Initial implementation of REST API with FastAPI and SQLite

README.md

@@ -1,3 +1,103 @@
-# FastAPI Application
+# Generic REST API
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+This is a REST API built with FastAPI and SQLite. It provides endpoints for managing items with full CRUD operations.
+
+## Features
+
+- FastAPI framework for high performance
+- SQLite database for data storage
+- SQLAlchemy ORM for database interactions
+- Alembic for database migrations
+- Pydantic for data validation
+- Automatic OpenAPI documentation
+- CORS enabled
+- Health check endpoint
+
+## Requirements
+
+- Python 3.8+
+- All dependencies listed in `requirements.txt`
+
+## Setup
+
+1. Clone the repository
+2. Install dependencies:
+
+```bash
+pip install -r requirements.txt
+```
+
+3. Create and migrate database:
+
+```bash
+# The storage directory and database will be created automatically when running the app
+```
+
+## Running the Application
+
+Start the application with:
+
+```bash
+uvicorn main:app --host 0.0.0.0 --port 8000 --reload
+```
+
+## API Documentation
+
+Once the application is running, you can access:
+
+- Interactive API documentation: [http://localhost:8000/docs](http://localhost:8000/docs)
+- Alternative API documentation: [http://localhost:8000/redoc](http://localhost:8000/redoc)
+- OpenAPI schema: [http://localhost:8000/openapi.json](http://localhost:8000/openapi.json)
+
+## API Endpoints
+
+- `GET /`: API information
+- `GET /health`: Health check endpoint
+- `GET /api/v1/items`: List all items
+- `POST /api/v1/items`: Create a new item
+- `GET /api/v1/items/{id}`: Get an item by ID
+- `PUT /api/v1/items/{id}`: Update an item
+- `DELETE /api/v1/items/{id}`: Delete an item
+
+## Project Structure
+
+```
+.
+├── alembic.ini             # Alembic configuration
+├── app                     # Application package
+│   ├── api                 # API endpoints
+│   │   └── v1              # API version 1
+│   │       ├── api.py      # API router setup
+│   │       └── endpoints   # Endpoint modules
+│   │           └── items.py # Items endpoints
+│   ├── core                # Core application code
+│   │   └── config.py       # Application configuration
+│   ├── crud                # CRUD operations
+│   │   ├── base.py         # Base CRUD class
+│   │   └── item.py         # Item CRUD operations
+│   ├── db                  # Database setup
+│   │   ├── base.py         # Base model imports
+│   │   ├── base_class.py   # Base model class
+│   │   ├── init_db.py      # Database initialization
+│   │   └── session.py      # Database session
+│   ├── models              # Database models
+│   │   └── item.py         # Item model
+│   └── schemas             # Pydantic schemas
+│       └── item.py         # Item schemas
+├── main.py                 # Application entry point
+├── migrations              # Database migrations
+│   ├── env.py              # Alembic environment
+│   ├── README              # Migrations README
+│   ├── script.py.mako      # Migration script template
+│   └── versions            # Migration versions
+└── requirements.txt        # Python dependencies
+```
+
+## Development
+
+To lint and format the code:
+
+```bash
+ruff check .
+ruff format .
+```

alembic.ini

@@ -0,0 +1,103 @@
+# 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
+
+# SQLite URL - use absolute path
+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/v1/api.py

@@ -0,0 +1,8 @@
+from fastapi import APIRouter
+
+from app.api.v1.endpoints import items
+
+api_router = APIRouter()
+
+# Include all API endpoint routers here
+api_router.include_router(items.router, prefix="/items", tags=["items"])

app/api/v1/endpoints/items.py

@@ -0,0 +1,78 @@
+from typing import Any, List, Optional
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app import crud, schemas
+from app.db.session import get_db
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[schemas.Item])
+def read_items(
+    db: Session = Depends(get_db),
+    skip: int = 0,
+    limit: int = 100,
+    title: Optional[str] = None,
+) -> Any:
+    """
+    Retrieve items.
+    """
+    if title:
+        items = crud.item.get_by_title(db, title=title)
+    else:
+        items = crud.item.get_multi(db, skip=skip, limit=limit)
+    return items
+
+
+@router.post("/", response_model=schemas.Item, status_code=status.HTTP_201_CREATED)
+def create_item(*, db: Session = Depends(get_db), item_in: schemas.ItemCreate) -> Any:
+    """
+    Create new item.
+    """
+    item = crud.item.create(db=db, obj_in=item_in)
+    return item
+
+
+@router.get("/{id}", response_model=schemas.Item)
+def read_item(*, db: Session = Depends(get_db), id: int) -> Any:
+    """
+    Get item by ID.
+    """
+    item = crud.item.get(db=db, id=id)
+    if not item:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND, detail="Item not found"
+        )
+    return item
+
+
+@router.put("/{id}", response_model=schemas.Item)
+def update_item(
+    *, db: Session = Depends(get_db), id: int, item_in: schemas.ItemUpdate
+) -> Any:
+    """
+    Update an item.
+    """
+    item = crud.item.get(db=db, id=id)
+    if not item:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND, detail="Item not found"
+        )
+    item = crud.item.update(db=db, db_obj=item, obj_in=item_in)
+    return item
+
+
+@router.delete("/{id}", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
+def delete_item(*, db: Session = Depends(get_db), id: int) -> Any:
+    """
+    Delete an item.
+    """
+    item = crud.item.get(db=db, id=id)
+    if not item:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND, detail="Item not found"
+        )
+    crud.item.remove(db=db, id=id)
+    return None

app/core/config.py

@@ -0,0 +1,32 @@
+from pathlib import Path
+from typing import List
+
+from pydantic import validator
+from pydantic_settings import BaseSettings
+
+
+class Settings(BaseSettings):
+    API_V1_STR: str = "/api/v1"
+    PROJECT_NAME: str = "Generic REST API"
+
+    # CORS Configuration
+    BACKEND_CORS_ORIGINS: List[str] = ["*"]
+
+    @validator("BACKEND_CORS_ORIGINS", pre=True)
+    def assemble_cors_origins(cls, v: str | List[str]) -> List[str] | str:
+        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)
+
+    # Database Configuration
+    DB_DIR: Path = Path("/app") / "storage" / "db"
+    SQLALCHEMY_DATABASE_URL: str = f"sqlite:///{DB_DIR}/db.sqlite"
+
+    class Config:
+        case_sensitive = True
+        env_file = ".env"
+
+
+settings = Settings()

app/crud/__init__.py

@@ -0,0 +1 @@
+from app.crud.item import item  # noqa: F401

app/crud/base.py

@@ -0,0 +1,66 @@
+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.base_class 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/item.py

@@ -0,0 +1,15 @@
+from typing import List
+
+from sqlalchemy.orm import Session
+
+from app.crud.base import CRUDBase
+from app.models.item import Item
+from app.schemas.item import ItemCreate, ItemUpdate
+
+
+class CRUDItem(CRUDBase[Item, ItemCreate, ItemUpdate]):
+    def get_by_title(self, db: Session, *, title: str) -> List[Item]:
+        return db.query(self.model).filter(self.model.title.contains(title)).all()
+
+
+item = CRUDItem(Item)

app/db/base.py

@@ -0,0 +1,5 @@
+# Import all the models, so that Base has them before being imported by Alembic
+from app.db.base_class import Base  # noqa
+
+# Import all models here to ensure Alembic detects them
+from app.models.item import Item  # noqa

app/db/base_class.py

@@ -0,0 +1,20 @@
+from datetime import datetime
+from typing import Any
+
+from sqlalchemy import Column, DateTime
+from sqlalchemy.ext.declarative import as_declarative, declared_attr
+
+
+@as_declarative()
+class Base:
+    id: Any
+    __name__: str
+
+    # Generate __tablename__ automatically based on class name
+    @declared_attr
+    def __tablename__(cls) -> str:
+        return cls.__name__.lower()
+
+    # Add created_at and updated_at columns to all models
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

app/db/init_db.py

@@ -0,0 +1,14 @@
+from sqlalchemy.orm import Session
+
+# Import all models here
+# from app.models.item import Item
+# Import all base models for type checking
+from app.db.base_class import Base  # noqa
+
+
+def init_db(db: Session) -> None:
+    """
+    Initialize the database with initial data if needed.
+    """
+    # Create initial data here if needed
+    pass

app/db/session.py

@@ -0,0 +1,26 @@
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+from app.core.config import settings
+
+# Ensure the database directory exists
+settings.DB_DIR.mkdir(parents=True, exist_ok=True)
+
+engine = create_engine(
+    settings.SQLALCHEMY_DATABASE_URL,
+    connect_args={"check_same_thread": False},  # Only needed for SQLite
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+def get_db():
+    """
+    Dependency for getting a database session.
+    To be used with FastAPI's dependency injection system.
+    """
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()

app/models/item.py

@@ -0,0 +1,14 @@
+from sqlalchemy import Boolean, Column, Integer, String, Text
+
+from app.db.base_class import Base
+
+
+class Item(Base):
+    """
+    Database model for items.
+    """
+
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String(255), index=True, nullable=False)
+    description = Column(Text, nullable=True)
+    is_active = Column(Boolean, default=True)

app/schemas/__init__.py

@@ -0,0 +1 @@
+from app.schemas.item import Item, ItemCreate, ItemInDB, ItemUpdate  # noqa: F401

app/schemas/item.py

@@ -0,0 +1,47 @@
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel, Field
+
+
+# Shared properties
+class ItemBase(BaseModel):
+    title: str = Field(..., min_length=1, max_length=255, example="My Item")
+    description: Optional[str] = Field(
+        None, example="A detailed description of my item"
+    )
+    is_active: Optional[bool] = Field(True, example=True)
+
+
+# Properties to receive on item creation
+class ItemCreate(ItemBase):
+    pass
+
+
+# Properties to receive on item update
+class ItemUpdate(BaseModel):
+    title: Optional[str] = Field(
+        None, min_length=1, max_length=255, example="Updated Item Title"
+    )
+    description: Optional[str] = Field(None, example="Updated description")
+    is_active: Optional[bool] = Field(None, example=True)
+
+
+# Properties shared by models stored in DB
+class ItemInDBBase(ItemBase):
+    id: int
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+# Properties to return to client
+class Item(ItemInDBBase):
+    pass
+
+
+# Properties stored in DB
+class ItemInDB(ItemInDBBase):
+    pass

main.py

@@ -0,0 +1,56 @@
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from fastapi.openapi.utils import get_openapi
+
+from app.api.v1.api import api_router
+from app.core.config import settings
+
+app = FastAPI(
+    title=settings.PROJECT_NAME,
+    openapi_url="/openapi.json",
+)
+
+# Set up CORS middleware
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=[origin for origin in settings.BACKEND_CORS_ORIGINS],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Include API router
+app.include_router(api_router, prefix=settings.API_V1_STR)
+
+
+@app.get("/")
+async def root():
+    """Root endpoint with API information."""
+    return {"name": settings.PROJECT_NAME, "docs": "/docs", "health_check": "/health"}
+
+
+@app.get("/health", status_code=200)
+async def health_check():
+    """Health check endpoint."""
+    return {"status": "healthy"}
+
+
+def custom_openapi():
+    if app.openapi_schema:
+        return app.openapi_schema
+    openapi_schema = get_openapi(
+        title=settings.PROJECT_NAME,
+        version="1.0.0",
+        description="Generic REST API with FastAPI and SQLite",
+        routes=app.routes,
+    )
+    app.openapi_schema = openapi_schema
+    return app.openapi_schema
+
+
+app.openapi = custom_openapi
+
+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 with SQLite.

migrations/env.py

@@ -0,0 +1,80 @@
+from logging.config import fileConfig
+
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+
+# 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 app.db.base import Base  # noqa
+
+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,  # For SQLite, use batch mode
+            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/initial_migration.py

@@ -0,0 +1,41 @@
+"""initial migration
+
+Revision ID: 1a1c3d5e7f9b
+Revises:
+Create Date: 2023-10-31 12:00:00.000000
+
+"""
+
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "1a1c3d5e7f9b"
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table(
+        "item",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("title", sa.String(length=255), nullable=False),
+        sa.Column("description", sa.Text(), nullable=True),
+        sa.Column("is_active", 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_item_id"), "item", ["id"], unique=False)
+    op.create_index(op.f("ix_item_title"), "item", ["title"], unique=False)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index(op.f("ix_item_title"), table_name="item")
+    op.drop_index(op.f("ix_item_id"), table_name="item")
+    op.drop_table("item")
+    # ### end Alembic commands ###

pyproject.toml

@@ -0,0 +1,10 @@
+[tool.ruff]
+line-length = 88
+target-version = "py38"
+
+[tool.ruff.lint]
+select = ["E", "F", "B", "I"]
+ignore = ["B008"]  # Allow function calls in argument defaults for FastAPI dependencies
+
+[tool.ruff.lint.isort]
+known-third-party = ["fastapi", "pydantic", "sqlalchemy", "alembic"]

requirements.txt

@@ -0,0 +1,12 @@
+fastapi>=0.104.0
+uvicorn>=0.23.2
+sqlalchemy>=2.0.0
+alembic>=1.12.0
+pydantic>=2.4.2
+pydantic-settings>=2.0.3
+ruff>=0.1.0
+python-dotenv>=1.0.0
+aiosqlite>=0.19.0
+httpx>=0.25.0
+python-multipart>=0.0.6
+email-validator>=2.1.0