使用Flask-Restless为SQLAlchemy表创建API

Question

我使用Python，Flask，Flask-SQLAlchemy和Flask-Restless创建一个RESTful API。该数据库包含一个表user。每个用户可以关注其他用户，每个用户可以跟随其他用户（如Twitter）。所以我也有一个表followers来链接用户（我部分跟着Miguel's tutorial）。这是我的代码：

# -*- coding: utf-8 -*- 
from flask import Flask 

from flask.ext.sqlalchemy import SQLAlchemy 
from flask.ext.restless import APIManager 

# Create the Flask application and the Flask-SQLAlchemy object. 
app = Flask(__name__) 
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:////tmp/test.db' 
db = SQLAlchemy(app) 

followers = db.Table('followers', 
    db.Column('follower_id', db.Integer, db.ForeignKey('user.id'), nullable=False), 
    db.Column('followed_id', db.Integer, db.ForeignKey('user.id'), nullable=False) 
) 

# Model declaration 
class User(db.Model): 
    id = db.Column(db.Integer, primary_key=True) 
    name = db.Column(db.Unicode, nullable=False) 
    # some other properties... 
    followed = db.relationship('User', 
     secondary=followers, 
     primaryjoin=(followers.c.follower_id == id), 
     secondaryjoin=(followers.c.followed_id == id), 
     backref=db.backref('followers', lazy='dynamic'), 
     lazy='dynamic') 

# Create the database tables. 
db.create_all() 

# Create the Flask-Restless API manager. 
manager = APIManager(app, flask_sqlalchemy_db=db) 

# Create API endpoints, which will be available at /api/<tablename> by 
# default. Allowed HTTP methods can be specified as well. 
manager.create_api(User, methods=['GET', 'POST']) 

if __name__ == '__main__': 
    app.run(debug=True) 

要添加到数据库的新用户是很容易：

from requests import post 

user = {'name':'John Doe'} 
post('http://localhost:5000/api/user', json=user) 

但我应该做的是什么样的要求，在followers表中添加的东西吗？

Answer 1

您需要使用PATCH。

从这个docs：

PATCH /api/person/1 

HTTP/1.1 Host: example.com 

    { "computers": 
     { 
     "add": [ {"id": 1} ] 
     } 
    } 

在你的情况，你会做这样的事情：

from requests import patch 

follower = {'id':'37'} 
cmd = {'followed': { 'add': [ follower ] } } 
patch('http://localhost:5000/api/user/1', json=cmd)