fields.py 文件源码

def add_to_class(self, model_class, name):
        if isinstance(self._through_model, Proxy):
            def callback(through_model):
                self._through_model = through_model
                self.add_to_class(model_class, name)
            self._through_model.attach_callback(callback)
            return
        elif isinstance(self._through_model, DeferredThroughModel):
            self._through_model.set_field(model_class, self, name)
            return

        self.name = name
        self.model_class = model_class
        if not self.verbose_name:
            self.verbose_name = re.sub('_+', ' ', name).title()
        setattr(model_class, name, self._get_descriptor())

        if not self._is_backref:
            backref = AioManyToManyField(
                self.model_class,
                through_model=self._through_model,
                _is_backref=True)
            related_name = self._related_name or model_class._meta.name + 's'
            backref.add_to_class(self.rel_model, related_name)