Method get_attribute

rest_framework/relations.py:532–561

(self, instance)

        ]

    def get_attribute(self, instance):
        # Can't have any relationships if not created
        if hasattr(instance, 'pk') and instance.pk is None:
            return []

        try:
            relationship = get_attribute(instance, self.source_attrs)
        except (KeyError, AttributeError) as exc:
            if self.default is not empty:
                return self.get_default()
            if self.allow_null:
                return None
            if not self.required:
                raise SkipField()
            msg = (
                'Got {exc_type} when attempting to get a value for field '
                '`{field}` on serializer `{serializer}`.\nThe serializer '
                'field might be named incorrectly and not match '
                'any attribute or key on the `{instance}` instance.\n'
                'Original exception text was: {exc}.'.format(
                    exc_type=type(exc).__name__,
                    field=self.field_name,
                    serializer=self.parent.__class__.__name__,
                    instance=instance.__class__.__name__,
                    exc=exc
                )
            )
            raise type(exc)(msg)

        return relationship.all() if hasattr(relationship, 'all') else relationship

    def to_representation(self, iterable):
        return [