Implement Task Manager API with FastAPI and SQLite

- Created FastAPI application structure with main.py and requirements.txt
- Setup SQLite database with SQLAlchemy models for tasks
- Implemented Alembic migrations for database schema management
- Added CRUD endpoints for task management (GET, POST, PUT, DELETE)
- Configured CORS middleware to allow all origins
- Added health endpoint and base route with API information
- Updated README with comprehensive documentation
- Applied code formatting with Ruff linter

README.md

@@ -1,3 +1,93 @@
-# FastAPI Application
+# Task Manager API
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A simple task management API built with FastAPI and SQLite.
+
+## Features
+
+- Create, read, update, and delete tasks
+- Task priority levels (high, medium, low)
+- Task completion status tracking
+- RESTful API design
+- Automatic API documentation with Swagger UI
+
+## Quick Start
+
+1. Install dependencies:
+   ```bash
+   pip install -r requirements.txt
+   ```
+
+2. Run database migrations:
+   ```bash
+   alembic upgrade head
+   ```
+
+3. Start the application:
+   ```bash
+   uvicorn main:app --reload
+   ```
+
+4. Open your browser and navigate to:
+   - API Documentation: http://localhost:8000/docs
+   - Alternative Documentation: http://localhost:8000/redoc
+   - Health Check: http://localhost:8000/health
+
+## API Endpoints
+
+### Base Routes
+- `GET /` - API information and links
+- `GET /health` - Health check endpoint
+
+### Task Management
+- `GET /api/v1/tasks` - Get all tasks (with pagination)
+- `GET /api/v1/tasks/{id}` - Get a specific task
+- `POST /api/v1/tasks` - Create a new task
+- `PUT /api/v1/tasks/{id}` - Update a task
+- `DELETE /api/v1/tasks/{id}` - Delete a task
+
+## Task Schema
+
+```json
+{
+  "title": "string",
+  "description": "string (optional)",
+  "completed": "boolean (default: false)",
+  "priority": "string (default: medium)",
+  "id": "integer (auto-generated)",
+  "created_at": "datetime (auto-generated)",
+  "updated_at": "datetime (auto-generated)"
+}
+```
+
+## Project Structure
+
+```
+├── main.py                 # FastAPI application entry point
+├── requirements.txt        # Python dependencies
+├── alembic.ini            # Alembic configuration
+├── alembic/               # Database migrations
+├── app/
+│   ├── db/
+│   │   ├── base.py        # SQLAlchemy Base
+│   │   └── session.py     # Database session management
+│   ├── models/
+│   │   └── task.py        # Task SQLAlchemy model
+│   ├── routers/
+│   │   └── tasks.py       # Task API endpoints
+│   └── schemas/
+│       └── task.py        # Pydantic schemas
+└── storage/
+    └── db/                # SQLite database storage
+```
+
+## Database
+
+The application uses SQLite for data storage. The database file is created automatically at `/app/storage/db/db.sqlite`.
+
+## Development
+
+The application is configured with:
+- CORS enabled for all origins
+- Automatic API documentation
+- Database migrations with Alembic
+- Pydantic models for request/response validation

alembic.ini

@@ -0,0 +1,41 @@
+[alembic]
+script_location = alembic
+prepend_sys_path = .
+version_path_separator = os
+sqlalchemy.url = sqlite:////app/storage/db/db.sqlite
+
+[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.stdout,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

alembic/env.py

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+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 +1,24 @@
+"""${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"}

alembic/versions/001_initial_task_table.py

@@ -0,0 +1,36 @@
+"""Initial task table
+
+Revision ID: 001
+Revises: 
+Create Date: 2024-01-01 00:00:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+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(length=200), nullable=False),
+        sa.Column('description', sa.Text(), nullable=True),
+        sa.Column('completed', sa.Boolean(), nullable=False),
+        sa.Column('priority', sa.String(length=20), nullable=False),
+        sa.Column('created_at', sa.DateTime(), nullable=False),
+        sa.Column('updated_at', sa.DateTime(), nullable=False),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index('ix_tasks_id', 'tasks', ['id'], unique=False)
+    op.create_index('ix_tasks_title', 'tasks', ['title'], unique=False)
+
+
+def downgrade() -> None:
+    op.drop_index('ix_tasks_title', table_name='tasks')
+    op.drop_index('ix_tasks_id', table_name='tasks')
+    op.drop_table('tasks')

app/db/base.py

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+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/task.py

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+from datetime import datetime
+from sqlalchemy import Column, Integer, String, Text, Boolean, DateTime
+from app.db.base import Base
+
+class Task(Base):
+    __tablename__ = "tasks"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String(200), nullable=False, index=True)
+    description = Column(Text, nullable=True)
+    completed = Column(Boolean, default=False, nullable=False)
+    priority = Column(String(20), default="medium", nullable=False)
+    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False)

app/routers/tasks.py

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+from typing import List
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+from app.db.session import get_db
+from app.models.task import Task
+from app.schemas.task import Task as TaskSchema, TaskCreate, TaskUpdate
+
+router = APIRouter()
+
+@router.get("/tasks", response_model=List[TaskSchema])
+def get_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 get_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.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.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/schemas/task.py

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+from datetime import datetime
+from typing import Optional
+from pydantic import BaseModel
+
+class TaskBase(BaseModel):
+    title: str
+    description: Optional[str] = None
+    completed: bool = False
+    priority: str = "medium"
+
+class TaskCreate(TaskBase):
+    pass
+
+class TaskUpdate(BaseModel):
+    title: Optional[str] = None
+    description: Optional[str] = None
+    completed: Optional[bool] = None
+    priority: Optional[str] = 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.routers import tasks
+
+app = FastAPI(
+    title="Task Manager API",
+    description="A simple task management 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", tags=["tasks"])
+
+@app.get("/")
+def read_root():
+    return {
+        "title": "Task Manager API",
+        "description": "A simple task management API built with FastAPI",
+        "version": "1.0.0",
+        "documentation": "/docs",
+        "health": "/health"
+    }
+
+@app.get("/health")
+def health_check():
+    return {
+        "status": "healthy",
+        "service": "Task Manager API",
+        "version": "1.0.0"
+    }

requirements.txt

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+fastapi==0.104.1
+uvicorn[standard]==0.24.0
+sqlalchemy==2.0.23
+alembic==1.12.1
+python-multipart==0.0.6
+pydantic==2.5.0
+ruff==0.1.6