Django第一个请求的流程

首先验证中间件中含User.objects.get(username=username)

然后大致按照如下调用过程(这里只列出调用的关键点函数,调用于被调用关系用缩进表示) 

models.manager.get
        self.get_query_set().get(
            self.filter(*args, **kwargs)
                models.sql.query    
                add_q
                    add_filter
                        self.setup_joins
                            models.option    opts.get_field_by_name(name)
                                                    cache = self.init_name_map()
                                                        self.get_all_related_m2m_objects_with_model()
                                                                    for klass in get_models()
                                                                            self._populate()
                                                                                for app_name in settings.INSTALLED_APPS:
                                                                                    if app_name in self.handled:
                                                                                        continue
                                                                                    self.load_app(app_name, True)