使用Flask-RESTful处理分层URI

Question

我想要一个如下所示的RESTful应用程序接口：

example.com/teams/
example.com/teams/<team_id>
example.com/teams/<team_id>/players
example.com/teams/<team_id>/players/<player_id>
...
example.com/teams/<team_id>/players/<player_id>/seasons/<season_id>/etc

其中每个URI都可以适当地处理GET和可能的POST。

我希望能够做到以下几点：

class Team(Resource):
    def post(self):
        #Handler for /teams/
    def post(self, team_id):
        #Handler for /teams/team_id
    def post(self, team_id, player_id):
        #Handler for /teams/team_id/players/player_id

并使用：

api.add_resource(Team, '/teams/', 'teams/<team_id>/players/<player_id>')

这将不起作用，因为后续的POST处理程序会覆盖以前的。

在URL中可能存在可变数量的变量(层次结构的可变深度)的情况下，使用Flask-RESTful处理API的正确方法是什么？

Answer 1

Python不支持这种特定方式的方法重载。在您的代码中，您并没有重载post()函数，而是在重新定义它

基本上，post()的最后一个定义是什么，它需要3个参数，如您所见：

class Team(Resource):
    def post(self, team_id, player_id):
        # This is the final definition of post()
        # The definitions above this one do not take effect

否则，很容易通过一个具有参数默认值的方法来获得行为：

class Team(Resource):
    def post(self, team_id=None, player_id=None):
        if team_id is None and player_id is None:
            # first version
        if team_id is not None and player_id is None:
            # second version 
        if team_id is not None and player_id is not None:
            # third version

对于您的URL，Flask将传入未在URL中定义的参数的None。