main.py

import json
from typing import List

from fastapi import FastAPI, Query, Path, HTTPException
from starlette.responses import JSONResponse

from models import TodoItem


app = FastAPI()

# temporary until a real DB is in place
with open('todos.json') as f:
    TODOS = json.load(f)


@app.exception_handler(Exception)
async def error_handler(request, exc):
    return JSONResponse({
        'detail': f'{exc}'
    })


@app.get(
    '/todos',
    summary='Get a list of todo items',
    tags=['todos'],
    response_model=List[TodoItem],
)
async def get_todos(
    limit: int = Query(None, description='Limit the number of items returned', le=100)
):
    """Get a list of things to do"""
    return TODOS[0:limit]


@app.get(
    '/todos/{todo_id}',
    summary='Get a single todo item',
    tags=['todos'],
    response_model=TodoItem,
)
async def get_todo(
    todo_id: int = Path(..., description='A todo item ID number to lookup')
):
    """Get a single to do item"""
    try:
        return TODOS[todo_id - 1]
    except IndexError:
        raise HTTPException(404, 'Todo item not found')


@app.post(
    '/todos',
    summary='Add a todo item',
    tags=['todos'],
    status_code=201,
    response_model=TodoItem,
)
async def create_todo(todo: TodoItem):
    item = todo.dict()
    item['id'] = len(TODOS) + 1
    return item