relations.py 文件源码

def __init__(self, *args, **kwargs):
        queryset = kwargs.pop('queryset', None)
        self.many = kwargs.pop('many', self.many)
        if self.many:
            self.widget = self.many_widget
            self.form_field_class = self.many_form_field_class

        kwargs['read_only'] = kwargs.pop('read_only', self.read_only)
        super(RelatedField, self).__init__(*args, **kwargs)

        if not self.required:
            # Accessed in ModelChoiceIterator django/forms/models.py:1034
            # If set adds empty choice.
            self.empty_label = BLANK_CHOICE_DASH[0][1]

        self.queryset = queryset