serializers.py 文件源码

def __init__(self, field, parent, only_fields, include_fields):
        self.field = field
        self.parent = parent
        self.is_many = isinstance(field, serializers.ListSerializer) and isinstance(field.child, serializers.Serializer)
        self.has_context = isinstance(field, serializers.Serializer) or self.is_many
        if self.has_context:
            self.old_context = None
            self.only_fields = self.filter_fields(field.field_name, only_fields)
            self.include_fields = self.filter_fields(field.field_name, include_fields)
            self.on_exit_delete_fields = False
            self.on_exit_delete_include_fields = False
            self.old_fields = None
            self.old_include_fields = None