Build barebones task manager API with FastAPI and SQLite

- Create FastAPI application with CORS support
- Implement Task model with SQLAlchemy
- Set up database session and migrations with Alembic
- Add CRUD endpoints for task management
- Include health check and API documentation endpoints
- Configure Ruff for code formatting and linting

README.md

@@ -1,3 +1,52 @@
-# FastAPI Application
+# Task Manager API
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A barebones task manager API built with FastAPI and SQLite.
+
+## Features
+
+- Create, read, update, and delete tasks
+- SQLite database with Alembic migrations
+- RESTful API endpoints
+- Health check endpoint
+- CORS support
+- OpenAPI documentation
+
+## Requirements
+
+- Python 3.8+
+- FastAPI
+- SQLite
+
+## Installation
+
+1. Install dependencies:
+```bash
+pip install -r requirements.txt
+```
+
+2. Run the application:
+```bash
+uvicorn main:app --reload
+```
+
+The API will be available at `http://localhost:8000`
+
+## API Endpoints
+
+- `GET /` - API information
+- `GET /health` - Health check
+- `GET /api/v1/tasks/` - List all tasks
+- `POST /api/v1/tasks/` - Create a new task
+- `GET /api/v1/tasks/{task_id}` - Get a specific task
+- `PUT /api/v1/tasks/{task_id}` - Update a task
+- `DELETE /api/v1/tasks/{task_id}` - Delete a task
+
+## Documentation
+
+- OpenAPI spec: `http://localhost:8000/openapi.json`
+- Swagger UI: `http://localhost:8000/docs`
+- ReDoc: `http://localhost:8000/redoc`
+
+## Database
+
+The application uses SQLite with the database file stored at `/app/storage/db/db.sqlite`.

alembic.ini

@@ -0,0 +1,42 @@
+[alembic]
+script_location = alembic
+prepend_sys_path = .
+version_path_separator = os
+sqlalchemy.url = sqlite:////app/storage/db/db.sqlite
+version_locations = %(here)s/alembic/versions
+
+[post_write_hooks]
+
+[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

alembic/env.py

@@ -0,0 +1,50 @@
+import sys
+from pathlib import Path
+from logging.config import fileConfig
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+from alembic import context
+
+sys.path.append(str(Path(__file__).parent.parent))
+
+from app.db.base import Base
+
+config = context.config
+
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+target_metadata = Base.metadata
+
+
+def run_migrations_offline() -> None:
+    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:
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(connection=connection, target_metadata=target_metadata)
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

alembic/script.py.mako

@@ -0,0 +1,23 @@
+"""${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 = ${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"}

alembic/versions/001_create_tasks_table.py

@@ -0,0 +1,44 @@
+"""create tasks table
+
+Revision ID: 001
+Revises:
+Create Date: 2024-01-01 12:00:00.000000
+
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+revision = "001"
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "tasks",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("title", sa.String(), nullable=False),
+        sa.Column("description", sa.String(), nullable=True),
+        sa.Column("completed", sa.Boolean(), 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),
+            server_default=sa.text("(CURRENT_TIMESTAMP)"),
+            nullable=True,
+        ),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index(op.f("ix_tasks_id"), "tasks", ["id"], unique=False)
+
+
+def downgrade() -> None:
+    op.drop_index(op.f("ix_tasks_id"), table_name="tasks")
+    op.drop_table("tasks")

app/api/__init__.py

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+from .tasks import router as tasks_router
+
+__all__ = ["tasks_router"]

app/api/tasks.py

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+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+from typing import List
+from app.db import get_db
+from app.models import Task
+from app.schemas import TaskCreate, TaskUpdate, Task as TaskSchema
+
+router = APIRouter()
+
+
+@router.post("/tasks/", response_model=TaskSchema)
+def create_task(task: TaskCreate, db: Session = Depends(get_db)):
+    db_task = Task(**task.dict())
+    db.add(db_task)
+    db.commit()
+    db.refresh(db_task)
+    return db_task
+
+
+@router.get("/tasks/", response_model=List[TaskSchema])
+def read_tasks(skip: int = 0, limit: int = 100, db: Session = Depends(get_db)):
+    tasks = db.query(Task).offset(skip).limit(limit).all()
+    return tasks
+
+
+@router.get("/tasks/{task_id}", response_model=TaskSchema)
+def read_task(task_id: int, db: Session = Depends(get_db)):
+    task = db.query(Task).filter(Task.id == task_id).first()
+    if task is None:
+        raise HTTPException(status_code=404, detail="Task not found")
+    return task
+
+
+@router.put("/tasks/{task_id}", response_model=TaskSchema)
+def update_task(task_id: int, task_update: TaskUpdate, db: Session = Depends(get_db)):
+    task = db.query(Task).filter(Task.id == task_id).first()
+    if task is None:
+        raise HTTPException(status_code=404, detail="Task not found")
+
+    update_data = task_update.dict(exclude_unset=True)
+    for field, value in update_data.items():
+        setattr(task, field, value)
+
+    db.commit()
+    db.refresh(task)
+    return task
+
+
+@router.delete("/tasks/{task_id}")
+def delete_task(task_id: int, db: Session = Depends(get_db)):
+    task = db.query(Task).filter(Task.id == task_id).first()
+    if task is None:
+        raise HTTPException(status_code=404, detail="Task not found")
+
+    db.delete(task)
+    db.commit()
+    return {"message": "Task deleted successfully"}

app/db/__init__.py

@@ -0,0 +1,4 @@
+from .base import Base
+from .session import get_db, engine
+
+__all__ = ["Base", "get_db", "engine"]

app/db/base.py

@@ -0,0 +1,3 @@
+from sqlalchemy.ext.declarative import declarative_base
+
+Base = declarative_base()

app/db/session.py

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+from pathlib import Path
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+DB_DIR = Path("/app") / "storage" / "db"
+DB_DIR.mkdir(parents=True, exist_ok=True)
+
+SQLALCHEMY_DATABASE_URL = f"sqlite:///{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 +1,3 @@
+from .task import Task
+
+__all__ = ["Task"]

app/models/task.py

@@ -0,0 +1,16 @@
+from sqlalchemy import Column, Integer, String, Boolean, DateTime
+from sqlalchemy.sql import func
+from app.db.base import Base
+
+
+class Task(Base):
+    __tablename__ = "tasks"
+
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String, nullable=False)
+    description = Column(String, nullable=True)
+    completed = Column(Boolean, default=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(
+        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
+    )

app/schemas.py

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+from pydantic import BaseModel
+from datetime import datetime
+from typing import Optional
+
+
+class TaskBase(BaseModel):
+    title: str
+    description: Optional[str] = None
+    completed: bool = False
+
+
+class TaskCreate(TaskBase):
+    pass
+
+
+class TaskUpdate(BaseModel):
+    title: Optional[str] = None
+    description: Optional[str] = None
+    completed: Optional[bool] = None
+
+
+class Task(TaskBase):
+    id: int
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True

main.py

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+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from app.api import tasks_router
+from app.db import Base, engine
+
+Base.metadata.create_all(bind=engine)
+
+app = FastAPI(
+    title="Task Manager API",
+    description="A simple task manager API built with FastAPI",
+    version="1.0.0",
+    openapi_url="/openapi.json",
+)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+app.include_router(tasks_router, prefix="/api/v1")
+
+
+@app.get("/")
+def read_root():
+    return {"title": "Task Manager API", "documentation": "/docs", "health": "/health"}
+
+
+@app.get("/health")
+def health_check():
+    return {"status": "healthy", "service": "Task Manager API"}

requirements.txt

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+fastapi==0.104.1
+uvicorn==0.24.0
+sqlalchemy==2.0.23
+alembic==1.12.1
+pydantic==2.5.0
+ruff==0.1.6