Add Task Manager API with FastAPI and SQLite

- Created comprehensive task management system with CRUD operations
- Implemented SQLAlchemy models and database configuration
- Added Alembic migrations for database schema management
- Created FastAPI endpoints for task management with proper validation
- Added health check endpoint and base URL information
- Configured CORS middleware and OpenAPI documentation
- Updated README with comprehensive API documentation
- Code formatted and linted with Ruff

README.md

@@ -1,3 +1,96 @@
-# FastAPI Application
+# Task Manager API
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A simple and efficient task management API built with FastAPI and SQLite.
+
+## Features
+
+- Create, read, update, and delete tasks
+- Filter tasks by completion status
+- Filter tasks by priority level
+- Automatic timestamps for task creation and updates
+- SQLite database with SQLAlchemy ORM
+- Database migrations with Alembic
+- Interactive API documentation with Swagger UI
+- Health check endpoint
+- CORS support for cross-origin requests
+
+## Installation
+
+1. Clone the repository
+2. Install dependencies:
+   ```bash
+   pip install -r requirements.txt
+   ```
+
+3. Run the application:
+   ```bash
+   uvicorn main:app --reload
+   ```
+
+## API Endpoints
+
+### Base Information
+- `GET /` - API information and available endpoints
+- `GET /health` - Health check endpoint
+
+### Task Management
+- `POST /api/v1/tasks` - Create a new task
+- `GET /api/v1/tasks` - List all tasks (with optional filtering)
+- `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
+- `GET /api/v1/tasks/priority/{priority}` - Get tasks by priority
+
+### Query Parameters
+- `skip` - Number of tasks to skip (pagination)
+- `limit` - Maximum number of tasks to return
+- `completed` - Filter by completion status (true/false)
+
+## Task Schema
+
+```json
+{
+  "id": 1,
+  "title": "Example Task",
+  "description": "Task description",
+  "completed": false,
+  "priority": "medium",
+  "created_at": "2024-01-01T00:00:00",
+  "updated_at": "2024-01-01T00:00:00",
+  "due_date": "2024-01-02T00:00:00"
+}
+```
+
+## Priority Levels
+- `low`
+- `medium`
+- `high`
+
+## Database
+
+The application uses SQLite as the database, stored in `/app/storage/db/db.sqlite`. The database schema is managed using Alembic migrations.
+
+## API Documentation
+
+Once the application is running, you can access:
+- Swagger UI: `http://localhost:8000/docs`
+- ReDoc: `http://localhost:8000/redoc`
+- OpenAPI JSON: `http://localhost:8000/openapi.json`
+
+## Development
+
+### Running with uvicorn
+```bash
+uvicorn main:app --reload --host 0.0.0.0 --port 8000
+```
+
+### Database Migrations
+The application automatically creates the database tables on startup. Migration files are located in the `alembic/versions/` directory.
+
+## Health Check
+
+The API provides a health check endpoint at `/health` that returns the current status of the service.
+
+## CORS Configuration
+
+The API is configured to allow all origins for development purposes. In production, you should restrict this to specific domains.

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 +1,49 @@
+from logging.config import fileConfig
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+from alembic import context
+import sys
+import os
+
+sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+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 +1,39 @@
+"""Create 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=10), nullable=False),
+        sa.Column("created_at", sa.DateTime(), nullable=False),
+        sa.Column("updated_at", sa.DateTime(), nullable=False),
+        sa.Column("due_date", sa.DateTime(), nullable=True),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index(op.f("ix_tasks_id"), "tasks", ["id"], unique=False)
+    op.create_index(op.f("ix_tasks_title"), "tasks", ["title"], unique=False)
+
+
+def downgrade() -> None:
+    op.drop_index(op.f("ix_tasks_title"), table_name="tasks")
+    op.drop_index(op.f("ix_tasks_id"), table_name="tasks")
+    op.drop_table("tasks")

app/api/tasks.py

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+from typing import List, Optional
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy.orm import Session
+from app.db.session import get_db
+from app.crud import task_crud
+from app.schemas.task import TaskCreate, TaskUpdate, TaskResponse
+
+router = APIRouter()
+
+
+@router.post("/tasks", response_model=TaskResponse, status_code=201)
+def create_task(task: TaskCreate, db: Session = Depends(get_db)):
+    return task_crud.create_task(db=db, task=task)
+
+
+@router.get("/tasks", response_model=List[TaskResponse])
+def get_tasks(
+    skip: int = Query(0, ge=0),
+    limit: int = Query(100, ge=1, le=1000),
+    completed: Optional[bool] = Query(None),
+    db: Session = Depends(get_db),
+):
+    return task_crud.get_tasks(db=db, skip=skip, limit=limit, completed=completed)
+
+
+@router.get("/tasks/{task_id}", response_model=TaskResponse)
+def get_task(task_id: int, db: Session = Depends(get_db)):
+    db_task = task_crud.get_task(db=db, task_id=task_id)
+    if not db_task:
+        raise HTTPException(status_code=404, detail="Task not found")
+    return db_task
+
+
+@router.put("/tasks/{task_id}", response_model=TaskResponse)
+def update_task(task_id: int, task_update: TaskUpdate, db: Session = Depends(get_db)):
+    db_task = task_crud.update_task(db=db, task_id=task_id, task_update=task_update)
+    if not db_task:
+        raise HTTPException(status_code=404, detail="Task not found")
+    return db_task
+
+
+@router.delete("/tasks/{task_id}", status_code=204)
+def delete_task(task_id: int, db: Session = Depends(get_db)):
+    success = task_crud.delete_task(db=db, task_id=task_id)
+    if not success:
+        raise HTTPException(status_code=404, detail="Task not found")
+
+
+@router.get("/tasks/priority/{priority}", response_model=List[TaskResponse])
+def get_tasks_by_priority(priority: str, db: Session = Depends(get_db)):
+    return task_crud.get_tasks_by_priority(db=db, priority=priority)

app/crud.py

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+from typing import List, Optional
+from sqlalchemy.orm import Session
+from app.models.task import Task
+from app.schemas.task import TaskCreate, TaskUpdate
+
+
+class TaskCRUD:
+    def create_task(self, db: Session, task: TaskCreate) -> Task:
+        db_task = Task(**task.model_dump())
+        db.add(db_task)
+        db.commit()
+        db.refresh(db_task)
+        return db_task
+
+    def get_task(self, db: Session, task_id: int) -> Optional[Task]:
+        return db.query(Task).filter(Task.id == task_id).first()
+
+    def get_tasks(
+        self,
+        db: Session,
+        skip: int = 0,
+        limit: int = 100,
+        completed: Optional[bool] = None,
+    ) -> List[Task]:
+        query = db.query(Task)
+        if completed is not None:
+            query = query.filter(Task.completed == completed)
+        return query.offset(skip).limit(limit).all()
+
+    def update_task(
+        self, db: Session, task_id: int, task_update: TaskUpdate
+    ) -> Optional[Task]:
+        db_task = self.get_task(db, task_id)
+        if not db_task:
+            return None
+
+        update_data = task_update.model_dump(exclude_unset=True)
+        for field, value in update_data.items():
+            setattr(db_task, field, value)
+
+        db.commit()
+        db.refresh(db_task)
+        return db_task
+
+    def delete_task(self, db: Session, task_id: int) -> bool:
+        db_task = self.get_task(db, task_id)
+        if not db_task:
+            return False
+
+        db.delete(db_task)
+        db.commit()
+        return True
+
+    def get_tasks_by_priority(self, db: Session, priority: str) -> List[Task]:
+        return db.query(Task).filter(Task.priority == priority).all()
+
+
+task_crud = TaskCRUD()

app/db/base.py

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+from sqlalchemy.ext.declarative import declarative_base
+
+Base = declarative_base()

app/db/session.py

@@ -0,0 +1,22 @@
+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

@@ -0,0 +1,18 @@
+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(10), 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
+    )
+    due_date = Column(DateTime, nullable=True)

app/schemas/task.py

@@ -0,0 +1,32 @@
+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"
+    due_date: Optional[datetime] = None
+
+
+class TaskCreate(TaskBase):
+    pass
+
+
+class TaskUpdate(BaseModel):
+    title: Optional[str] = None
+    description: Optional[str] = None
+    completed: Optional[bool] = None
+    priority: Optional[str] = None
+    due_date: Optional[datetime] = None
+
+
+class TaskResponse(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.tasks import router as tasks_router
+from app.db.session import engine
+from app.db.base import Base
+
+Base.metadata.create_all(bind=engine)
+
+app = FastAPI(
+    title="Task Manager API",
+    description="A simple task management API built with FastAPI",
+    version="1.0.0",
+    openapi_url="/openapi.json",
+    docs_url="/docs",
+    redoc_url="/redoc",
+)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+app.include_router(tasks_router, prefix="/api/v1")
+
+
+@app.get("/")
+async def root():
+    return {
+        "title": "Task Manager API",
+        "description": "A simple task management API built with FastAPI",
+        "version": "1.0.0",
+        "documentation": "/docs",
+        "health_check": "/health",
+    }
+
+
+@app.get("/health")
+async def health_check():
+    return {"status": "healthy", "service": "Task Manager API", "version": "1.0.0"}

requirements.txt

@@ -0,0 +1,7 @@
+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