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Code Issues 32 Releases Wiki Activity

queryset-refactor: Allow exclusions when bumping the aliases on a subquery.

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git-svn-id: http://code.djangoproject.com/svn/django/branches/queryset-refactor@7288 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Malcolm Tredinnick 2008-03-18 13:53:22 +00:00
parent bec21f0e2b
commit 150b7ac770
1 changed files with 6 additions and 1 deletions
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7
django/db/models/sql/query.py
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@ -652,7 +652,7 @@ class Query(object):
data[LHS_ALIAS] = change_map[lhs]
self.alias_map[alias] = tuple(data)
def bump_prefix(self):
def bump_prefix(self, exceptions=()):
"""
Changes the alias prefix to the next letter in the alphabet and
relabels all the aliases. Even tables that previously had no alias will
@ -661,12 +661,17 @@ class Query(object):
Subclasses who create their own prefix should override this method to
produce a similar result (a new prefix and relabelled aliases).
The 'exceptions' parameter is a container that holds alias names which
should not be changed.
"""
assert ord(self.alias_prefix) < ord('Z')
self.alias_prefix = chr(ord(self.alias_prefix) + 1)
change_map = {}
prefix = self.alias_prefix
for pos, alias in enumerate(self.tables):
if alias in exceptions:
continue
new_alias = '%s%d' % (prefix, pos)
change_map[alias] = new_alias
self.tables[pos] = new_alias