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Code Issues 32 Releases Wiki Activity

Fixed #11402: added a QuerySet.exists() method. Thanks, Alex Gaynor.

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git-svn-id: http://code.djangoproject.com/svn/django/trunk@11646 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Jacob Kaplan-Moss
2009-10-24 00:28:39 +00:00
parent 9f70783b14
commit b79702b2de
6 changed files with 31 additions and 28 deletions
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8
django/forms/models.py
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@@ -319,9 +319,7 @@ class BaseModelForm(BaseForm):
if self.instance.pk is not None:
qs = qs.exclude(pk=self.instance.pk)
# This cute trick with extra/values is the most efficient way to
# tell if a particular query returns any results.
if qs.extra(select={'a': 1}).values('a').order_by():
if qs.exists():
if len(unique_check) == 1:
self._errors[unique_check[0]] = ErrorList([self.unique_error_message(unique_check)])
else:
@@ -354,9 +352,7 @@ class BaseModelForm(BaseForm):
if self.instance.pk is not None:
qs = qs.exclude(pk=self.instance.pk)
# This cute trick with extra/values is the most efficient way to
# tell if a particular query returns any results.
if qs.extra(select={'a': 1}).values('a').order_by():
if qs.exists():
self._errors[field] = ErrorList([
self.date_error_message(lookup_type, field, unique_for)
])