การสร้างปลายทาง REST

REST API คืออะไร

from flask import Flask, jsonify
app = Flask(__name__)
# REST endpoints return data, not pages
print('REST APIs speak JSON over HTTP')

การส่งคืน JSON

from flask import Flask, jsonify
app = Flask(__name__)

@app.route('/api/status')
def status():
    return jsonify({'status': 'ok'})
print('jsonify builds a JSON response')

การแปลงพจนานุกรมโดยอัตโนมัติ

from flask import Flask
app = Flask(__name__)

@app.route('/api/ping')
def ping():
    return {'message': 'pong'}
print('Returning a dict yields JSON')

การส่งคืนรายการ

from flask import Flask, jsonify
app = Flask(__name__)
books = [{'id': 1, 'title': 'A'}, {'id': 2, 'title': 'B'}]

@app.route('/api/books')
def list_books():
    return jsonify(books)
print('Return a list of resources')

GET ทรัพยากรหนึ่งรายการ

from flask import Flask, jsonify
app = Flask(__name__)
books = {1: {'id': 1, 'title': 'A'}}

@app.route('/api/books/<int:bid>')
def get_book(bid):
    book = books.get(bid)
    if book is None:
        return jsonify({'error': 'not found'}), 404
    return jsonify(book)
print('GET /api/books/1')

การสร้างด้วย POST

from flask import Flask, request, jsonify
app = Flask(__name__)
books = []

@app.route('/api/books', methods=['POST'])
def create_book():
    data = request.get_json()
    book = {'id': len(books) + 1, 'title': data['title']}
    books.append(book)
    return jsonify(book), 201
print('POST creates and returns 201')

การอัปเดตด้วย PUT

from flask import Flask, request, jsonify
app = Flask(__name__)
books = {1: {'id': 1, 'title': 'A'}}

@app.route('/api/books/<int:bid>', methods=['PUT'])
def update_book(bid):
    if bid not in books:
        return jsonify({'error': 'not found'}), 404
    books[bid]['title'] = request.get_json()['title']
    return jsonify(books[bid])
print('PUT updates a resource')

การลบด้วย DELETE

from flask import Flask, jsonify
app = Flask(__name__)
books = {1: {'id': 1, 'title': 'A'}}

@app.route('/api/books/<int:bid>', methods=['DELETE'])
def delete_book(bid):
    if bid in books:
        del books[bid]
        return '', 204
    return jsonify({'error': 'not found'}), 404
print('DELETE removes a resource')

รหัสสถานะมีความสำคัญ

# 200 success
# 201 created
# 204 no content
# 400 bad request
# 404 not found
print('Use the right status code')

การตรวจสอบเนื้อหา

from flask import Flask, request, jsonify
app = Flask(__name__)

@app.route('/api/books', methods=['POST'])
def create_book():
    data = request.get_json(silent=True) or {}
    if 'title' not in data:
        return jsonify({'error': 'title required'}), 400
    return jsonify(data), 201
print('Validate JSON before using it')

การตอบกลับที่สอดคล้องกัน

from flask import jsonify
# Success: {'data': {...}}
# Error:   {'error': 'message'}
# Keep the shape consistent across endpoints
print('Predictable shapes help clients')

ตรวจสอบความเข้าใจ

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