Method aggregate

django/db/models/query.py:615–638

Return a dictionary containing the calculations (aggregation) over the current queryset. If args is present the expression is passed as a kwarg using the Aggregate object's default alias.

(self, *args, **kwargs)

                yield item

    def aggregate(self, *args, **kwargs):
        """
        Return a dictionary containing the calculations (aggregation)
        over the current queryset.

        If args is present the expression is passed as a kwarg using
        the Aggregate object's default alias.
        """
        if self.query.distinct_fields:
            raise NotImplementedError("aggregate() + distinct(fields) not implemented.")
        self._validate_values_are_expressions(
            (*args, *kwargs.values()), method_name="aggregate"
        )
        for arg in args:
            # The default_alias property raises TypeError if default_alias
            # can't be set automatically or AttributeError if it isn't an
            # attribute.
            try:
                arg.default_alias
            except (AttributeError, TypeError):
                raise TypeError("Complex aggregates require an alias")
            kwargs[arg.default_alias] = arg

        return self.query.chain().get_aggregation(self.db, kwargs)

    async def aaggregate(self, *args, **kwargs):
        return await sync_to_async(self.aggregate)(*args, **kwargs)