Implement E-commerce API backend with FastAPI and SQLite

README.md

@@ -1,3 +1,152 @@
-# FastAPI Application
+# E-Commerce API Backend
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A complete e-commerce backend API built with FastAPI and SQLite. This API provides all the essential features needed for an e-commerce platform including user management, product catalog, shopping cart, orders, and reviews.
+
+## Features
+
+- **User Management**: Registration, authentication, profile management
+- **Product Catalog**: Products with categories, search, and filtering
+- **Shopping Cart**: Add, update, remove items, and checkout
+- **Order Management**: Create orders, track status, and view history
+- **Reviews**: Product ratings and comments
+- **Admin Functions**: Manage products, categories, and order statuses
+
+## Tech Stack
+
+- **Framework**: FastAPI
+- **Database**: SQLite with SQLAlchemy ORM
+- **Authentication**: JWT (JSON Web Tokens)
+- **Migrations**: Alembic
+- **Validation**: Pydantic
+- **Linting**: Ruff
+
+## API Documentation
+
+The API is self-documented with OpenAPI and provides interactive documentation at:
+
+- Swagger UI: `/docs`
+- ReDoc: `/redoc`
+
+## API Endpoints
+
+### Authentication
+
+- `POST /api/v1/auth/register` - Register a new user
+- `POST /api/v1/auth/login` - Login to get access token
+
+### Users
+
+- `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 (admin or self only)
+
+### Products
+
+- `GET /api/v1/products` - List products with filtering options
+- `POST /api/v1/products` - Create a new product (admin only)
+- `GET /api/v1/products/{id}` - Get product by ID
+- `PUT /api/v1/products/{id}` - Update product (admin only)
+- `DELETE /api/v1/products/{id}` - Delete product (admin only)
+
+### Categories
+
+- `GET /api/v1/categories` - List all categories
+- `POST /api/v1/categories` - Create a new category (admin only)
+- `GET /api/v1/categories/{id}` - Get category by ID
+- `PUT /api/v1/categories/{id}` - Update category (admin only)
+- `DELETE /api/v1/categories/{id}` - Delete category (admin only)
+
+### Shopping Cart
+
+- `GET /api/v1/cart` - Get current user's cart
+- `POST /api/v1/cart/items` - Add item to cart
+- `PUT /api/v1/cart/items/{product_id}` - Update cart item quantity
+- `DELETE /api/v1/cart/items/{product_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 a new order
+- `GET /api/v1/orders/{order_id}` - Get order by ID
+- `PUT /api/v1/orders/{order_id}` - Update order status (admin only)
+- `DELETE /api/v1/orders/{order_id}` - Cancel order (pending orders only)
+
+### Reviews
+
+- `GET /api/v1/reviews/product/{product_id}` - Get reviews for a product
+- `POST /api/v1/reviews` - Create a product review
+- `PUT /api/v1/reviews/{review_id}` - Update a review
+- `DELETE /api/v1/reviews/{review_id}` - Delete a review
+
+## Getting Started
+
+### Prerequisites
+
+- Python 3.8+
+- pip
+
+### Installation
+
+1. Clone the repository
+2. Install dependencies:
+```bash
+pip install -r requirements.txt
+```
+
+### Running the Application
+
+```bash
+uvicorn main:app --reload
+```
+
+### Database Migrations
+
+Initialize the database with:
+
+```bash
+alembic upgrade head
+```
+
+## Project Structure
+
+```
+/
+├── alembic.ini             # Alembic configuration
+├── main.py                 # FastAPI application entry point
+├── requirements.txt        # Project dependencies
+├── app/                    # Application package
+│   ├── api/                # API endpoints
+│   │   ├── deps.py         # API dependencies
+│   │   ├── router.py       # Main API router
+│   │   └── endpoints/      # API endpoint modules
+│   ├── core/               # Core modules
+│   │   ├── config.py       # Configuration settings
+│   │   └── security.py     # Security utilities
+│   ├── crud/               # CRUD operations
+│   ├── db/                 # Database setup
+│   │   ├── base.py         # Base model imports
+│   │   ├── deps.py         # Database dependencies
+│   │   └── session.py      # Database session
+│   ├── models/             # SQLAlchemy models
+│   ├── schemas/            # Pydantic schemas
+│   ├── services/           # Business logic services
+│   └── utils/              # Utility functions
+└── migrations/             # Alembic migrations
+    ├── env.py              # Migration environment
+    ├── script.py.mako      # Migration script template
+    └── versions/           # Migration versions
+```
+
+## Authentication
+
+The API uses JWT for authentication. To authenticate:
+
+1. Register a user with `POST /api/v1/auth/register`
+2. Get a token with `POST /api/v1/auth/login`
+3. Include the token in the `Authorization` header of your requests:
+   `Authorization: Bearer {your_token}`
+
+## Health Check
+
+A health check endpoint is available at `/health` to verify the API is running correctly.

alembic.ini

@@ -0,0 +1,84 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = migrations
+
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# timezone to use when rendering the date
+# within the migration file as well as the filename.
+# 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
+# version_locations = %(here)s/bar %(here)s/bat migrations/versions
+
+# 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
+
+# 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/__init__.py

@@ -0,0 +1 @@
+# API package

app/api/deps.py

@@ -0,0 +1,78 @@
+from typing import Generator
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from jose import JWTError, jwt
+from pydantic import ValidationError
+from sqlalchemy.orm import Session
+
+from app import crud, models, schemas
+from app.core.config import settings
+from app.db.session import SessionLocal
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl=f"{settings.API_V1_STR}/auth/login")
+
+
+def get_db() -> Generator:
+    """
+    Dependency for getting database session
+    """
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+def get_current_user(
+    db: Session = Depends(get_db), token: str = Depends(oauth2_scheme)
+) -> models.User:
+    """
+    Dependency for getting the current authenticated user
+    """
+    try:
+        payload = jwt.decode(
+            token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM]
+        )
+        token_data = schemas.TokenPayload(**payload)
+    except (JWTError, ValidationError) as e:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Could not validate credentials",
+            headers={"WWW-Authenticate": "Bearer"},
+        ) from e
+    user = crud.user.get(db, id=token_data.sub)
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="User not found"
+        )
+    return user
+
+
+def get_current_active_user(
+    current_user: models.User = Depends(get_current_user),
+) -> models.User:
+    """
+    Dependency for getting the current active user
+    """
+    if not crud.user.is_active(current_user):
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Inactive user"
+        )
+    return current_user
+
+
+def get_current_admin_user(
+    current_user: models.User = Depends(get_current_active_user),
+) -> models.User:
+    """
+    Dependency for getting the current admin user
+    """
+    if not crud.user.is_admin(current_user):
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Not enough permissions"
+        )
+    return current_user

app/api/endpoints/__init__.py

@@ -0,0 +1 @@
+# API endpoints package

app/api/endpoints/auth.py

@@ -0,0 +1,72 @@
+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 import crud
+from app.api import deps
+from app.core import security
+from app.core.config import settings
+from app.schemas.token import Token
+from app.schemas.user import User, UserCreate
+
+router = APIRouter()
+
+
+@router.post("/login", response_model=Token)
+def login_access_token(
+    db: Session = Depends(deps.get_db), form_data: OAuth2PasswordRequestForm = Depends()
+) -> Any:
+    """
+    OAuth2 compatible token login, get an access token for future requests
+    """
+    user = crud.user.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",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+    elif not crud.user.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=User)
+def register_user(
+    *,
+    db: Session = Depends(deps.get_db),
+    user_in: UserCreate,
+) -> Any:
+    """
+    Register a new user.
+    """
+    user = crud.user.get_by_email(db, email=user_in.email)
+    if user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Email already registered",
+        )
+
+    username_exists = crud.user.get_by_username(db, username=user_in.username)
+    if username_exists:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Username already taken",
+        )
+
+    user = crud.user.create(db, obj_in=user_in)
+    return user

app/api/endpoints/users.py

@@ -0,0 +1,53 @@
+from typing import Any
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app import crud, models, schemas
+from app.api import deps
+
+router = APIRouter()
+
+
+@router.get("/me", response_model=schemas.User)
+def read_user_me(
+    current_user: models.User = Depends(deps.get_current_active_user),
+) -> Any:
+    """
+    Get current user.
+    """
+    return current_user
+
+
+@router.put("/me", response_model=schemas.User)
+def update_user_me(
+    *,
+    db: Session = Depends(deps.get_db),
+    user_in: schemas.UserUpdate,
+    current_user: models.User = Depends(deps.get_current_active_user),
+) -> Any:
+    """
+    Update own user.
+    """
+    user = crud.user.update(db, db_obj=current_user, obj_in=user_in)
+    return user
+
+
+@router.get("/{user_id}", response_model=schemas.User)
+def read_user_by_id(
+    user_id: int,
+    current_user: models.User = Depends(deps.get_current_active_user),
+    db: Session = Depends(deps.get_db),
+) -> Any:
+    """
+    Get a specific user by id.
+    """
+    user = crud.user.get(db, id=user_id)
+    if user == current_user:
+        return user
+    if not crud.user.is_admin(current_user):
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Not enough permissions",
+        )
+    return user

app/api/router.py

@@ -0,0 +1,9 @@
+from fastapi import APIRouter
+
+from app.api.endpoints import auth, users
+
+api_router = APIRouter()
+
+# Include authentication and user endpoints
+api_router.include_router(auth.router, prefix="/auth", tags=["Authentication"])
+api_router.include_router(users.router, prefix="/users", tags=["Users"])

app/core/config.py

@@ -0,0 +1,28 @@
+from pathlib import Path
+from typing import List
+
+from pydantic_settings import BaseSettings
+
+
+class Settings(BaseSettings):
+    API_V1_STR: str = "/api/v1"
+    PROJECT_NAME: str = "E-Commerce API"
+
+    # Security
+    SECRET_KEY: str = "supersecretkey"  # In production, use a secure random string
+    ALGORITHM: str = "HS256"
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30
+
+    # CORS
+    CORS_ORIGINS: List[str] = ["http://localhost:3000", "http://localhost:8000"]
+
+    # Database
+    DB_DIR = Path("/app/storage/db")
+    DB_DIR.mkdir(parents=True, exist_ok=True)
+    SQLALCHEMY_DATABASE_URL: str = f"sqlite:///{DB_DIR}/db.sqlite"
+
+    class Config:
+        case_sensitive = True
+
+
+settings = Settings()

app/core/security.py

@@ -0,0 +1,40 @@
+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 a 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 a password against a hash
+    """
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def get_password_hash(password: str) -> str:
+    """
+    Hash a password
+    """
+    return pwd_context.hash(password)

app/crud/__init__.py

@@ -0,0 +1,3 @@
+from app.crud.crud_user import user
+
+__all__ = ["user"]

app/crud/base.py

@@ -0,0 +1,64 @@
+from typing import Any, Dict, Generic, List, Optional, Type, TypeVar, Union
+
+from fastapi.encoders import jsonable_encoder
+from pydantic import BaseModel
+from sqlalchemy.orm import Session
+
+from app.db.session import Base
+
+ModelType = TypeVar("ModelType", bound=Base)
+CreateSchemaType = TypeVar("CreateSchemaType", bound=BaseModel)
+UpdateSchemaType = TypeVar("UpdateSchemaType", bound=BaseModel)
+
+
+class CRUDBase(Generic[ModelType, CreateSchemaType, UpdateSchemaType]):
+    def __init__(self, model: Type[ModelType]):
+        """
+        CRUD object with default methods to Create, Read, Update, Delete (CRUD).
+        **Parameters**
+        * `model`: A SQLAlchemy model class
+        * `schema`: A Pydantic model (schema) class
+        """
+        self.model = model
+
+    def get(self, db: Session, id: Any) -> Optional[ModelType]:
+        return db.query(self.model).filter(self.model.id == id).first()
+
+    def get_multi(
+        self, db: Session, *, skip: int = 0, limit: int = 100
+    ) -> List[ModelType]:
+        return db.query(self.model).offset(skip).limit(limit).all()
+
+    def create(self, db: Session, *, obj_in: CreateSchemaType) -> ModelType:
+        obj_in_data = jsonable_encoder(obj_in)
+        db_obj = self.model(**obj_in_data)
+        db.add(db_obj)
+        db.commit()
+        db.refresh(db_obj)
+        return db_obj
+
+    def update(
+        self,
+        db: Session,
+        *,
+        db_obj: ModelType,
+        obj_in: Union[UpdateSchemaType, Dict[str, Any]]
+    ) -> ModelType:
+        obj_data = jsonable_encoder(db_obj)
+        if isinstance(obj_in, dict):
+            update_data = obj_in
+        else:
+            update_data = obj_in.model_dump(exclude_unset=True)
+        for field in obj_data:
+            if field in update_data:
+                setattr(db_obj, field, update_data[field])
+        db.add(db_obj)
+        db.commit()
+        db.refresh(db_obj)
+        return db_obj
+
+    def remove(self, db: Session, *, id: int) -> ModelType:
+        obj = db.query(self.model).get(id)
+        db.delete(obj)
+        db.commit()
+        return obj

app/crud/crud_user.py

@@ -0,0 +1,60 @@
+from typing import Any, Dict, Optional, Union
+
+from sqlalchemy.orm import Session
+
+from app.core.security import get_password_hash, verify_password
+from app.crud.base import CRUDBase
+from app.models.user import User
+from app.schemas.user import UserCreate, UserUpdate
+
+
+class CRUDUser(CRUDBase[User, UserCreate, UserUpdate]):
+    def get_by_email(self, db: Session, *, email: str) -> Optional[User]:
+        return db.query(User).filter(User.email == email).first()
+
+    def get_by_username(self, db: Session, *, username: str) -> Optional[User]:
+        return db.query(User).filter(User.username == username).first()
+
+    def create(self, db: Session, *, obj_in: UserCreate) -> User:
+        db_obj = User(
+            email=obj_in.email,
+            username=obj_in.username,
+            hashed_password=get_password_hash(obj_in.password),
+            full_name=obj_in.full_name,
+            is_active=obj_in.is_active,
+            is_admin=obj_in.is_admin,
+        )
+        db.add(db_obj)
+        db.commit()
+        db.refresh(db_obj)
+        return db_obj
+
+    def update(
+        self, db: Session, *, db_obj: User, obj_in: Union[UserUpdate, Dict[str, Any]]
+    ) -> User:
+        if isinstance(obj_in, dict):
+            update_data = obj_in
+        else:
+            update_data = obj_in.model_dump(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
+        return super().update(db, db_obj=db_obj, obj_in=update_data)
+
+    def authenticate(self, db: Session, *, email: str, password: str) -> Optional[User]:
+        user = self.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(self, user: User) -> bool:
+        return user.is_active
+
+    def is_admin(self, user: User) -> bool:
+        return user.is_admin
+
+
+user = CRUDUser(User)

app/db/base.py

@@ -0,0 +1,7 @@
+# Import all the models here so Alembic can discover them
+from app.db.session import Base  # noqa
+from app.models.user import User  # noqa
+from app.models.product import Category, Product  # noqa
+from app.models.order import Order, OrderItem  # noqa
+from app.models.cart import Cart, CartItem  # noqa
+from app.models.review import Review  # noqa

app/db/deps.py

@@ -0,0 +1,79 @@
+from typing import Generator
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from jose import JWTError, jwt
+from pydantic import ValidationError
+from sqlalchemy.orm import Session
+
+from app.core.config import settings
+from app.db.session import SessionLocal
+from app.models.user import User
+from app.schemas.token import TokenPayload
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl=f"{settings.API_V1_STR}/auth/login")
+
+
+def get_db() -> Generator:
+    """
+    Dependency for getting database session
+    """
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+def get_current_user(
+    db: Session = Depends(get_db), token: str = Depends(oauth2_scheme)
+) -> User:
+    """
+    Dependency for getting the current authenticated user
+    """
+    try:
+        payload = jwt.decode(
+            token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM]
+        )
+        token_data = TokenPayload(**payload)
+    except (JWTError, ValidationError) as e:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Could not validate credentials",
+            headers={"WWW-Authenticate": "Bearer"},
+        ) from e
+    user = db.query(User).filter(User.id == token_data.sub).first()
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="User not found"
+        )
+    return user
+
+
+def get_current_active_user(
+    current_user: User = Depends(get_current_user),
+) -> User:
+    """
+    Dependency for getting the current active user
+    """
+    if not current_user.is_active:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Inactive user"
+        )
+    return current_user
+
+
+def get_current_admin_user(
+    current_user: User = Depends(get_current_active_user),
+) -> User:
+    """
+    Dependency for getting the current admin user
+    """
+    if not current_user.is_admin:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Not enough permissions"
+        )
+    return current_user

app/db/session.py

@@ -0,0 +1,14 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+
+from app.core.config import settings
+
+engine = create_engine(
+    settings.SQLALCHEMY_DATABASE_URL,
+    connect_args={"check_same_thread": False}  # Needed for SQLite
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+Base = declarative_base()

app/models/__init__.py

@@ -0,0 +1,6 @@
+# Import models so they are registered with SQLAlchemy
+from app.models.user import User  # noqa
+from app.models.product import Category, Product  # noqa
+from app.models.order import Order, OrderItem, OrderStatus  # noqa
+from app.models.cart import Cart, CartItem  # noqa
+from app.models.review import Review  # noqa

app/models/cart.py

@@ -0,0 +1,33 @@
+from sqlalchemy import Column, DateTime, ForeignKey, Integer
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+
+from app.db.session import Base
+
+
+class Cart(Base):
+    __tablename__ = "carts"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), unique=True, nullable=False)
+
+    # Relationships
+    user = relationship("User", backref="cart", uselist=False)
+    items = relationship("CartItem", back_populates="cart", cascade="all, delete-orphan")
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+
+
+class CartItem(Base):
+    __tablename__ = "cart_items"
+
+    id = Column(Integer, primary_key=True, index=True)
+    cart_id = Column(Integer, ForeignKey("carts.id"), nullable=False)
+    product_id = Column(Integer, ForeignKey("products.id"), nullable=False)
+    quantity = Column(Integer, nullable=False, default=1)
+
+    # Relationships
+    cart = relationship("Cart", back_populates="items")
+    product = relationship("Product", back_populates="cart_items")
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())

app/models/order.py

@@ -0,0 +1,48 @@
+import enum
+
+from sqlalchemy import Column, DateTime, Enum, Float, ForeignKey, Integer, String, Text
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+
+from app.db.session import Base
+
+
+class OrderStatus(str, enum.Enum):
+    PENDING = "pending"
+    PAID = "paid"
+    SHIPPED = "shipped"
+    DELIVERED = "delivered"
+    CANCELLED = "cancelled"
+
+
+class Order(Base):
+    __tablename__ = "orders"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    status = Column(Enum(OrderStatus), default=OrderStatus.PENDING)
+    total_amount = Column(Float, nullable=False)
+    shipping_address = Column(Text, nullable=False)
+    payment_details = Column(Text)  # Could be a JSON field in other DBs
+    tracking_number = Column(String)
+
+    # Relationships
+    user = relationship("User", backref="orders")
+    items = relationship("OrderItem", back_populates="order", cascade="all, delete-orphan")
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+
+
+class OrderItem(Base):
+    __tablename__ = "order_items"
+
+    id = Column(Integer, primary_key=True, index=True)
+    order_id = Column(Integer, ForeignKey("orders.id"), nullable=False)
+    product_id = Column(Integer, ForeignKey("products.id"), nullable=False)
+    quantity = Column(Integer, nullable=False)
+    unit_price = Column(Float, nullable=False)
+
+    # Relationships
+    order = relationship("Order", back_populates="items")
+    product = relationship("Product", back_populates="order_items")
+    created_at = Column(DateTime(timezone=True), server_default=func.now())

app/models/product.py

@@ -0,0 +1,39 @@
+from sqlalchemy import Boolean, Column, DateTime, Float, ForeignKey, Integer, String, Text
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+
+from app.db.session import Base
+
+
+class Category(Base):
+    __tablename__ = "categories"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String, unique=True, index=True, nullable=False)
+    description = Column(Text)
+
+    # Relationships
+    products = relationship("Product", back_populates="category")
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+
+
+class Product(Base):
+    __tablename__ = "products"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String, index=True, nullable=False)
+    description = Column(Text)
+    price = Column(Float, nullable=False)
+    stock = Column(Integer, default=0)
+    image_url = Column(String)
+    is_active = Column(Boolean, default=True)
+    category_id = Column(Integer, ForeignKey("categories.id"))
+
+    # Relationships
+    category = relationship("Category", back_populates="products")
+    reviews = relationship("Review", back_populates="product", cascade="all, delete-orphan")
+    order_items = relationship("OrderItem", back_populates="product")
+    cart_items = relationship("CartItem", back_populates="product")
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())

app/models/review.py

@@ -0,0 +1,21 @@
+from sqlalchemy import Column, DateTime, Float, ForeignKey, Integer, Text
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+
+from app.db.session import Base
+
+
+class Review(Base):
+    __tablename__ = "reviews"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    product_id = Column(Integer, ForeignKey("products.id"), nullable=False)
+    rating = Column(Float, nullable=False)  # Rating from 1-5
+    comment = Column(Text)
+
+    # Relationships
+    user = relationship("User", backref="reviews")
+    product = relationship("Product", back_populates="reviews")
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())

app/models/user.py

@@ -0,0 +1,18 @@
+from sqlalchemy import Boolean, Column, DateTime, Integer, String
+from sqlalchemy.sql import func
+
+from app.db.session import Base
+
+
+class User(Base):
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, index=True)
+    email = Column(String, unique=True, index=True, nullable=False)
+    username = Column(String, unique=True, index=True, nullable=False)
+    hashed_password = Column(String, nullable=False)
+    full_name = Column(String, index=True)
+    is_active = Column(Boolean, default=True)
+    is_admin = Column(Boolean, default=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())

app/schemas/__init__.py

@@ -0,0 +1,5 @@
+# Import schemas for convenience
+from app.schemas.token import Token, TokenPayload
+from app.schemas.user import User, UserCreate, UserInDB, UserUpdate
+
+__all__ = ["Token", "TokenPayload", "User", "UserCreate", "UserInDB", "UserUpdate"]

app/schemas/token.py

@@ -0,0 +1,12 @@
+from typing import Optional
+
+from pydantic import BaseModel
+
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str
+
+
+class TokenPayload(BaseModel):
+    sub: Optional[int] = None

app/schemas/user.py

@@ -0,0 +1,45 @@
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel, EmailStr
+
+
+# Shared properties
+class UserBase(BaseModel):
+    email: Optional[EmailStr] = None
+    username: Optional[str] = None
+    is_active: Optional[bool] = True
+    is_admin: bool = False
+    full_name: Optional[str] = None
+
+
+# Properties to receive via API on creation
+class UserCreate(UserBase):
+    email: EmailStr
+    username: str
+    password: str
+
+
+# Properties to receive via API on update
+class UserUpdate(UserBase):
+    password: Optional[str] = None
+
+
+# Properties shared by models stored in DB
+class UserInDBBase(UserBase):
+    id: int
+    created_at: datetime
+    updated_at: Optional[datetime] = None
+
+    class Config:
+        from_attributes = True
+
+
+# Properties to return via API
+class User(UserInDBBase):
+    pass
+
+
+# Additional properties stored in DB but not returned by API
+class UserInDB(UserInDBBase):
+    hashed_password: str

main.py

@@ -0,0 +1,41 @@
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from app.api.router import api_router
+from app.core.config import settings
+
+app = FastAPI(
+    title=settings.PROJECT_NAME,
+    description="E-commerce API backend with FastAPI",
+    version="0.1.0",
+    openapi_url=f"{settings.API_V1_STR}/openapi.json",
+    docs_url="/docs",
+    redoc_url="/redoc",
+)
+
+# Set up 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)
+
+
+@app.get("/health", tags=["Health"])
+async def health_check():
+    """
+    Health check endpoint to verify the API is running
+    """
+    return {"status": "healthy"}
+
+
+if __name__ == "__main__":
+    import uvicorn
+
+    uvicorn.run("main:app", host="0.0.0.0", port=8000, reload=True)

migrations/README

@@ -0,0 +1 @@
+Generic single-database configuration for Alembic.

migrations/env.py

@@ -0,0 +1,83 @@
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+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
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+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,  # Key configuration for SQLite
+            compare_type=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/9a4f22e84e75_initial_migration.py

@@ -0,0 +1,177 @@
+"""Initial migration
+
+Revision ID: 9a4f22e84e75
+Revises:
+Create Date: 2023-10-30 00:00:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '9a4f22e84e75'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # Create users table
+    op.create_table(
+        'users',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('email', sa.String(), nullable=False),
+        sa.Column('username', sa.String(), nullable=False),
+        sa.Column('hashed_password', sa.String(), nullable=False),
+        sa.Column('full_name', sa.String(), nullable=True),
+        sa.Column('is_active', sa.Boolean(), nullable=True, default=True),
+        sa.Column('is_admin', sa.Boolean(), nullable=True, default=False),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+        sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_users_email'), 'users', ['email'], unique=True)
+    op.create_index(op.f('ix_users_id'), 'users', ['id'], unique=False)
+    op.create_index(op.f('ix_users_username'), 'users', ['username'], unique=True)
+    op.create_index(op.f('ix_users_full_name'), 'users', ['full_name'], unique=False)
+
+    # Create categories table
+    op.create_table(
+        'categories',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('name', sa.String(), nullable=False),
+        sa.Column('description', sa.Text(), nullable=True),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+        sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_categories_id'), 'categories', ['id'], unique=False)
+    op.create_index(op.f('ix_categories_name'), 'categories', ['name'], unique=True)
+
+    # Create products table
+    op.create_table(
+        'products',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('name', sa.String(), nullable=False),
+        sa.Column('description', sa.Text(), nullable=True),
+        sa.Column('price', sa.Float(), nullable=False),
+        sa.Column('stock', sa.Integer(), nullable=True, default=0),
+        sa.Column('image_url', sa.String(), nullable=True),
+        sa.Column('is_active', sa.Boolean(), nullable=True, default=True),
+        sa.Column('category_id', sa.Integer(), nullable=True),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+        sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True),
+        sa.ForeignKeyConstraint(['category_id'], ['categories.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_products_id'), 'products', ['id'], unique=False)
+    op.create_index(op.f('ix_products_name'), 'products', ['name'], unique=False)
+
+    # Create carts table
+    op.create_table(
+        'carts',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('user_id', sa.Integer(), nullable=False),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+        sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True),
+        sa.ForeignKeyConstraint(['user_id'], ['users.id'], ),
+        sa.PrimaryKeyConstraint('id'),
+        sa.UniqueConstraint('user_id')
+    )
+    op.create_index(op.f('ix_carts_id'), 'carts', ['id'], unique=False)
+
+    # Create cart_items table
+    op.create_table(
+        'cart_items',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('cart_id', sa.Integer(), nullable=False),
+        sa.Column('product_id', sa.Integer(), nullable=False),
+        sa.Column('quantity', sa.Integer(), nullable=False, default=1),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+        sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True),
+        sa.ForeignKeyConstraint(['cart_id'], ['carts.id'], ),
+        sa.ForeignKeyConstraint(['product_id'], ['products.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_cart_items_id'), 'cart_items', ['id'], unique=False)
+
+    # Create orders table
+    op.create_table(
+        'orders',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('user_id', sa.Integer(), nullable=False),
+        sa.Column('status', sa.Enum('pending', 'paid', 'shipped', 'delivered', 'cancelled', name='orderstatus'), nullable=True),
+        sa.Column('total_amount', sa.Float(), nullable=False),
+        sa.Column('shipping_address', sa.Text(), nullable=False),
+        sa.Column('payment_details', sa.Text(), nullable=True),
+        sa.Column('tracking_number', sa.String(), nullable=True),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+        sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True),
+        sa.ForeignKeyConstraint(['user_id'], ['users.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_orders_id'), 'orders', ['id'], unique=False)
+
+    # Create order_items table
+    op.create_table(
+        'order_items',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('order_id', sa.Integer(), nullable=False),
+        sa.Column('product_id', sa.Integer(), nullable=False),
+        sa.Column('quantity', sa.Integer(), nullable=False),
+        sa.Column('unit_price', sa.Float(), nullable=False),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+        sa.ForeignKeyConstraint(['order_id'], ['orders.id'], ),
+        sa.ForeignKeyConstraint(['product_id'], ['products.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_order_items_id'), 'order_items', ['id'], unique=False)
+
+    # Create reviews table
+    op.create_table(
+        'reviews',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('user_id', sa.Integer(), nullable=False),
+        sa.Column('product_id', sa.Integer(), nullable=False),
+        sa.Column('rating', sa.Float(), nullable=False),
+        sa.Column('comment', sa.Text(), nullable=True),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+        sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True),
+        sa.ForeignKeyConstraint(['product_id'], ['products.id'], ),
+        sa.ForeignKeyConstraint(['user_id'], ['users.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_reviews_id'), 'reviews', ['id'], unique=False)
+
+
+def downgrade() -> None:
+    # Drop all tables in reverse order
+    op.drop_index(op.f('ix_reviews_id'), table_name='reviews')
+    op.drop_table('reviews')
+    
+    op.drop_index(op.f('ix_order_items_id'), table_name='order_items')
+    op.drop_table('order_items')
+    
+    op.drop_index(op.f('ix_orders_id'), table_name='orders')
+    op.drop_table('orders')
+    
+    op.drop_index(op.f('ix_cart_items_id'), table_name='cart_items')
+    op.drop_table('cart_items')
+    
+    op.drop_index(op.f('ix_carts_id'), table_name='carts')
+    op.drop_table('carts')
+    
+    op.drop_index(op.f('ix_products_name'), table_name='products')
+    op.drop_index(op.f('ix_products_id'), table_name='products')
+    op.drop_table('products')
+    
+    op.drop_index(op.f('ix_categories_name'), table_name='categories')
+    op.drop_index(op.f('ix_categories_id'), table_name='categories')
+    op.drop_table('categories')
+    
+    op.drop_index(op.f('ix_users_full_name'), table_name='users')
+    op.drop_index(op.f('ix_users_username'), table_name='users')
+    op.drop_index(op.f('ix_users_email'), table_name='users')
+    op.drop_index(op.f('ix_users_id'), table_name='users')
+    op.drop_table('users')

pyproject.toml

@@ -0,0 +1,19 @@
+[tool.ruff]
+line-length = 100
+target-version = "py38"
+
+[tool.ruff.lint]
+select = ["E", "F", "B", "I", "N", "W"]
+ignore = [
+    "E203",  # Whitespace before ':' (for black compatibility)
+    "E501",  # Line too long (will be handled by formatter)
+]
+
+[tool.ruff.lint.isort]
+known-third-party = ["fastapi", "pydantic", "sqlalchemy", "starlette", "alembic"]
+
+[tool.ruff.lint.per-file-ignores]
+# Tests can use assert
+"tests/**/*" = ["S101"]
+# Allow longer lines in settings
+"app/core/config.py" = ["E501"]

requirements.txt

@@ -0,0 +1,13 @@
+fastapi>=0.104.0
+uvicorn>=0.23.2
+sqlalchemy>=2.0.23
+alembic>=1.12.0
+pydantic>=2.4.2
+pydantic-settings>=2.0.3
+python-jose[cryptography]>=3.3.0
+passlib[bcrypt]>=1.7.4
+python-multipart>=0.0.6
+email-validator>=2.0.0
+ruff>=0.1.3
+httpx>=0.24.1
+pytest>=7.4.3