Create FastAPI application with basic CRUD functionality

- Set up project structure with FastAPI app
- Implement items CRUD API endpoints
- Configure SQLite database with SQLAlchemy
- Set up Alembic migrations
- Add health check endpoint
- Enable CORS middleware
- Create README with documentation

README.md

@@ -1,3 +1,127 @@
-# FastAPI Application
+# Quick API Service
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A simple FastAPI application that provides a quick working API with basic CRUD operations.
+
+## Features
+
+- RESTful API with FastAPI
+- SQLite database with SQLAlchemy ORM
+- Alembic migrations for database versioning
+- CORS middleware enabled
+- Health check endpoint
+- Swagger documentation at `/docs`
+- ReDoc documentation at `/redoc`
+
+## Project Structure
+
+```
+.
+├── app
+│   ├── api
+│   │   └── v1
+│   │       ├── api.py
+│   │       └── endpoints
+│   │           └── items.py
+│   ├── core
+│   │   └── config.py
+│   ├── crud
+│   │   └── item.py
+│   ├── db
+│   │   ├── base.py
+│   │   └── session.py
+│   ├── models
+│   │   └── item.py
+│   ├── schemas
+│   │   └── item.py
+│   └── storage
+│       └── db
+├── migrations
+│   ├── env.py
+│   ├── README
+│   ├── script.py.mako
+│   └── versions
+│       └── 53b8c3f67ecb_create_items_table.py
+├── alembic.ini
+├── main.py
+├── README.md
+└── requirements.txt
+```
+
+## Installation
+
+1. Clone the repository:
+
+```bash
+git clone <repository-url>
+cd quickapiservice
+```
+
+2. Install dependencies:
+
+```bash
+pip install -r requirements.txt
+```
+
+3. Run the migrations:
+
+```bash
+alembic upgrade head
+```
+
+4. Start the application:
+
+```bash
+uvicorn main:app --reload
+```
+
+The API will be available at http://localhost:8000
+
+## API Endpoints
+
+- `GET /`: Root endpoint with basic information
+- `GET /health`: Health check endpoint
+- `GET /docs`: Swagger documentation
+- `GET /redoc`: ReDoc documentation
+
+### Items API
+
+- `GET /api/v1/items`: Get all items
+- `POST /api/v1/items`: Create a new item
+- `GET /api/v1/items/{item_id}`: Get an item by ID
+- `PUT /api/v1/items/{item_id}`: Update an item
+- `DELETE /api/v1/items/{item_id}`: Delete an item
+
+## Example API Usage
+
+### Create an Item
+
+```bash
+curl -X 'POST' \
+  'http://localhost:8000/api/v1/items/' \
+  -H 'Content-Type: application/json' \
+  -d '{
+  "title": "Example Item",
+  "description": "This is an example item"
+}'
+```
+
+### Get All Items
+
+```bash
+curl -X 'GET' 'http://localhost:8000/api/v1/items/'
+```
+
+## Development
+
+The application uses SQLite for the database, which is stored at `/app/storage/db/db.sqlite`. 
+
+To apply new migrations:
+
+```bash
+alembic revision --autogenerate -m "description"
+alembic upgrade head
+```
+
+## License
+
+This project is licensed under the MIT License.

alembic.ini

@@ -0,0 +1,102 @@
+# 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
+
+# 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/__init__.py

@@ -0,0 +1 @@
+# This file is intentionally left empty to make the directory a Python package

app/api/__init__.py

@@ -0,0 +1 @@
+# This file is intentionally left empty to make the directory a Python package

app/api/v1/__init__.py

@@ -0,0 +1 @@
+# This file is intentionally left empty to make the directory a Python package

app/api/v1/api.py

@@ -0,0 +1,5 @@
+from fastapi import APIRouter
+from app.api.v1.endpoints import items
+
+api_router = APIRouter()
+api_router.include_router(items.router, prefix="/items", tags=["items"])

app/api/v1/endpoints/__init__.py

@@ -0,0 +1 @@
+# This file is intentionally left empty to make the directory a Python package

app/api/v1/endpoints/items.py

@@ -0,0 +1,39 @@
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+from typing import List
+
+from app.db.session import get_db
+from app.schemas.item import Item, ItemCreate, ItemUpdate
+from app.crud import item as item_crud
+
+router = APIRouter()
+
+@router.get("/", response_model=List[Item])
+def read_items(skip: int = 0, limit: int = 100, db: Session = Depends(get_db)):
+    items = item_crud.get_items(db, skip=skip, limit=limit)
+    return items
+
+@router.post("/", response_model=Item, status_code=status.HTTP_201_CREATED)
+def create_item(item: ItemCreate, db: Session = Depends(get_db)):
+    return item_crud.create_item(db=db, item=item)
+
+@router.get("/{item_id}", response_model=Item)
+def read_item(item_id: int, db: Session = Depends(get_db)):
+    db_item = item_crud.get_item(db, item_id=item_id)
+    if db_item is None:
+        raise HTTPException(status_code=404, detail="Item not found")
+    return db_item
+
+@router.put("/{item_id}", response_model=Item)
+def update_item(item_id: int, item: ItemUpdate, db: Session = Depends(get_db)):
+    db_item = item_crud.update_item(db, item_id=item_id, item=item)
+    if db_item is None:
+        raise HTTPException(status_code=404, detail="Item not found")
+    return db_item
+
+@router.delete("/{item_id}", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
+def delete_item(item_id: int, db: Session = Depends(get_db)):
+    success = item_crud.delete_item(db, item_id=item_id)
+    if not success:
+        raise HTTPException(status_code=404, detail="Item not found")
+    return None

app/core/config.py

@@ -0,0 +1,13 @@
+from pydantic_settings import BaseSettings
+
+class Settings(BaseSettings):
+    API_V1_STR: str = "/api/v1"
+    PROJECT_NAME: str = "Quick API Service"
+    
+    # Set environment variables if needed
+    # DATABASE_URL: str = os.environ.get("DATABASE_URL", "sqlite:///./app.db")
+    
+    class Config:
+        env_file = ".env"
+
+settings = Settings()

app/crud/__init__.py

@@ -0,0 +1 @@
+# This file is intentionally left empty to make the directory a Python package

app/crud/item.py

@@ -0,0 +1,39 @@
+from sqlalchemy.orm import Session
+from app.models.item import Item
+from app.schemas.item import ItemCreate, ItemUpdate
+from typing import List, Optional
+
+def get_items(db: Session, skip: int = 0, limit: int = 100) -> List[Item]:
+    return db.query(Item).offset(skip).limit(limit).all()
+
+def get_item(db: Session, item_id: int) -> Optional[Item]:
+    return db.query(Item).filter(Item.id == item_id).first()
+
+def create_item(db: Session, item: ItemCreate) -> Item:
+    db_item = Item(**item.model_dump())
+    db.add(db_item)
+    db.commit()
+    db.refresh(db_item)
+    return db_item
+
+def update_item(db: Session, item_id: int, item: ItemUpdate) -> Optional[Item]:
+    db_item = get_item(db, item_id)
+    if db_item is None:
+        return None
+    
+    update_data = item.model_dump(exclude_unset=True)
+    for key, value in update_data.items():
+        setattr(db_item, key, value)
+    
+    db.commit()
+    db.refresh(db_item)
+    return db_item
+
+def delete_item(db: Session, item_id: int) -> bool:
+    db_item = get_item(db, item_id)
+    if db_item is None:
+        return False
+    
+    db.delete(db_item)
+    db.commit()
+    return True

app/db/__init__.py

@@ -0,0 +1 @@
+# This file is intentionally left empty to make the directory a Python package

app/db/base.py

@@ -0,0 +1,4 @@
+from sqlalchemy.ext.declarative import declarative_base
+
+# Create a base class for SQLAlchemy models
+Base = declarative_base()

app/db/session.py

@@ -0,0 +1,27 @@
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+from pathlib import Path
+
+# Create database directory if it doesn't exist
+DB_DIR = Path("/app") / "storage" / "db"
+DB_DIR.mkdir(parents=True, exist_ok=True)
+
+# Database URL
+SQLALCHEMY_DATABASE_URL = f"sqlite:///{DB_DIR}/db.sqlite"
+
+# Create SQLAlchemy engine
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL,
+    connect_args={"check_same_thread": False}
+)
+
+# Create SessionLocal class
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+# Dependency for getting DB session
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()

app/models/__init__.py

@@ -0,0 +1 @@
+from app.models.item import Item  # noqa

app/models/item.py

@@ -0,0 +1,12 @@
+from sqlalchemy import Column, Integer, String, Text, DateTime
+from sqlalchemy.sql import func
+from app.db.base import Base
+
+class Item(Base):
+    __tablename__ = "items"
+
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String(100), nullable=False)
+    description = Column(Text, nullable=True)
+    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 @@
+# This file is intentionally left empty to make the directory a Python package

app/schemas/item.py

@@ -0,0 +1,21 @@
+from pydantic import BaseModel
+from datetime import datetime
+from typing import Optional
+
+class ItemBase(BaseModel):
+    title: str
+    description: Optional[str] = None
+
+class ItemCreate(ItemBase):
+    pass
+
+class ItemUpdate(ItemBase):
+    title: Optional[str] = None
+
+class Item(ItemBase):
+    id: int
+    created_at: datetime
+    updated_at: Optional[datetime] = None
+
+    class Config:
+        from_attributes = True

main.py

@@ -0,0 +1,48 @@
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+import uvicorn
+
+from app.api.v1.api import api_router
+from app.core.config import settings
+from app.db.base import Base
+from app.db.session import engine
+
+# Create FastAPI app
+app = FastAPI(
+    title="Quick API Service",
+    description="A simple FastAPI service with basic functionality",
+    version="0.1.0",
+    openapi_url="/openapi.json",
+)
+
+# Configure CORS
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Create database tables
+Base.metadata.create_all(bind=engine)
+
+# 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"}
+
+# Root endpoint
+@app.get("/", tags=["Root"])
+async def root():
+    return {
+        "title": settings.PROJECT_NAME,
+        "docs": "/docs",
+        "health": "/health"
+    }
+
+if __name__ == "__main__":
+    uvicorn.run("main:app", host="0.0.0.0", port=8000, reload=True)

migrations/README

@@ -0,0 +1 @@
+Generic single-database configuration with SQLite.

migrations/env.py

@@ -0,0 +1,82 @@
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+# Import models for Alembic autogenerate support
+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,  # Key configuration for SQLite
+        )
+
+        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/53b8c3f67ecb_create_items_table.py

@@ -0,0 +1,33 @@
+"""create items table
+
+Revision ID: 53b8c3f67ecb
+Revises: 
+Create Date: 2023-12-01 00:00:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '53b8c3f67ecb'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.create_table('items',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('title', sa.String(length=100), 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_items_id'), 'items', ['id'], unique=False)
+
+
+def downgrade() -> None:
+    op.drop_index(op.f('ix_items_id'), table_name='items')
+    op.drop_table('items')

requirements.txt

@@ -0,0 +1,8 @@
+fastapi>=0.104.1
+uvicorn>=0.24.0
+pydantic>=2.4.2
+pydantic-settings>=2.0.3
+sqlalchemy>=2.0.23
+alembic>=1.12.1
+python-multipart>=0.0.6
+ruff>=0.1.6