Method resolve_attributes_lookup

haystack/fields.py:117–161

Recursive method that looks, for one or more objects, for an attribute that can be multiple objects (relations) deep.

(self, current_objects, attributes)

            return None

    def resolve_attributes_lookup(self, current_objects, attributes):
        """
        Recursive method that looks, for one or more objects, for an attribute that can be multiple
        objects (relations) deep.
        """
        values = []

        for current_object in current_objects:
            if not hasattr(current_object, attributes[0]):
                raise SearchFieldError(
                    "The model '%r' does not have a model_attr '%s'."
                    % (repr(current_object), attributes[0])
                )

            if len(attributes) > 1:
                current_objects_in_attr = self.get_iterable_objects(
                    getattr(current_object, attributes[0])
                )
                values.extend(
                    self.resolve_attributes_lookup(
                        current_objects_in_attr, attributes[1:]
                    )
                )
                continue

            current_object = getattr(current_object, attributes[0])

            if current_object is None:
                if self.has_default():
                    current_object = self._default
                elif self.null:
                    current_object = None
                else:
                    raise SearchFieldError(
                        "The model '%s' combined with model_attr '%s' returned None, but doesn't allow "
                        "a default or null value."
                        % (repr(current_object), self.model_attr)
                    )

            if callable(current_object):
                values.append(current_object())
            else:
                values.append(current_object)

        return values

    def split_model_attr_lookups(self):
        """Returns list of nested attributes for looking through the relation."""