nested_create.py 文件源码

def create(self, validated_data):
        reverse_relations = OrderedDict()
        relations = OrderedDict()

        # Sort fields by create priority
        fields = self.get_sorted_by_create_priority(self.fields)
        # Remove related fields from validated data for future manipulations
        for field_name, field in fields.items():
            if field.read_only or field_name in self._ignore_creation:
                continue

            if isinstance(field, serializers.ListSerializer):
                if isinstance(field.child, serializers.ModelSerializer):
                    if validated_data.pop(field.source, None) is None:
                        # Skip field if field is not required or null allowed
                        continue
                    reverse_relations[field_name] = field.child

            if isinstance(field, serializers.ModelSerializer):
                if validated_data.pop(field.source, None) is None:
                    # Skip field if field is not required or null allowed
                    continue
                relations[field_name] = field

        nested_related_kwarg = getattr(self.Meta, 'nested_related_kwarg', None)
        if reverse_relations:
            assert nested_related_kwarg, \
                "Set `nested_related_kwarg` in Meta options for use nested " \
                "create feature"

        # Create direct relations (foreign key)
        for field_name, field in relations.items():
            serializer = self._get_new_serializer(
                field, data=self.initial_data[field_name])
            serializer.is_valid(raise_exception=True)
            validated_data[field.source] = serializer.save()

        # Create instance
        instance = super(NestedCreateMixin, self).create(validated_data)
        if reverse_relations:
            self.create_reverse_relations(instance, reverse_relations)

        return instance