Implement comprehensive Task Manager API with FastAPI and SQLite

- Add complete CRUD operations for task management
- Implement task filtering by status, priority, and search
- Add task statistics endpoint for summary data
- Configure SQLite database with Alembic migrations
- Set up FastAPI with CORS support and API documentation
- Include health check endpoint and base URL information
- Add comprehensive README with API usage examples
- Structure project with proper separation of concerns

README.md

@@ -1,3 +1,173 @@
-# FastAPI Application
+# Task Manager API
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A comprehensive Task Manager API built with FastAPI and SQLite, providing full CRUD operations for task management with filtering, search, and statistics capabilities.
+
+## Features
+
+- ✅ **Task Management**: Create, read, update, and delete tasks
+- 🔍 **Advanced Filtering**: Filter tasks by status, priority, and search text
+- 📊 **Statistics**: Get task count summaries by status
+- 🚀 **FastAPI Framework**: Modern, fast web framework with automatic API documentation
+- 💾 **SQLite Database**: Lightweight, serverless database with Alembic migrations
+- 📝 **Comprehensive API Documentation**: Auto-generated OpenAPI/Swagger docs
+- 🌐 **CORS Support**: Cross-origin resource sharing enabled
+- ⚡ **Health Checks**: Built-in health monitoring endpoint
+
+## Task Properties
+
+Each task includes:
+- **Title**: Task name (required, max 255 characters)
+- **Description**: Optional detailed description
+- **Status**: `pending`, `in_progress`, or `completed`
+- **Priority**: `low`, `medium`, or `high`
+- **Due Date**: Optional deadline
+- **Timestamps**: Auto-generated creation and update times
+
+## API Endpoints
+
+### Tasks
+- `GET /tasks/` - List all tasks with optional filtering
+- `POST /tasks/` - Create a new task
+- `GET /tasks/{id}` - Get a specific task
+- `PUT /tasks/{id}` - Update a task
+- `DELETE /tasks/{id}` - Delete a task
+- `GET /tasks/stats/summary` - Get task statistics
+
+### System
+- `GET /` - API information and links
+- `GET /health` - Health check endpoint
+- `GET /docs` - Interactive API documentation (Swagger UI)
+- `GET /redoc` - Alternative API documentation
+- `GET /openapi.json` - OpenAPI schema
+
+## Quick Start
+
+1. **Install Dependencies**
+   ```bash
+   pip install -r requirements.txt
+   ```
+
+2. **Run Database Migrations**
+   ```bash
+   alembic upgrade head
+   ```
+
+3. **Start the Server**
+   ```bash
+   uvicorn main:app --reload
+   ```
+
+4. **Access the Application**
+   - API: http://localhost:8000
+   - Documentation: http://localhost:8000/docs
+   - Health Check: http://localhost:8000/health
+
+## API Usage Examples
+
+### Create a Task
+```bash
+curl -X POST "http://localhost:8000/tasks/" \
+     -H "Content-Type: application/json" \
+     -d '{
+       "title": "Complete project documentation",
+       "description": "Write comprehensive README and API docs",
+       "priority": "high",
+       "status": "pending"
+     }'
+```
+
+### Get All Tasks
+```bash
+curl "http://localhost:8000/tasks/"
+```
+
+### Filter Tasks
+```bash
+# Get high priority tasks
+curl "http://localhost:8000/tasks/?priority=high"
+
+# Get completed tasks
+curl "http://localhost:8000/tasks/?status=completed"
+
+# Search tasks
+curl "http://localhost:8000/tasks/?search=documentation"
+```
+
+### Update a Task
+```bash
+curl -X PUT "http://localhost:8000/tasks/1" \
+     -H "Content-Type: application/json" \
+     -d '{
+       "status": "completed"
+     }'
+```
+
+### Get Task Statistics
+```bash
+curl "http://localhost:8000/tasks/stats/summary"
+```
+
+## Database
+
+The application uses SQLite with the following configuration:
+- **Database Location**: `/app/storage/db/db.sqlite`
+- **Migration Tool**: Alembic
+- **Schema Management**: Automatic table creation and migrations
+
+## Environment Variables
+
+Currently, no environment variables are required. The application uses SQLite with a fixed path for simplicity.
+
+## Project Structure
+
+```
+/
+├── main.py                 # FastAPI application entry point
+├── requirements.txt        # Python dependencies
+├── alembic.ini            # Alembic configuration
+├── alembic/               # Database migrations
+│   ├── env.py
+│   └── versions/
+├── app/
+│   ├── api/
+│   │   └── tasks.py       # Task API routes
+│   ├── crud/
+│   │   └── task.py        # Database operations
+│   ├── db/
+│   │   ├── base.py        # SQLAlchemy base
+│   │   └── session.py     # Database connection
+│   ├── models/
+│   │   └── task.py        # Database models
+│   └── schemas/
+│       └── task.py        # Pydantic schemas
+└── storage/
+    └── db/                # SQLite database files
+```
+
+## Development Commands
+
+```bash
+# Install dependencies
+pip install -r requirements.txt
+
+# Run migrations
+alembic upgrade head
+
+# Start development server
+uvicorn main:app --reload --host 0.0.0.0 --port 8000
+
+# Run linting
+python -m ruff check . --fix
+```
+
+## Technologies Used
+
+- **FastAPI**: Modern Python web framework
+- **SQLAlchemy**: SQL toolkit and ORM
+- **Alembic**: Database migration tool
+- **Pydantic**: Data validation using Python type hints
+- **SQLite**: Lightweight database
+- **Uvicorn**: ASGI server
+- **Ruff**: Fast Python linter
+
+Built with BackendIM - AI-powered backend development assistant.

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.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

alembic/env.py

@@ -0,0 +1,53 @@
+from logging.config import fileConfig
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+from alembic import context
+import os
+import sys
+
+sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from app.db.base import Base
+from app.models.task import Task
+
+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_create_tasks_table.py

@@ -0,0 +1,37 @@
+"""create tasks 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=255), nullable=False),
+        sa.Column('description', sa.Text(), nullable=True),
+        sa.Column('status', sa.Enum('PENDING', 'IN_PROGRESS', 'COMPLETED', name='taskstatus'), nullable=False),
+        sa.Column('priority', sa.Enum('LOW', 'MEDIUM', 'HIGH', name='taskpriority'), nullable=False),
+        sa.Column('due_date', sa.DateTime(), nullable=True),
+        sa.Column('created_at', sa.DateTime(), nullable=False),
+        sa.Column('updated_at', sa.DateTime(), nullable=False),
+        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

@@ -0,0 +1,73 @@
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy.orm import Session
+from typing import List, Optional
+from app.crud import task as crud_task
+from app.schemas.task import TaskCreate, TaskUpdate, TaskResponse
+from app.models.task import TaskStatus, TaskPriority
+from app.db.session import get_db
+
+router = APIRouter()
+
+
+@router.get("/", response_model=List[TaskResponse])
+def read_tasks(
+    skip: int = Query(0, ge=0, description="Number of tasks to skip"),
+    limit: int = Query(100, ge=1, le=1000, description="Maximum number of tasks to return"),
+    status: Optional[TaskStatus] = Query(None, description="Filter by task status"),
+    priority: Optional[TaskPriority] = Query(None, description="Filter by task priority"),
+    search: Optional[str] = Query(None, description="Search in title and description"),
+    db: Session = Depends(get_db)
+):
+    tasks = crud_task.get_tasks(
+        db=db, 
+        skip=skip, 
+        limit=limit, 
+        status=status, 
+        priority=priority, 
+        search=search
+    )
+    return tasks
+
+
+@router.post("/", response_model=TaskResponse)
+def create_task(task: TaskCreate, db: Session = Depends(get_db)):
+    return crud_task.create_task(db=db, task=task)
+
+
+@router.get("/{task_id}", response_model=TaskResponse)
+def read_task(task_id: int, db: Session = Depends(get_db)):
+    db_task = crud_task.get_task(db=db, task_id=task_id)
+    if db_task is None:
+        raise HTTPException(status_code=404, detail="Task not found")
+    return db_task
+
+
+@router.put("/{task_id}", response_model=TaskResponse)
+def update_task(task_id: int, task: TaskUpdate, db: Session = Depends(get_db)):
+    db_task = crud_task.update_task(db=db, task_id=task_id, task_update=task)
+    if db_task is None:
+        raise HTTPException(status_code=404, detail="Task not found")
+    return db_task
+
+
+@router.delete("/{task_id}")
+def delete_task(task_id: int, db: Session = Depends(get_db)):
+    success = crud_task.delete_task(db=db, task_id=task_id)
+    if not success:
+        raise HTTPException(status_code=404, detail="Task not found")
+    return {"message": "Task deleted successfully"}
+
+
+@router.get("/stats/summary")
+def get_task_stats(db: Session = Depends(get_db)):
+    total_tasks = crud_task.get_tasks_count(db=db)
+    pending_tasks = crud_task.get_tasks_by_status_count(db=db, status=TaskStatus.PENDING)
+    in_progress_tasks = crud_task.get_tasks_by_status_count(db=db, status=TaskStatus.IN_PROGRESS)
+    completed_tasks = crud_task.get_tasks_by_status_count(db=db, status=TaskStatus.COMPLETED)
+    
+    return {
+        "total_tasks": total_tasks,
+        "pending_tasks": pending_tasks,
+        "in_progress_tasks": in_progress_tasks,
+        "completed_tasks": completed_tasks
+    }

app/crud/task.py

@@ -0,0 +1,76 @@
+from sqlalchemy.orm import Session
+from sqlalchemy import or_
+from typing import List, Optional
+from app.models.task import Task, TaskStatus, TaskPriority
+from app.schemas.task import TaskCreate, TaskUpdate
+
+
+def get_task(db: Session, task_id: int) -> Optional[Task]:
+    return db.query(Task).filter(Task.id == task_id).first()
+
+
+def get_tasks(
+    db: Session, 
+    skip: int = 0, 
+    limit: int = 100,
+    status: Optional[TaskStatus] = None,
+    priority: Optional[TaskPriority] = None,
+    search: Optional[str] = None
+) -> List[Task]:
+    query = db.query(Task)
+    
+    if status:
+        query = query.filter(Task.status == status)
+    
+    if priority:
+        query = query.filter(Task.priority == priority)
+    
+    if search:
+        query = query.filter(
+            or_(
+                Task.title.contains(search),
+                Task.description.contains(search)
+            )
+        )
+    
+    return query.offset(skip).limit(limit).all()
+
+
+def create_task(db: Session, task: TaskCreate) -> Task:
+    db_task = Task(**task.dict())
+    db.add(db_task)
+    db.commit()
+    db.refresh(db_task)
+    return db_task
+
+
+def update_task(db: Session, task_id: int, task_update: TaskUpdate) -> Optional[Task]:
+    db_task = db.query(Task).filter(Task.id == task_id).first()
+    if not db_task:
+        return None
+    
+    update_data = task_update.dict(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(db: Session, task_id: int) -> bool:
+    db_task = db.query(Task).filter(Task.id == task_id).first()
+    if not db_task:
+        return False
+    
+    db.delete(db_task)
+    db.commit()
+    return True
+
+
+def get_tasks_count(db: Session) -> int:
+    return db.query(Task).count()
+
+
+def get_tasks_by_status_count(db: Session, status: TaskStatus) -> int:
+    return db.query(Task).filter(Task.status == status).count()

app/db/base.py

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

app/db/session.py

@@ -0,0 +1,23 @@
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+from pathlib import Path
+
+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 +1,29 @@
+from sqlalchemy import Column, Integer, String, DateTime, Enum, Text
+from sqlalchemy.sql import func
+import enum
+from app.db.base import Base
+
+
+class TaskStatus(str, enum.Enum):
+    PENDING = "pending"
+    IN_PROGRESS = "in_progress"
+    COMPLETED = "completed"
+
+
+class TaskPriority(str, enum.Enum):
+    LOW = "low"
+    MEDIUM = "medium"
+    HIGH = "high"
+
+
+class Task(Base):
+    __tablename__ = "tasks"
+
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String(255), nullable=False, index=True)
+    description = Column(Text, nullable=True)
+    status = Column(Enum(TaskStatus), default=TaskStatus.PENDING, nullable=False)
+    priority = Column(Enum(TaskPriority), default=TaskPriority.MEDIUM, nullable=False)
+    due_date = Column(DateTime, nullable=True)
+    created_at = Column(DateTime, default=func.now(), nullable=False)
+    updated_at = Column(DateTime, default=func.now(), onupdate=func.now(), nullable=False)

app/schemas/task.py

@@ -0,0 +1,33 @@
+from pydantic import BaseModel, Field
+from datetime import datetime
+from typing import Optional
+from app.models.task import TaskStatus, TaskPriority
+
+
+class TaskBase(BaseModel):
+    title: str = Field(..., min_length=1, max_length=255, description="Task title")
+    description: Optional[str] = Field(None, description="Task description")
+    status: TaskStatus = Field(TaskStatus.PENDING, description="Task status")
+    priority: TaskPriority = Field(TaskPriority.MEDIUM, description="Task priority")
+    due_date: Optional[datetime] = Field(None, description="Task due date")
+
+
+class TaskCreate(TaskBase):
+    pass
+
+
+class TaskUpdate(BaseModel):
+    title: Optional[str] = Field(None, min_length=1, max_length=255, description="Task title")
+    description: Optional[str] = Field(None, description="Task description")
+    status: Optional[TaskStatus] = Field(None, description="Task status")
+    priority: Optional[TaskPriority] = Field(None, description="Task priority")
+    due_date: Optional[datetime] = Field(None, description="Task due date")
+
+
+class TaskResponse(TaskBase):
+    id: int
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True

lint.py

@@ -0,0 +1,12 @@
+import subprocess
+import sys
+
+try:
+    result = subprocess.run([sys.executable, "-m", "ruff", "check", ".", "--fix"], 
+                          capture_output=True, text=True)
+    print("STDOUT:", result.stdout)
+    if result.stderr:
+        print("STDERR:", result.stderr)
+    print("Return code:", result.returncode)
+except Exception as e:
+    print(f"Error running ruff: {e}")

main.py

@@ -0,0 +1,46 @@
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from app.api import tasks
+from app.db.session import engine
+from app.db.base import Base
+
+app = FastAPI(
+    title="Task Manager API",
+    description="A comprehensive Task Manager 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=["*"],
+)
+
+Base.metadata.create_all(bind=engine)
+
+app.include_router(tasks.router, prefix="/tasks", tags=["tasks"])
+
+
+@app.get("/")
+def read_root():
+    return {
+        "title": "Task Manager API",
+        "description": "A comprehensive Task Manager API built with FastAPI",
+        "version": "1.0.0",
+        "documentation": "/docs",
+        "health_check": "/health"
+    }
+
+
+@app.get("/health")
+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
+pydantic==2.5.0
+python-multipart==0.0.6
+ruff==0.1.6