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queryset-refactor: Querysets no longer need to be customised per-back…


Instead, it's the Query class that is backend-dependent. So make that explicit
in the code (code should refer to sql.Query and they will always get the right
backend-specific class).

This also fixes the main part of #6956, in that the various subclasses of Query
automatically use any custom Query class.

Fixed #6956.

git-svn-id: bcc190cf-cafb-0310-a4f2-bffc1f526a37
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malcolmt committed Apr 16, 2008
1 parent c934bee commit 1add6fb36638f064f817d91ff5fb5222555b410c
Showing with 7 additions and 7 deletions.
  1. +1 −7 django/db/models/
  2. +6 −0 django/db/models/sql/
@@ -16,7 +16,7 @@
# Pull into this namespace for backwards compatibility
EmptyResultSet = sql.EmptyResultSet
-class _QuerySet(object):
+class QuerySet(object):
"Represents a lazy database lookup for a set of objects"
def __init__(self, model=None, query=None):
self.model = model
@@ -478,12 +478,6 @@ def _merge_sanity_check(self, other):
raise TypeError("Cannot merge querysets of different types ('%s' and '%s'."
% (self.__class__.__name__, other.__class__.__name__))
-# Use the backend's QuerySet class if it defines one. Otherwise, use _QuerySet.
-if connection.features.uses_custom_queryset:
- QuerySet = connection.ops.query_set_class(_QuerySet)
- QuerySet = _QuerySet
class ValuesQuerySet(QuerySet):
def __init__(self, *args, **kwargs):
super(ValuesQuerySet, self).__init__(*args, **kwargs)
@@ -13,6 +13,7 @@
from django.utils.tree import Node
from django.utils.datastructures import SortedDict
from django.dispatch import dispatcher
+from django.db import connection
from django.db.models import signals
from django.db.models.sql.where import WhereNode, EverythingNode, AND, OR
from django.db.models.sql.datastructures import Count
@@ -1371,6 +1372,11 @@ def execute_sql(self, result_type=MULTI):
return iter((lambda: cursor.fetchmany(GET_ITERATOR_CHUNK_SIZE)),
+# Use the backend's custom Query class if it defines one. Otherwise, use the
+# default.
+if connection.features.uses_custom_query_class:
+ Query = connection.ops.query_class(Query)
def get_order_dir(field, default='ASC'):
Returns the field name and direction for an order specification. For

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