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from django.db.models import Manager
from django.db.models.query import QuerySet
from django.db.models.sql.query import Query
class GroupedQuery(Query):
def add_grouping(self, *grouping):
if self.group_by is None:
self.group_by = []
if isinstance(self.group_by, list):
self.group_by.extend(grouping)
def clear_grouping(self):
self.group_by = None
class GroupedQuerySet(QuerySet):
def __init__(self, model=None, query=None, using=None, hints=None):
super(GroupedQuerySet, self).__init__(model, query, using, hints)
self.query = query or GroupedQuery(self.model)
def group_by(self, *field_names):
obj = self._clone()
obj.query.clear_grouping()
obj.query.add_grouping(*field_names)
return obj
class GroupedManager(Manager):
def __init__(self):
super(GroupedManager, self).__init__()
self._queryset_class = GroupedQuerySet
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