Simple Todo Application

A simple RESTful API for managing todos built with FastAPI, SQLAlchemy, and SQLite.

Features

• Create, Read, Update, Delete todo items
• Filter todos by completion status
• Proper error handling and validation
• API documentation via Swagger UI
• SQLite database for persistence
• Database migrations using Alembic

Project Structure

simpletodoapplication/
├── alembic/               # Database migration scripts
├── app/                   # Application package
│   ├── api/               # API endpoints
│   │   └── routers/       # API routers
│   ├── core/              # Core functionality
│   ├── db/                # Database session and connection
│   ├── models/            # SQLAlchemy models
│   └── schemas/           # Pydantic schemas
├── alembic.ini            # Alembic configuration
├── main.py                # Application entry point
└── requirements.txt       # Project dependencies

Setup

1. Clone the repository:

git clone <repository-url>
cd simpletodoapplication

2. Install dependencies:

pip install -r requirements.txt

3. Apply database migrations:

alembic upgrade head

4. Run the application:

uvicorn main:app --reload

The API server will be running at http://localhost:8000.

API Documentation

Once the server is running, you can access the auto-generated API documentation:

• Swagger UI: http://localhost:8000/docs
• ReDoc: http://localhost:8000/redoc

API Endpoints

• GET /api/v1/todos: Get all todos

  • Query Parameters:
    • skip: Number of items to skip (default: 0)
    • limit: Maximum number of items to return (default: 100)
    • completed: Filter by completion status (boolean, optional)

• POST /api/v1/todos: Create a new todo

  • Request Body:
    • title: String (required)
    • description: String (optional)
    • completed: Boolean (default: false)

• GET /api/v1/todos/{todo_id}: Get a specific todo by ID

• PUT /api/v1/todos/{todo_id}: Update a todo

  • Request Body (all fields optional):
    • title: String
    • description: String
    • completed: Boolean

• DELETE /api/v1/todos/{todo_id}: Delete a todo

• GET /health: Health check endpoint

Example Requests

Create a Todo

curl -X 'POST' \
  'http://localhost:8000/api/v1/todos/' \
  -H 'accept: application/json' \
  -H 'Content-Type: application/json' \
  -d '{
  "title": "Buy groceries",
  "description": "Milk, eggs, bread",
  "completed": false
}'

Get All Todos

curl -X 'GET' \
  'http://localhost:8000/api/v1/todos/' \
  -H 'accept: application/json'

Get Only Completed Todos

curl -X 'GET' \
  'http://localhost:8000/api/v1/todos/?completed=true' \
  -H 'accept: application/json'

Update a Todo

curl -X 'PUT' \
  'http://localhost:8000/api/v1/todos/1' \
  -H 'accept: application/json' \
  -H 'Content-Type: application/json' \
  -d '{
  "completed": true
}'

Delete a Todo

curl -X 'DELETE' \
  'http://localhost:8000/api/v1/todos/1' \
  -H 'accept: application/json'