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Code Issues 32 Releases Wiki Activity

magic-removal: Fixed #1136: Removed duplicated DB joins resulting from kwarg evaluation. Thanks, Russ Magee

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git-svn-id: http://code.djangoproject.com/svn/django/branches/magic-removal@1792 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Adrian Holovaty
2005-12-29 19:11:00 +00:00
parent dc5eb659fa
commit d382abc875
3 changed files with 105 additions and 59 deletions
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14
tests/modeltests/many_to_one/models.py
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@@ -67,6 +67,19 @@ This is a test
>>> Article.objects.get_list(reporter__first_name__exact='John', order_by=['pub_date'])
[This is a test, John's second story]
# Query twice over the related field.
>>> Article.objects.get_list(reporter__first_name__exact='John', reporter__last_name__exact='Smith')
[This is a test, John's second story]
# The underlying query only makes one join when a related table is referenced twice.
>>> null, sql, null = Article.objects._get_sql_clause(reporter__first_name__exact='John', reporter__last_name__exact='Smith')
>>> sql.count('INNER JOIN')
1
# The automatically joined table has a predictable name.
>>> Article.objects.get_list(reporter__first_name__exact='John', where=["many_to_one_articles__reporter.last_name='Smith'"])
[This is a test, John's second story]
# Find all Articles for the Reporter whose ID is 1.
>>> Article.objects.get_list(reporter__id__exact=1, order_by=['pub_date'])
[This is a test, John's second story]
@@ -95,4 +108,5 @@ John Smith
>>> a4.save()
>>> a4.get_reporter()
John Smith
"""