Ticket #19881: get_next_using_manager.patch

django/db/models/base.py

@@ -666 +666 @@
 
     delete.alters_data = True
 
+    def _get_manager_or_default(self, attr=None):
+        if attr and hasattr(self.__class__, attr):
+            manager = getattr(self.__class__, attr)
+        else:
+            manager = self.__class__._default_manager
+        return manager
+
     def _get_FIELD_display(self, field):
         value = getattr(self, field.attname)
         return force_text(dict(field.flatchoices).get(value, value), strings_only=True)
@@ -675 +682 @@
             raise ValueError("get_next/get_previous cannot be used on unsaved objects.")
         op = is_next and 'gt' or 'lt'
         order = not is_next and '-' or ''
+        using_manager = kwargs.pop('using_manager', None)
+        manager = self._get_manager_or_default(using_manager)
         param = force_text(getattr(self, field.attname))
         q = Q(**{'%s__%s' % (field.name, op): param})
         q = q | Q(**{field.name: param, 'pk__%s' % op: self.pk})
-        qs = self.__class__._default_manager.using(self._state.db).filter(**kwargs).filter(q).order_by('%s%s' % (order, field.name), '%spk' % order)
+        qs = manager.using(self._state.db).filter(**kwargs).filter(q).order_by('%s%s' % (order, field.name), '%spk' % order)
         try:
             return qs[0]
         except IndexError: