+## Development
+
+### Database Migrations
+
+Create a new migration after model changes:
+```bash
+alembic revision --autogenerate -m "Description of changes"
+```
+
+Apply migrations:
+```bash
+alembic upgrade head
+```
+
+### Running Tests
+
+```bash
+pytest
+```
+
+## License
+
+This project is licensed under the MIT License - see the LICENSE file for details.

alembic.ini

@@ -0,0 +1,105 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = migrations
+
+# template used to generate migration file names; The default value is %%(rev)s_%%(slug)s
+# Uncomment the line below if you want the files to be prepended with date and time
+# see https://alembic.sqlalchemy.org/en/latest/tutorial.html#editing-the-ini-file
+# for all available tokens
+# file_template = %%(year)d_%%(month).2d_%%(day).2d_%%(hour).2d%%(minute).2d-%%(rev)s_%%(slug)s
+
+# sys.path path, will be prepended to sys.path if present.
+# defaults to the current working directory.
+prepend_sys_path = .
+
+# timezone to use when rendering the date within the migration file
+# as well as the filename.
+# If specified, requires the python-dateutil library that can be
+# installed by adding `alembic[tz]` to the pip requirements
+# string value is passed to dateutil.tz.gettz()
+# leave blank for localtime
+# timezone =
+
+# max length of characters to apply to the
+# "slug" field
+# truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+# version location specification; This defaults
+# to migrations/versions.  When using multiple version
+# directories, initial revisions must be specified with --version-path.
+# The path separator used here should be the separator specified by "version_path_separator" below.
+# version_locations = %(here)s/bar:%(here)s/bat:migrations/versions
+
+# version path separator; As mentioned above, this is the character used to split
+# version_locations. The default within new alembic.ini files is "os", which uses os.pathsep.
+# If this key is omitted entirely, it falls back to the legacy behavior of splitting on spaces and/or commas.
+# Valid values for version_path_separator are:
+#
+# version_path_separator = :
+# version_path_separator = ;
+# version_path_separator = space
+version_path_separator = os  # Use os.pathsep. Default configuration used for new projects.
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+sqlalchemy.url = sqlite:////app/storage/db/db.sqlite
+
+
+[post_write_hooks]
+# post_write_hooks defines scripts or Python functions that are run
+# on newly generated revision scripts.  See the documentation for further
+# detail and examples
+
+# format using "black" - use the console_scripts runner, against the "black" entrypoint
+# hooks = black
+# black.type = console_scripts
+# black.entrypoint = black
+# black.options = -l 79 REVISION_SCRIPT_FILENAME
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

app/api/api.py

@@ -0,0 +1,19 @@
+from fastapi import APIRouter
+
+from app.api.endpoints import (
+    auth,
+    users,
+    products,
+    categories,
+    cart,
+    orders,
+)
+
+api_router = APIRouter()
+
+api_router.include_router(auth.router, prefix="/auth", tags=["Authentication"])
+api_router.include_router(users.router, prefix="/users", tags=["Users"])
+api_router.include_router(products.router, prefix="/products", tags=["Products"])
+api_router.include_router(categories.router, prefix="/categories", tags=["Categories"])
+api_router.include_router(cart.router, prefix="/cart", tags=["Cart"])
+api_router.include_router(orders.router, prefix="/orders", tags=["Orders"])

app/api/endpoints/auth.py

@@ -0,0 +1,86 @@
+from datetime import timedelta
+from typing import Any
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordRequestForm
+from sqlalchemy.orm import Session
+
+from app.core import security
+from app.core.config import settings
+from app.core.deps import get_current_user
+from app.db.session import get_db
+from app.models.user import User
+from app.schemas.token import Token
+from app.services import user as user_service
+
+router = APIRouter()
+
+
+@router.post("/login", response_model=Token)
+def login_access_token(
+    db: Session = Depends(get_db),
+    form_data: OAuth2PasswordRequestForm = Depends(),
+) -> Any:
+    """
+    OAuth2 compatible token login, get an access token for future requests
+    """
+    user = user_service.authenticate(db, email=form_data.username, password=form_data.password)
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect email or password",
+        )
+    elif not user_service.is_active(user):
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Inactive user",
+        )
+    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+    return {
+        "access_token": security.create_access_token(
+            user.id, expires_delta=access_token_expires
+        ),
+        "token_type": "bearer",
+    }
+
+
+@router.post("/register", response_model=Token)
+def register_user(
+    *,
+    db: Session = Depends(get_db),
+    form_data: OAuth2PasswordRequestForm = Depends(),
+) -> Any:
+    """
+    Register a new user and return an access token
+    """
+    user = user_service.get_by_email(db, email=form_data.username)
+    if user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="A user with this email already exists",
+        )
+    
+    # Create user
+    from app.schemas.user import UserCreate
+    user_in = UserCreate(email=form_data.username, password=form_data.password)
+    user = user_service.create(db, obj_in=user_in)
+    
+    # Generate token
+    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+    return {
+        "access_token": security.create_access_token(
+            user.id, expires_delta=access_token_expires
+        ),
+        "token_type": "bearer",
+    }
+
+
+@router.get("/me", response_model=Any)
+def read_users_me(
+    current_user: User = Depends(get_current_user),
+) -> Any:
+    """
+    Get current user
+    """
+    from app.schemas.user import User as UserSchema
+    return UserSchema.from_orm(current_user)

app/api/endpoints/cart.py

@@ -0,0 +1,151 @@
+from typing import Any, Dict
+
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+
+from app.core.deps import get_current_active_user, get_db
+from app.models.user import User
+from app.schemas.cart import Cart, CartItem, CartItemCreate, CartItemUpdate
+from app.services import cart as cart_service
+from app.services import product as product_service
+
+router = APIRouter()
+
+
+@router.get("/", response_model=Cart)
+def read_cart(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Get current user's cart
+    """
+    cart = cart_service.get_by_user_id(db, user_id=current_user.id)
+    if not cart:
+        # Create a new cart if it doesn't exist
+        cart = cart_service.ensure_cart_exists(db, user_id=current_user.id)
+    return cart
+
+
+@router.post("/items", response_model=CartItem)
+def add_cart_item(
+    *,
+    db: Session = Depends(get_db),
+    item_in: CartItemCreate,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Add item to cart
+    """
+    # Verify product exists and is active
+    product = product_service.get_by_id(db, product_id=item_in.product_id)
+    if not product or not product.is_active:
+        raise HTTPException(
+            status_code=404,
+            detail="Product not found or unavailable",
+        )
+    
+    # Check stock
+    if product.stock < item_in.quantity:
+        raise HTTPException(
+            status_code=400,
+            detail=f"Not enough stock. Available: {product.stock}",
+        )
+    
+    # Ensure cart exists
+    cart = cart_service.ensure_cart_exists(db, user_id=current_user.id)
+    
+    # Add item to cart
+    cart_item = cart_service.add_to_cart(db, cart_id=cart.id, obj_in=item_in)
+    return cart_item
+
+
+@router.put("/items/{item_id}", response_model=CartItem)
+def update_cart_item(
+    *,
+    db: Session = Depends(get_db),
+    item_id: str,
+    item_in: CartItemUpdate,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Update cart item quantity
+    """
+    # Ensure cart exists
+    cart = cart_service.ensure_cart_exists(db, user_id=current_user.id)
+    
+    # Verify cart item exists and belongs to current user's cart
+    cart_item = db.query(Cart).filter(
+        Cart.id == cart.id
+    ).join(
+        CartItem, CartItem.cart_id == Cart.id
+    ).filter(
+        CartItem.id == item_id
+    ).first()
+    
+    if not cart_item:
+        raise HTTPException(
+            status_code=404,
+            detail="Cart item not found",
+        )
+    
+    # Check product stock
+    product = product_service.get_by_id(db, product_id=cart_item.product_id)
+    if product.stock < item_in.quantity:
+        raise HTTPException(
+            status_code=400,
+            detail=f"Not enough stock. Available: {product.stock}",
+        )
+    
+    # Update cart item
+    updated_item = cart_service.update_cart_item(db, item_id=item_id, obj_in=item_in)
+    return updated_item
+
+
+@router.delete("/items/{item_id}", response_model=Dict[str, str])
+def delete_cart_item(
+    *,
+    db: Session = Depends(get_db),
+    item_id: str,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Remove item from cart
+    """
+    # Ensure cart exists
+    cart = cart_service.ensure_cart_exists(db, user_id=current_user.id)
+    
+    # Verify cart item exists and belongs to current user's cart
+    cart_item = db.query(Cart).filter(
+        Cart.id == cart.id
+    ).join(
+        CartItem, CartItem.cart_id == Cart.id
+    ).filter(
+        CartItem.id == item_id
+    ).first()
+    
+    if not cart_item:
+        raise HTTPException(
+            status_code=404,
+            detail="Cart item not found",
+        )
+    
+    # Remove item from cart
+    cart_service.remove_from_cart(db, item_id=item_id)
+    return {"status": "success", "message": "Item removed from cart"}
+
+
+@router.delete("/", response_model=Dict[str, str])
+def clear_cart(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Clear cart
+    """
+    # Ensure cart exists
+    cart = cart_service.ensure_cart_exists(db, user_id=current_user.id)
+    
+    # Clear cart
+    cart_service.clear_cart(db, cart_id=cart.id)
+    return {"status": "success", "message": "Cart cleared"}

app/api/endpoints/categories.py

@@ -0,0 +1,105 @@
+from typing import Any, List
+
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+
+from app.core.deps import get_current_active_superuser, get_current_active_user, get_db
+from app.models.user import User
+from app.schemas.category import Category, CategoryCreate, CategoryUpdate
+from app.services import category as category_service
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[Category])
+def read_categories(
+    db: Session = Depends(get_db),
+    skip: int = 0,
+    limit: int = 100,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Retrieve categories.
+    """
+    categories = category_service.get_multi(db, skip=skip, limit=limit)
+    return categories
+
+
+@router.post("/", response_model=Category)
+def create_category(
+    *,
+    db: Session = Depends(get_db),
+    category_in: CategoryCreate,
+    current_user: User = Depends(get_current_active_superuser),
+) -> Any:
+    """
+    Create new category.
+    """
+    category = category_service.get_by_name(db, name=category_in.name)
+    if category:
+        raise HTTPException(
+            status_code=400,
+            detail="A category with this name already exists",
+        )
+    category = category_service.create(db, obj_in=category_in)
+    return category
+
+
+@router.get("/{category_id}", response_model=Category)
+def read_category(
+    *,
+    db: Session = Depends(get_db),
+    category_id: str,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Get category by ID.
+    """
+    category = category_service.get_by_id(db, category_id=category_id)
+    if not category:
+        raise HTTPException(
+            status_code=404,
+            detail="Category not found",
+        )
+    return category
+
+
+@router.put("/{category_id}", response_model=Category)
+def update_category(
+    *,
+    db: Session = Depends(get_db),
+    category_id: str,
+    category_in: CategoryUpdate,
+    current_user: User = Depends(get_current_active_superuser),
+) -> Any:
+    """
+    Update a category.
+    """
+    category = category_service.get_by_id(db, category_id=category_id)
+    if not category:
+        raise HTTPException(
+            status_code=404,
+            detail="Category not found",
+        )
+    category = category_service.update(db, db_obj=category, obj_in=category_in)
+    return category
+
+
+@router.delete("/{category_id}", response_model=Category)
+def delete_category(
+    *,
+    db: Session = Depends(get_db),
+    category_id: str,
+    current_user: User = Depends(get_current_active_superuser),
+) -> Any:
+    """
+    Delete a category.
+    """
+    category = category_service.get_by_id(db, category_id=category_id)
+    if not category:
+        raise HTTPException(
+            status_code=404,
+            detail="Category not found",
+        )
+    category = category_service.delete(db, category_id=category_id)
+    return category

app/api/endpoints/orders.py

@@ -0,0 +1,180 @@
+from typing import Any, List
+
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+
+from app.core.deps import get_current_active_superuser, get_current_active_user, get_db
+from app.models.user import User
+from app.models.order import OrderStatus
+from app.schemas.order import Order, OrderCreate, OrderUpdate, OrderList, OrderItemCreate
+from app.services import order as order_service
+from app.services import cart as cart_service
+from app.services import product as product_service
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[OrderList])
+def read_orders(
+    db: Session = Depends(get_db),
+    skip: int = 0,
+    limit: int = 100,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Get user's orders
+    """
+    orders = order_service.get_by_user_id(
+        db, user_id=current_user.id, skip=skip, limit=limit
+    )
+    return orders
+
+
+@router.post("/", response_model=Order)
+def create_order(
+    *,
+    db: Session = Depends(get_db),
+    order_in: OrderCreate,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Create new order from user's cart
+    """
+    # Ensure cart exists
+    cart = cart_service.get_by_user_id(db, user_id=current_user.id)
+    if not cart:
+        raise HTTPException(
+            status_code=400,
+            detail="Cart is empty",
+        )
+    
+    # Get cart items
+    cart_items = cart_service.get_cart_items(db, cart_id=cart.id)
+    if not cart_items:
+        raise HTTPException(
+            status_code=400,
+            detail="Cart is empty",
+        )
+    
+    # Convert cart items to order items
+    order_items = []
+    for item in cart_items:
+        product = product_service.get_by_id(db, product_id=item.product_id)
+        if not product or not product.is_active:
+            raise HTTPException(
+                status_code=400,
+                detail=f"Product {item.product_id} is unavailable",
+            )
+        
+        # Check stock
+        if product.stock < item.quantity:
+            raise HTTPException(
+                status_code=400,
+                detail=f"Not enough stock for product {product.name}. Available: {product.stock}",
+            )
+        
+        order_item = OrderItemCreate(
+            product_id=item.product_id,
+            quantity=item.quantity,
+            price=product.price,
+        )
+        order_items.append(order_item)
+    
+    # Create order
+    order = order_service.create(
+        db, 
+        obj_in=OrderCreate(
+            user_id=current_user.id,
+            shipping_address=order_in.shipping_address,
+        ),
+        items=order_items,
+    )
+    
+    # Clear cart after order is created
+    cart_service.clear_cart(db, cart_id=cart.id)
+    
+    return order
+
+
+@router.get("/{order_id}", response_model=Order)
+def read_order(
+    *,
+    db: Session = Depends(get_db),
+    order_id: str,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Get order by ID
+    """
+    order = order_service.get_by_id(db, order_id=order_id)
+    if not order:
+        raise HTTPException(
+            status_code=404,
+            detail="Order not found",
+        )
+    
+    # Check if user is allowed to access this order
+    if order.user_id != current_user.id and not current_user.is_superuser:
+        raise HTTPException(
+            status_code=403,
+            detail="Not enough permissions",
+        )
+    
+    return order
+
+
+@router.put("/{order_id}", response_model=Order)
+def update_order(
+    *,
+    db: Session = Depends(get_db),
+    order_id: str,
+    order_in: OrderUpdate,
+    current_user: User = Depends(get_current_active_superuser),
+) -> Any:
+    """
+    Update order (admin only)
+    """
+    order = order_service.get_by_id(db, order_id=order_id)
+    if not order:
+        raise HTTPException(
+            status_code=404,
+            detail="Order not found",
+        )
+    
+    order = order_service.update(db, db_obj=order, obj_in=order_in)
+    return order
+
+
+@router.post("/{order_id}/cancel", response_model=Order)
+def cancel_order(
+    *,
+    db: Session = Depends(get_db),
+    order_id: str,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Cancel order
+    """
+    order = order_service.get_by_id(db, order_id=order_id)
+    if not order:
+        raise HTTPException(
+            status_code=404,
+            detail="Order not found",
+        )
+    
+    # Check if user is allowed to cancel this order
+    if order.user_id != current_user.id and not current_user.is_superuser:
+        raise HTTPException(
+            status_code=403,
+            detail="Not enough permissions",
+        )
+    
+    # Check if order can be cancelled
+    if order.status != OrderStatus.PENDING:
+        raise HTTPException(
+            status_code=400,
+            detail=f"Order with status {order.status} cannot be cancelled",
+        )
+    
+    order = order_service.cancel_order(db, order_id=order_id)
+    return order

app/api/endpoints/products.py

@@ -0,0 +1,128 @@
+from typing import Any, List
+
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy.orm import Session
+
+from app.core.deps import get_current_active_superuser, get_current_active_user, get_db
+from app.models.user import User
+from app.schemas.product import Product, ProductCreate, ProductList, ProductUpdate
+from app.services import product as product_service
+from app.services import category as category_service
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[ProductList])
+def read_products(
+    db: Session = Depends(get_db),
+    skip: int = 0,
+    limit: int = 100,
+    category_id: str = Query(None, description="Filter by category ID"),
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Retrieve products.
+    """
+    if category_id:
+        category = category_service.get_by_id(db, category_id=category_id)
+        if not category:
+            raise HTTPException(
+                status_code=404,
+                detail="Category not found",
+            )
+        products = product_service.get_by_category(
+            db, category_id=category_id, skip=skip, limit=limit
+        )
+    else:
+        products = product_service.get_multi(db, skip=skip, limit=limit)
+    return products
+
+
+@router.post("/", response_model=Product)
+def create_product(
+    *,
+    db: Session = Depends(get_db),
+    product_in: ProductCreate,
+    current_user: User = Depends(get_current_active_superuser),
+) -> Any:
+    """
+    Create new product.
+    """
+    category = category_service.get_by_id(db, category_id=product_in.category_id)
+    if not category:
+        raise HTTPException(
+            status_code=404,
+            detail="Category not found",
+        )
+    product = product_service.create(db, obj_in=product_in)
+    return product
+
+
+@router.get("/{product_id}", response_model=Product)
+def read_product(
+    *,
+    db: Session = Depends(get_db),
+    product_id: str,
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Get product by ID.
+    """
+    product = product_service.get_by_id(db, product_id=product_id)
+    if not product:
+        raise HTTPException(
+            status_code=404,
+            detail="Product not found",
+        )
+    return product
+
+
+@router.put("/{product_id}", response_model=Product)
+def update_product(
+    *,
+    db: Session = Depends(get_db),
+    product_id: str,
+    product_in: ProductUpdate,
+    current_user: User = Depends(get_current_active_superuser),
+) -> Any:
+    """
+    Update a product.
+    """
+    product = product_service.get_by_id(db, product_id=product_id)
+    if not product:
+        raise HTTPException(
+            status_code=404,
+            detail="Product not found",
+        )
+    
+    # Verify category exists if updating category
+    if product_in.category_id and product_in.category_id != product.category_id:
+        category = category_service.get_by_id(db, category_id=product_in.category_id)
+        if not category:
+            raise HTTPException(
+                status_code=404,
+                detail="Category not found",
+            )
+    
+    product = product_service.update(db, db_obj=product, obj_in=product_in)
+    return product
+
+
+@router.delete("/{product_id}", response_model=Product)
+def delete_product(
+    *,
+    db: Session = Depends(get_db),
+    product_id: str,
+    current_user: User = Depends(get_current_active_superuser),
+) -> Any:
+    """
+    Delete a product.
+    """
+    product = product_service.get_by_id(db, product_id=product_id)
+    if not product:
+        raise HTTPException(
+            status_code=404,
+            detail="Product not found",
+        )
+    product = product_service.delete(db, product_id=product_id)
+    return product

app/api/endpoints/users.py

@@ -0,0 +1,122 @@
+from typing import Any, List
+
+from fastapi import APIRouter, Body, Depends, HTTPException
+from fastapi.encoders import jsonable_encoder
+from pydantic import EmailStr
+from sqlalchemy.orm import Session
+
+from app.core.deps import get_current_active_superuser, get_current_active_user, get_db
+from app.models.user import User
+from app.schemas.user import User as UserSchema
+from app.schemas.user import UserCreate, UserUpdate
+from app.services import user as user_service
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[UserSchema])
+def read_users(
+    db: Session = Depends(get_db),
+    skip: int = 0,
+    limit: int = 100,
+    current_user: User = Depends(get_current_active_superuser),
+) -> Any:
+    """
+    Retrieve users.
+    """
+    users = db.query(User).offset(skip).limit(limit).all()
+    return users
+
+
+@router.post("/", response_model=UserSchema)
+def create_user(
+    *,
+    db: Session = Depends(get_db),
+    user_in: UserCreate,
+    current_user: User = Depends(get_current_active_superuser),
+) -> Any:
+    """
+    Create new user.
+    """
+    user = user_service.get_by_email(db, email=user_in.email)
+    if user:
+        raise HTTPException(
+            status_code=400,
+            detail="A user with this email already exists",
+        )
+    user = user_service.create(db, obj_in=user_in)
+    return user
+
+
+@router.put("/me", response_model=UserSchema)
+def update_user_me(
+    *,
+    db: Session = Depends(get_db),
+    password: str = Body(None),
+    full_name: str = Body(None),
+    email: EmailStr = Body(None),
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Update own user.
+    """
+    current_user_data = jsonable_encoder(current_user)
+    user_in = UserUpdate(**current_user_data)
+    if password is not None:
+        user_in.password = password
+    if full_name is not None:
+        user_in.full_name = full_name
+    if email is not None:
+        user_in.email = email
+    user = user_service.update(db, db_obj=current_user, obj_in=user_in)
+    return user
+
+
+@router.get("/me", response_model=UserSchema)
+def read_user_me(
+    current_user: User = Depends(get_current_active_user),
+) -> Any:
+    """
+    Get current user.
+    """
+    return current_user
+
+
+@router.get("/{user_id}", response_model=UserSchema)
+def read_user_by_id(
+    user_id: str,
+    current_user: User = Depends(get_current_active_user),
+    db: Session = Depends(get_db),
+) -> Any:
+    """
+    Get a specific user by id.
+    """
+    user = user_service.get_by_id(db, user_id=user_id)
+    if user == current_user:
+        return user
+    if not user_service.is_superuser(current_user):
+        raise HTTPException(
+            status_code=400, detail="The user doesn't have enough privileges"
+        )
+    return user
+
+
+@router.put("/{user_id}", response_model=UserSchema)
+def update_user(
+    *,
+    db: Session = Depends(get_db),
+    user_id: str,
+    user_in: UserUpdate,
+    current_user: User = Depends(get_current_active_superuser),
+) -> Any:
+    """
+    Update a user.
+    """
+    user = user_service.get_by_id(db, user_id=user_id)
+    if not user:
+        raise HTTPException(
+            status_code=404,
+            detail="The user with this id does not exist in the system",
+        )
+    user = user_service.update(db, db_obj=user, obj_in=user_in)
+    return user

app/core/config.py

@@ -0,0 +1,40 @@
+from typing import List
+from pydantic import AnyHttpUrl, field_validator
+from pydantic_settings import BaseSettings
+from pathlib import Path
+
+
+class Settings(BaseSettings):
+    PROJECT_NAME: str = "E-Commerce API"
+    VERSION: str = "0.1.0"
+    API_V1_STR: str = "/api/v1"
+    
+    # CORS Settings
+    CORS_ORIGINS: List[AnyHttpUrl] = []
+
+    @field_validator("CORS_ORIGINS", mode="before")
+    @classmethod
+    def validate_cors_origins(cls, v):
+        if isinstance(v, str) and not v.startswith("["):
+            return [i.strip() for i in v.split(",")]
+        elif isinstance(v, (list, str)):
+            return v
+        raise ValueError(v)
+
+    # JWT Settings
+    SECRET_KEY: str = "supersecretkey"  # Change in production
+    ALGORITHM: str = "HS256"
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30
+    
+    # Database Settings
+    DB_DIR: Path = Path("/app") / "storage" / "db"
+    
+    class Config:
+        env_file = ".env"
+        case_sensitive = True
+
+
+settings = Settings()
+
+# Ensure DB directory exists
+settings.DB_DIR.mkdir(parents=True, exist_ok=True)

app/core/deps.py

@@ -0,0 +1,53 @@
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from jose import jwt
+from pydantic import ValidationError
+from sqlalchemy.orm import Session
+
+from app.db.session import get_db
+from app.models.user import User
+from app.core.config import settings
+from app.schemas.token import TokenPayload
+
+oauth2_scheme = OAuth2PasswordBearer(
+    tokenUrl=f"{settings.API_V1_STR}/auth/login"
+)
+
+
+def get_current_user(
+    db: Session = Depends(get_db),
+    token: str = Depends(oauth2_scheme),
+) -> User:
+    try:
+        payload = jwt.decode(
+            token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM]
+        )
+        token_data = TokenPayload(**payload)
+    except (jwt.JWTError, ValidationError):
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Could not validate credentials",
+        )
+    user = db.query(User).filter(User.id == token_data.sub).first()
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+    return user
+
+
+def get_current_active_user(
+    current_user: User = Depends(get_current_user),
+) -> User:
+    if not current_user.is_active:
+        raise HTTPException(status_code=400, detail="Inactive user")
+    return current_user
+
+
+def get_current_active_superuser(
+    current_user: User = Depends(get_current_user),
+) -> User:
+    if not current_user.is_superuser:
+        raise HTTPException(
+            status_code=403, detail="The user doesn't have enough privileges"
+        )
+    return current_user

app/core/security.py

@@ -0,0 +1,38 @@
+from datetime import datetime, timedelta
+from typing import Any, Union
+
+from jose import jwt
+from passlib.context import CryptContext
+
+from app.core.config import settings
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+
+def create_access_token(subject: Union[str, Any], expires_delta: timedelta = None) -> str:
+    """
+    Create JWT access token
+    """
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(
+            minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES
+        )
+    to_encode = {"exp": expire, "sub": str(subject)}
+    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)
+    return encoded_jwt
+
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    """
+    Verify plain password against hashed password
+    """
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def get_password_hash(password: str) -> str:
+    """
+    Hash a password for storing
+    """
+    return pwd_context.hash(password)

app/db/base.py

@@ -0,0 +1,10 @@
+# Import all the models, so that Base has them before being
+# imported by Alembic
+from app.db.base_class import Base  # noqa
+from app.models.user import User  # noqa
+from app.models.product import Product  # noqa
+from app.models.category import Category  # noqa
+from app.models.order import Order  # noqa
+from app.models.order_item import OrderItem  # noqa
+from app.models.cart import Cart  # noqa
+from app.models.cart_item import CartItem  # noqa

app/db/base_class.py

@@ -0,0 +1,13 @@
+from typing import Any
+from sqlalchemy.ext.declarative import declared_attr
+from sqlalchemy.orm import DeclarativeBase
+
+
+class Base(DeclarativeBase):
+    id: Any
+    __name__: str
+    
+    # Generate __tablename__ automatically
+    @declared_attr
+    def __tablename__(cls) -> str:
+        return cls.__name__.lower()

app/db/init_db.py

@@ -0,0 +1,13 @@
+
+from app.db.base import Base
+from app.db.session import engine
+
+
+def init_db() -> None:
+    # Create tables if they don't exist
+    Base.metadata.create_all(bind=engine)
+
+
+def drop_db() -> None:
+    # Drop all tables
+    Base.metadata.drop_all(bind=engine)

app/db/session.py

@@ -0,0 +1,24 @@
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+from app.core.config import settings
+
+# Ensure DB directory exists
+settings.DB_DIR.mkdir(parents=True, exist_ok=True)
+
+SQLALCHEMY_DATABASE_URL = f"sqlite:///{settings.DB_DIR}/db.sqlite"
+
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL,
+    connect_args={"check_same_thread": False}
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()

app/models/__init__.py

@@ -0,0 +1,20 @@
+# Import all models
+from app.models.user import User  # noqa
+from app.models.category import Category  # noqa
+from app.models.product import Product  # noqa
+from app.models.order import Order, OrderStatus  # noqa
+from app.models.order_item import OrderItem  # noqa
+from app.models.cart import Cart  # noqa
+from app.models.cart_item import CartItem  # noqa
+
+# Define __all__ to specify what gets imported with `from app.models import *`
+__all__ = [
+    "User",
+    "Category",
+    "Product",
+    "Order",
+    "OrderStatus",
+    "OrderItem",
+    "Cart",
+    "CartItem",
+]

app/models/cart.py

@@ -0,0 +1,16 @@
+from datetime import datetime
+from sqlalchemy import Column, String, DateTime, ForeignKey
+from sqlalchemy.orm import relationship
+
+from app.db.base_class import Base
+
+
+class Cart(Base):
+    id = Column(String, primary_key=True, index=True)
+    user_id = Column(String, ForeignKey("user.id"), unique=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+    
+    # Relationships
+    user = relationship("User", back_populates="cart")
+    items = relationship("CartItem", back_populates="cart", cascade="all, delete-orphan")

app/models/cart_item.py

@@ -0,0 +1,21 @@
+from datetime import datetime
+from sqlalchemy import Column, String, Integer, DateTime, ForeignKey, UniqueConstraint
+from sqlalchemy.orm import relationship
+
+from app.db.base_class import Base
+
+
+class CartItem(Base):
+    id = Column(String, primary_key=True, index=True)
+    cart_id = Column(String, ForeignKey("cart.id"))
+    product_id = Column(String, ForeignKey("product.id"))
+    quantity = Column(Integer, nullable=False, default=1)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+    
+    # Ensure each product can only be in the cart once
+    __table_args__ = (UniqueConstraint('cart_id', 'product_id', name='_cart_product_uc'),)
+    
+    # Relationships
+    cart = relationship("Cart", back_populates="items")
+    product = relationship("Product", back_populates="cart_items")

app/models/category.py

@@ -0,0 +1,16 @@
+from datetime import datetime
+from sqlalchemy import Column, String, DateTime, Text
+from sqlalchemy.orm import relationship
+
+from app.db.base_class import Base
+
+
+class Category(Base):
+    id = Column(String, primary_key=True, index=True)
+    name = Column(String, index=True)
+    description = Column(Text, nullable=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+    
+    # Relationships
+    products = relationship("Product", back_populates="category")

app/models/order.py

@@ -0,0 +1,29 @@
+from datetime import datetime
+from sqlalchemy import Column, String, Float, DateTime, Text, ForeignKey
+from sqlalchemy.orm import relationship
+import enum
+
+from app.db.base_class import Base
+
+
+class OrderStatus(str, enum.Enum):
+    PENDING = "pending"
+    PAID = "paid"
+    SHIPPED = "shipped"
+    DELIVERED = "delivered"
+    CANCELLED = "cancelled"
+
+
+class Order(Base):
+    id = Column(String, primary_key=True, index=True)
+    user_id = Column(String, ForeignKey("user.id"))
+    status = Column(String, default=OrderStatus.PENDING)
+    total_amount = Column(Float, nullable=False, default=0.0)
+    shipping_address = Column(Text, nullable=True)
+    payment_id = Column(String, nullable=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+    
+    # Relationships
+    user = relationship("User", back_populates="orders")
+    items = relationship("OrderItem", back_populates="order", cascade="all, delete-orphan")

app/models/order_item.py

@@ -0,0 +1,19 @@
+from datetime import datetime
+from sqlalchemy import Column, String, Float, Integer, DateTime, ForeignKey
+from sqlalchemy.orm import relationship
+
+from app.db.base_class import Base
+
+
+class OrderItem(Base):
+    id = Column(String, primary_key=True, index=True)
+    order_id = Column(String, ForeignKey("order.id"))
+    product_id = Column(String, ForeignKey("product.id"))
+    quantity = Column(Integer, nullable=False, default=1)
+    price = Column(Float, nullable=False)  # Price at the time of purchase
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+    
+    # Relationships
+    order = relationship("Order", back_populates="items")
+    product = relationship("Product", back_populates="order_items")

app/models/product.py

@@ -0,0 +1,23 @@
+from datetime import datetime
+from sqlalchemy import Column, String, Float, Integer, DateTime, Text, ForeignKey, Boolean
+from sqlalchemy.orm import relationship
+
+from app.db.base_class import Base
+
+
+class Product(Base):
+    id = Column(String, primary_key=True, index=True)
+    name = Column(String, index=True)
+    description = Column(Text, nullable=True)
+    price = Column(Float, nullable=False)
+    stock = Column(Integer, nullable=False, default=0)
+    is_active = Column(Boolean, default=True)
+    category_id = Column(String, ForeignKey("category.id"))
+    image_url = Column(String, nullable=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+    
+    # Relationships
+    category = relationship("Category", back_populates="products")
+    order_items = relationship("OrderItem", back_populates="product")
+    cart_items = relationship("CartItem", back_populates="product")

app/models/user.py

@@ -0,0 +1,20 @@
+from datetime import datetime
+from sqlalchemy import Boolean, Column, String, DateTime
+from sqlalchemy.orm import relationship
+
+from app.db.base_class import Base
+
+
+class User(Base):
+    id = Column(String, primary_key=True, index=True)
+    email = Column(String, unique=True, index=True)
+    hashed_password = Column(String)
+    full_name = Column(String, index=True)
+    is_active = Column(Boolean, default=True)
+    is_superuser = Column(Boolean, default=False)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+    
+    # Relationships
+    orders = relationship("Order", back_populates="user", cascade="all, delete-orphan")
+    cart = relationship("Cart", back_populates="user", uselist=False, cascade="all, delete-orphan")

app/schemas/__init__.py

@@ -0,0 +1,17 @@
+# Import all schema models
+from app.schemas.token import Token, TokenPayload  # noqa
+from app.schemas.user import User, UserCreate, UserInDB, UserUpdate  # noqa
+from app.schemas.category import Category, CategoryCreate, CategoryUpdate  # noqa
+from app.schemas.product import Product, ProductCreate, ProductUpdate, ProductList  # noqa
+from app.schemas.cart import Cart, CartCreate, CartUpdate, CartItem, CartItemCreate, CartItemUpdate  # noqa
+from app.schemas.order import Order, OrderCreate, OrderUpdate, OrderItem, OrderItemCreate, OrderList  # noqa
+
+# Define __all__ to specify what gets imported with `from app.schemas import *`
+__all__ = [
+    "Token", "TokenPayload",
+    "User", "UserCreate", "UserInDB", "UserUpdate",
+    "Category", "CategoryCreate", "CategoryUpdate",
+    "Product", "ProductCreate", "ProductUpdate", "ProductList",
+    "Cart", "CartCreate", "CartUpdate", "CartItem", "CartItemCreate", "CartItemUpdate",
+    "Order", "OrderCreate", "OrderUpdate", "OrderItem", "OrderItemCreate", "OrderList",
+]

app/schemas/cart.py

@@ -0,0 +1,56 @@
+from typing import List
+from datetime import datetime
+from pydantic import BaseModel, Field
+
+
+class CartItemBase(BaseModel):
+    product_id: str
+    quantity: int = Field(..., gt=0)
+
+
+class CartItemCreate(CartItemBase):
+    pass
+
+
+class CartItemUpdate(BaseModel):
+    quantity: int = Field(..., gt=0)
+
+
+class CartItemInDBBase(CartItemBase):
+    id: str
+    cart_id: str
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        orm_mode = True
+
+
+class CartItem(CartItemInDBBase):
+    pass
+
+
+class CartBase(BaseModel):
+    pass
+
+
+class CartCreate(CartBase):
+    user_id: str
+
+
+class CartUpdate(CartBase):
+    pass
+
+
+class CartInDBBase(CartBase):
+    id: str
+    user_id: str
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        orm_mode = True
+
+
+class Cart(CartInDBBase):
+    items: List[CartItem] = []

app/schemas/category.py

@@ -0,0 +1,33 @@
+from typing import Optional
+from datetime import datetime
+from pydantic import BaseModel
+
+
+# Shared properties
+class CategoryBase(BaseModel):
+    name: str
+    description: Optional[str] = None
+
+
+# Properties to receive via API on creation
+class CategoryCreate(CategoryBase):
+    pass
+
+
+# Properties to receive via API on update
+class CategoryUpdate(CategoryBase):
+    name: Optional[str] = None
+
+
+class CategoryInDBBase(CategoryBase):
+    id: str
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        orm_mode = True
+
+
+# Additional properties to return via API
+class Category(CategoryInDBBase):
+    pass

app/schemas/order.py

@@ -0,0 +1,70 @@
+from typing import List, Optional
+from datetime import datetime
+from pydantic import BaseModel, Field
+
+from app.models.order import OrderStatus
+
+
+class OrderItemBase(BaseModel):
+    product_id: str
+    quantity: int = Field(..., gt=0)
+    price: float = Field(..., gt=0)
+
+
+class OrderItemCreate(OrderItemBase):
+    pass
+
+
+class OrderItemInDBBase(OrderItemBase):
+    id: str
+    order_id: str
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        orm_mode = True
+
+
+class OrderItem(OrderItemInDBBase):
+    pass
+
+
+class OrderBase(BaseModel):
+    shipping_address: Optional[str] = None
+
+
+class OrderCreate(OrderBase):
+    user_id: str
+
+
+class OrderUpdate(BaseModel):
+    status: Optional[OrderStatus] = None
+    shipping_address: Optional[str] = None
+    payment_id: Optional[str] = None
+
+
+class OrderInDBBase(OrderBase):
+    id: str
+    user_id: str
+    status: OrderStatus
+    total_amount: float
+    payment_id: Optional[str] = None
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        orm_mode = True
+
+
+class Order(OrderInDBBase):
+    items: List[OrderItem] = []
+
+
+class OrderList(BaseModel):
+    id: str
+    status: OrderStatus
+    total_amount: float
+    created_at: datetime
+
+    class Config:
+        orm_mode = True

app/schemas/product.py

@@ -0,0 +1,57 @@
+from typing import Optional
+from datetime import datetime
+from pydantic import BaseModel, Field
+
+
+# Shared properties
+class ProductBase(BaseModel):
+    name: str
+    description: Optional[str] = None
+    price: float = Field(..., gt=0)
+    stock: int = Field(..., ge=0)
+    is_active: bool = True
+    category_id: str
+    image_url: Optional[str] = None
+
+
+# Properties to receive via API on creation
+class ProductCreate(ProductBase):
+    pass
+
+
+# Properties to receive via API on update
+class ProductUpdate(ProductBase):
+    name: Optional[str] = None
+    description: Optional[str] = None
+    price: Optional[float] = None
+    stock: Optional[int] = None
+    is_active: Optional[bool] = None
+    category_id: Optional[str] = None
+    image_url: Optional[str] = None
+
+
+class ProductInDBBase(ProductBase):
+    id: str
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        orm_mode = True
+
+
+# Additional properties to return via API
+class Product(ProductInDBBase):
+    pass
+
+
+# Product with minimal data for list views
+class ProductList(BaseModel):
+    id: str
+    name: str
+    price: float
+    image_url: Optional[str] = None
+    category_id: str
+    is_active: bool
+
+    class Config:
+        orm_mode = True

app/schemas/token.py

@@ -0,0 +1,11 @@
+from typing import Optional
+from pydantic import BaseModel
+
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str
+
+
+class TokenPayload(BaseModel):
+    sub: Optional[str] = None

app/schemas/user.py

@@ -0,0 +1,41 @@
+from typing import Optional
+from datetime import datetime
+from pydantic import BaseModel, EmailStr
+
+
+# Shared properties
+class UserBase(BaseModel):
+    email: Optional[EmailStr] = None
+    full_name: Optional[str] = None
+    is_active: Optional[bool] = True
+    is_superuser: bool = False
+
+
+# Properties to receive via API on creation
+class UserCreate(UserBase):
+    email: EmailStr
+    password: str
+
+
+# Properties to receive via API on update
+class UserUpdate(UserBase):
+    password: Optional[str] = None
+
+
+class UserInDBBase(UserBase):
+    id: str
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        orm_mode = True
+
+
+# Additional properties to return via API
+class User(UserInDBBase):
+    pass
+
+
+# Additional properties stored in DB
+class UserInDB(UserInDBBase):
+    hashed_password: str

app/services/cart.py

@@ -0,0 +1,104 @@
+import uuid
+from typing import List, Optional
+
+from sqlalchemy.orm import Session
+
+from app.models.cart import Cart
+from app.models.cart_item import CartItem
+from app.models.product import Product
+from app.schemas.cart import CartCreate, CartItemCreate, CartItemUpdate
+
+
+def get_by_user_id(db: Session, user_id: str) -> Optional[Cart]:
+    return db.query(Cart).filter(Cart.user_id == user_id).first()
+
+
+def get_cart_items(db: Session, cart_id: str) -> List[CartItem]:
+    return db.query(CartItem).filter(CartItem.cart_id == cart_id).all()
+
+
+def create_cart(db: Session, *, obj_in: CartCreate) -> Cart:
+    db_obj = Cart(
+        id=str(uuid.uuid4()),
+        user_id=obj_in.user_id,
+    )
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj
+
+
+def ensure_cart_exists(db: Session, user_id: str) -> Cart:
+    cart = get_by_user_id(db, user_id=user_id)
+    if not cart:
+        cart_in = CartCreate(user_id=user_id)
+        cart = create_cart(db, obj_in=cart_in)
+    return cart
+
+
+def add_to_cart(db: Session, *, cart_id: str, obj_in: CartItemCreate) -> CartItem:
+    # Check if item already exists in cart
+    cart_item = db.query(CartItem).filter(
+        CartItem.cart_id == cart_id,
+        CartItem.product_id == obj_in.product_id
+    ).first()
+    
+    if cart_item:
+        # Update quantity if item already exists
+        cart_item.quantity += obj_in.quantity
+        db.add(cart_item)
+        db.commit()
+        db.refresh(cart_item)
+        return cart_item
+    
+    # Create new cart item
+    db_obj = CartItem(
+        id=str(uuid.uuid4()),
+        cart_id=cart_id,
+        product_id=obj_in.product_id,
+        quantity=obj_in.quantity,
+    )
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj
+
+
+def update_cart_item(db: Session, *, item_id: str, obj_in: CartItemUpdate) -> Optional[CartItem]:
+    cart_item = db.query(CartItem).filter(CartItem.id == item_id).first()
+    if not cart_item:
+        return None
+    
+    cart_item.quantity = obj_in.quantity
+    db.add(cart_item)
+    db.commit()
+    db.refresh(cart_item)
+    return cart_item
+
+
+def remove_from_cart(db: Session, *, item_id: str) -> Optional[CartItem]:
+    cart_item = db.query(CartItem).filter(CartItem.id == item_id).first()
+    if not cart_item:
+        return None
+    
+    db.delete(cart_item)
+    db.commit()
+    return cart_item
+
+
+def clear_cart(db: Session, *, cart_id: str) -> None:
+    db.query(CartItem).filter(CartItem.cart_id == cart_id).delete()
+    db.commit()
+    return None
+
+
+def calculate_cart_total(db: Session, *, cart_id: str) -> float:
+    cart_items = get_cart_items(db, cart_id=cart_id)
+    total = 0.0
+    
+    for item in cart_items:
+        product = db.query(Product).filter(Product.id == item.product_id).first()
+        if product:
+            total += product.price * item.quantity
+    
+    return total

app/services/category.py

@@ -0,0 +1,50 @@
+import uuid
+from typing import List, Optional
+
+from sqlalchemy.orm import Session
+
+from app.models.category import Category
+from app.schemas.category import CategoryCreate, CategoryUpdate
+
+
+def get_by_id(db: Session, category_id: str) -> Optional[Category]:
+    return db.query(Category).filter(Category.id == category_id).first()
+
+
+def get_by_name(db: Session, name: str) -> Optional[Category]:
+    return db.query(Category).filter(Category.name == name).first()
+
+
+def get_multi(db: Session, *, skip: int = 0, limit: int = 100) -> List[Category]:
+    return db.query(Category).offset(skip).limit(limit).all()
+
+
+def create(db: Session, *, obj_in: CategoryCreate) -> Category:
+    db_obj = Category(
+        id=str(uuid.uuid4()),
+        name=obj_in.name,
+        description=obj_in.description,
+    )
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj
+
+
+def update(db: Session, *, db_obj: Category, obj_in: CategoryUpdate) -> Category:
+    update_data = obj_in.dict(exclude_unset=True)
+    
+    for field, value in update_data.items():
+        setattr(db_obj, field, value)
+    
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj
+
+
+def delete(db: Session, *, category_id: str) -> Category:
+    obj = db.query(Category).get(category_id)
+    db.delete(obj)
+    db.commit()
+    return obj

app/services/order.py

@@ -0,0 +1,94 @@
+import uuid
+from typing import List, Optional
+
+from sqlalchemy.orm import Session
+
+from app.models.order import Order, OrderStatus
+from app.models.order_item import OrderItem
+from app.models.product import Product
+from app.schemas.order import OrderCreate, OrderUpdate, OrderItemCreate
+
+
+def get_by_id(db: Session, order_id: str) -> Optional[Order]:
+    return db.query(Order).filter(Order.id == order_id).first()
+
+
+def get_by_user_id(db: Session, user_id: str, skip: int = 0, limit: int = 100) -> List[Order]:
+    return db.query(Order).filter(Order.user_id == user_id).order_by(Order.created_at.desc()).offset(skip).limit(limit).all()
+
+
+def get_order_items(db: Session, order_id: str) -> List[OrderItem]:
+    return db.query(OrderItem).filter(OrderItem.order_id == order_id).all()
+
+
+def create(db: Session, *, obj_in: OrderCreate, items: List[OrderItemCreate]) -> Order:
+    # Calculate total amount
+    total_amount = 0.0
+    for item in items:
+        total_amount += item.price * item.quantity
+    
+    # Create order
+    db_obj = Order(
+        id=str(uuid.uuid4()),
+        user_id=obj_in.user_id,
+        status=OrderStatus.PENDING,
+        total_amount=total_amount,
+        shipping_address=obj_in.shipping_address,
+    )
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    
+    # Create order items
+    for item in items:
+        order_item = OrderItem(
+            id=str(uuid.uuid4()),
+            order_id=db_obj.id,
+            product_id=item.product_id,
+            quantity=item.quantity,
+            price=item.price,
+        )
+        db.add(order_item)
+        
+        # Update product stock
+        product = db.query(Product).filter(Product.id == item.product_id).first()
+        if product:
+            product.stock -= item.quantity
+            db.add(product)
+    
+    db.commit()
+    return db_obj
+
+
+def update(db: Session, *, db_obj: Order, obj_in: OrderUpdate) -> Order:
+    update_data = obj_in.dict(exclude_unset=True)
+    
+    for field, value in update_data.items():
+        setattr(db_obj, field, value)
+    
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj
+
+
+def cancel_order(db: Session, *, order_id: str) -> Order:
+    order = get_by_id(db, order_id=order_id)
+    if not order or order.status != OrderStatus.PENDING:
+        return None
+    
+    # Update order status
+    order.status = OrderStatus.CANCELLED
+    db.add(order)
+    
+    # Restore product stock
+    order_items = get_order_items(db, order_id=order.id)
+    for item in order_items:
+        product = db.query(Product).filter(Product.id == item.product_id).first()
+        if product:
+            product.stock += item.quantity
+            db.add(product)
+    
+    db.commit()
+    db.refresh(order)
+    return order

app/services/product.py

@@ -0,0 +1,60 @@
+import uuid
+from typing import List, Optional
+
+from sqlalchemy.orm import Session
+
+from app.models.product import Product
+from app.schemas.product import ProductCreate, ProductUpdate
+
+
+def get_by_id(db: Session, product_id: str) -> Optional[Product]:
+    return db.query(Product).filter(Product.id == product_id).first()
+
+
+def get_multi(db: Session, *, skip: int = 0, limit: int = 100) -> List[Product]:
+    return db.query(Product).filter(Product.is_active).offset(skip).limit(limit).all()
+
+
+def get_by_category(db: Session, *, category_id: str, skip: int = 0, limit: int = 100) -> List[Product]:
+    return db.query(Product).filter(
+        Product.category_id == category_id,
+        Product.is_active
+    ).offset(skip).limit(limit).all()
+
+
+def create(db: Session, *, obj_in: ProductCreate) -> Product:
+    db_obj = Product(
+        id=str(uuid.uuid4()),
+        name=obj_in.name,
+        description=obj_in.description,
+        price=obj_in.price,
+        stock=obj_in.stock,
+        is_active=obj_in.is_active,
+        category_id=obj_in.category_id,
+        image_url=obj_in.image_url,
+    )
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj
+
+
+def update(db: Session, *, db_obj: Product, obj_in: ProductUpdate) -> Product:
+    update_data = obj_in.dict(exclude_unset=True)
+    
+    for field, value in update_data.items():
+        setattr(db_obj, field, value)
+    
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj
+
+
+def delete(db: Session, *, product_id: str) -> Product:
+    obj = db.query(Product).get(product_id)
+    obj.is_active = False
+    db.add(obj)
+    db.commit()
+    db.refresh(obj)
+    return obj

app/services/user.py

@@ -0,0 +1,63 @@
+import uuid
+from typing import Optional
+
+from sqlalchemy.orm import Session
+
+from app.core.security import get_password_hash, verify_password
+from app.models.user import User
+from app.schemas.user import UserCreate, UserUpdate
+
+
+def get_by_id(db: Session, user_id: str) -> Optional[User]:
+    return db.query(User).filter(User.id == user_id).first()
+
+
+def get_by_email(db: Session, email: str) -> Optional[User]:
+    return db.query(User).filter(User.email == email).first()
+
+
+def create(db: Session, *, obj_in: UserCreate) -> User:
+    db_obj = User(
+        id=str(uuid.uuid4()),
+        email=obj_in.email,
+        hashed_password=get_password_hash(obj_in.password),
+        full_name=obj_in.full_name,
+        is_superuser=obj_in.is_superuser,
+    )
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj
+
+
+def update(db: Session, *, db_obj: User, obj_in: UserUpdate) -> User:
+    update_data = obj_in.dict(exclude_unset=True)
+    if update_data.get("password"):
+        hashed_password = get_password_hash(update_data["password"])
+        del update_data["password"]
+        update_data["hashed_password"] = hashed_password
+    
+    for field, value in update_data.items():
+        setattr(db_obj, field, value)
+    
+    db.add(db_obj)
+    db.commit()
+    db.refresh(db_obj)
+    return db_obj
+
+
+def authenticate(db: Session, *, email: str, password: str) -> Optional[User]:
+    user = get_by_email(db, email=email)
+    if not user:
+        return None
+    if not verify_password(password, user.hashed_password):
+        return None
+    return user
+
+
+def is_active(user: User) -> bool:
+    return user.is_active
+
+
+def is_superuser(user: User) -> bool:
+    return user.is_superuser

main.py

@@ -0,0 +1,35 @@
+import uvicorn
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from app.api.api import api_router
+from app.core.config import settings
+
+app = FastAPI(
+    title=settings.PROJECT_NAME,
+    version=settings.VERSION,
+    description="E-commerce API with FastAPI",
+    openapi_url=f"{settings.API_V1_STR}/openapi.json",
+    docs_url="/docs",
+    redoc_url="/redoc",
+)
+
+# Set CORS middleware
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=settings.CORS_ORIGINS,
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Include API router
+app.include_router(api_router, prefix=settings.API_V1_STR)
+
+# Health check endpoint
+@app.get("/health", tags=["Health"])
+async def health_check():
+    return {"status": "healthy"}
+
+if __name__ == "__main__":
+    uvicorn.run("main:app", host="0.0.0.0", port=8000, reload=True)

migrations/README

@@ -0,0 +1,15 @@
+Generic single-database configuration with SQLAlchemy.
+
+This directory contains Alembic migration scripts for the e-commerce application database.
+
+To create a new migration script:
+$ alembic revision --autogenerate -m "Description of the changes"
+
+To apply all migration scripts to the database:
+$ alembic upgrade head
+
+To downgrade to a specific revision:
+$ alembic downgrade <revision_id>
+
+To get the current revision:
+$ alembic current

migrations/env.py

@@ -0,0 +1,84 @@
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+# Import Base model
+from app.db.base import Base
+
+# This is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+target_metadata = Base.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        is_sqlite = connection.dialect.name == 'sqlite'
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            render_as_batch=is_sqlite,
+            compare_type=True,
+            compare_server_default=True,
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

migrations/script.py.mako

@@ -0,0 +1,24 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}

migrations/versions/1a2b3c4d5e6f_initial_tables.py

@@ -0,0 +1,156 @@
+"""Initial tables
+
+Revision ID: 1a2b3c4d5e6f
+Revises: 
+Create Date: 2023-11-16 00:00:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '1a2b3c4d5e6f'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # Create user table
+    op.create_table(
+        'user',
+        sa.Column('id', sa.String(), nullable=False),
+        sa.Column('email', sa.String(), nullable=True),
+        sa.Column('hashed_password', sa.String(), nullable=True),
+        sa.Column('full_name', sa.String(), nullable=True),
+        sa.Column('is_active', sa.Boolean(), nullable=True),
+        sa.Column('is_superuser', sa.Boolean(), nullable=True),
+        sa.Column('created_at', sa.DateTime(), nullable=True),
+        sa.Column('updated_at', sa.DateTime(), nullable=True),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_user_email'), 'user', ['email'], unique=True)
+    op.create_index(op.f('ix_user_full_name'), 'user', ['full_name'], unique=False)
+    op.create_index(op.f('ix_user_id'), 'user', ['id'], unique=False)
+    
+    # Create category table
+    op.create_table(
+        'category',
+        sa.Column('id', sa.String(), nullable=False),
+        sa.Column('name', sa.String(), nullable=True),
+        sa.Column('description', sa.Text(), nullable=True),
+        sa.Column('created_at', sa.DateTime(), nullable=True),
+        sa.Column('updated_at', sa.DateTime(), nullable=True),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_category_id'), 'category', ['id'], unique=False)
+    op.create_index(op.f('ix_category_name'), 'category', ['name'], unique=False)
+    
+    # Create product table
+    op.create_table(
+        'product',
+        sa.Column('id', sa.String(), nullable=False),
+        sa.Column('name', sa.String(), nullable=True),
+        sa.Column('description', sa.Text(), nullable=True),
+        sa.Column('price', sa.Float(), nullable=False),
+        sa.Column('stock', sa.Integer(), nullable=False),
+        sa.Column('is_active', sa.Boolean(), nullable=True),
+        sa.Column('category_id', sa.String(), nullable=True),
+        sa.Column('image_url', sa.String(), nullable=True),
+        sa.Column('created_at', sa.DateTime(), nullable=True),
+        sa.Column('updated_at', sa.DateTime(), nullable=True),
+        sa.ForeignKeyConstraint(['category_id'], ['category.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_product_id'), 'product', ['id'], unique=False)
+    op.create_index(op.f('ix_product_name'), 'product', ['name'], unique=False)
+    
+    # Create cart table
+    op.create_table(
+        'cart',
+        sa.Column('id', sa.String(), nullable=False),
+        sa.Column('user_id', sa.String(), nullable=True),
+        sa.Column('created_at', sa.DateTime(), nullable=True),
+        sa.Column('updated_at', sa.DateTime(), nullable=True),
+        sa.ForeignKeyConstraint(['user_id'], ['user.id'], ),
+        sa.PrimaryKeyConstraint('id'),
+        sa.UniqueConstraint('user_id')
+    )
+    op.create_index(op.f('ix_cart_id'), 'cart', ['id'], unique=False)
+    
+    # Create order table
+    op.create_table(
+        'order',
+        sa.Column('id', sa.String(), nullable=False),
+        sa.Column('user_id', sa.String(), nullable=True),
+        sa.Column('status', sa.String(), nullable=True),
+        sa.Column('total_amount', sa.Float(), nullable=False),
+        sa.Column('shipping_address', sa.Text(), nullable=True),
+        sa.Column('payment_id', sa.String(), nullable=True),
+        sa.Column('created_at', sa.DateTime(), nullable=True),
+        sa.Column('updated_at', sa.DateTime(), nullable=True),
+        sa.ForeignKeyConstraint(['user_id'], ['user.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_order_id'), 'order', ['id'], unique=False)
+    
+    # Create order_item table
+    op.create_table(
+        'order_item',
+        sa.Column('id', sa.String(), nullable=False),
+        sa.Column('order_id', sa.String(), nullable=True),
+        sa.Column('product_id', sa.String(), nullable=True),
+        sa.Column('quantity', sa.Integer(), nullable=False),
+        sa.Column('price', sa.Float(), nullable=False),
+        sa.Column('created_at', sa.DateTime(), nullable=True),
+        sa.Column('updated_at', sa.DateTime(), nullable=True),
+        sa.ForeignKeyConstraint(['order_id'], ['order.id'], ),
+        sa.ForeignKeyConstraint(['product_id'], ['product.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_order_item_id'), 'order_item', ['id'], unique=False)
+    
+    # Create cart_item table
+    op.create_table(
+        'cart_item',
+        sa.Column('id', sa.String(), nullable=False),
+        sa.Column('cart_id', sa.String(), nullable=True),
+        sa.Column('product_id', sa.String(), nullable=True),
+        sa.Column('quantity', sa.Integer(), nullable=False),
+        sa.Column('created_at', sa.DateTime(), nullable=True),
+        sa.Column('updated_at', sa.DateTime(), nullable=True),
+        sa.ForeignKeyConstraint(['cart_id'], ['cart.id'], ),
+        sa.ForeignKeyConstraint(['product_id'], ['product.id'], ),
+        sa.PrimaryKeyConstraint('id'),
+        sa.UniqueConstraint('cart_id', 'product_id', name='_cart_product_uc')
+    )
+    op.create_index(op.f('ix_cart_item_id'), 'cart_item', ['id'], unique=False)
+
+
+def downgrade() -> None:
+    # Drop all tables in reverse order
+    op.drop_index(op.f('ix_cart_item_id'), table_name='cart_item')
+    op.drop_table('cart_item')
+    
+    op.drop_index(op.f('ix_order_item_id'), table_name='order_item')
+    op.drop_table('order_item')
+    
+    op.drop_index(op.f('ix_order_id'), table_name='order')
+    op.drop_table('order')
+    
+    op.drop_index(op.f('ix_cart_id'), table_name='cart')
+    op.drop_table('cart')
+    
+    op.drop_index(op.f('ix_product_name'), table_name='product')
+    op.drop_index(op.f('ix_product_id'), table_name='product')
+    op.drop_table('product')
+    
+    op.drop_index(op.f('ix_category_name'), table_name='category')
+    op.drop_index(op.f('ix_category_id'), table_name='category')
+    op.drop_table('category')
+    
+    op.drop_index(op.f('ix_user_id'), table_name='user')
+    op.drop_index(op.f('ix_user_full_name'), table_name='user')
+    op.drop_index(op.f('ix_user_email'), table_name='user')
+    op.drop_table('user')

requirements.txt

@@ -0,0 +1,14 @@
+fastapi==0.104.1
+pydantic==2.4.2
+pydantic-settings==2.0.3
+python-multipart==0.0.6
+python-jose[cryptography]==3.3.0
+passlib[bcrypt]==1.7.4
+sqlalchemy==2.0.23
+alembic==1.12.1
+uvicorn==0.24.0
+ruff==0.1.5
+email-validator==2.1.0
+pytest==7.4.3
+httpx==0.25.1
+python-dotenv==1.0.0