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Fixed bug with using values() and extra(select) in the same QuerySet, with a select dictionary containing more than a few elements. This bug was identified in unit test from [5767]. The problem was that we were relying on the dictionary's .items() ordering, which is undefined 

git-svn-id: http://code.djangoproject.com/svn/django/trunk@5768 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Adrian Holovaty 2007-07-27 22:07:42 +00:00
parent 8831f3ee2c
commit 5b8d2c9f0d
1 changed files with 17 additions and 9 deletions
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24
django/db/models/query.py
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@ -579,28 +579,36 @@ class ValuesQuerySet(QuerySet):
except EmptyResultSet:
raise StopIteration
# self._fields is a list of field names to fetch.
# self._select is a dictionary, and dictionaries' key order is
# undefined, so we convert it to a list of tuples.
extra_select = self._select.items()
# Construct two objects -- fields and field_names.
# fields is a list of Field objects to fetch.
# field_names is a list of field names, which will be the keys in the
# resulting dictionaries.
if self._fields:
if not self._select:
if not extra_select:
fields = [self.model._meta.get_field(f, many_to_many=False) for f in self._fields]
field_names = self._fields
else:
fields = []
field_names = []
for f in self._fields:
if f in [field.name for field in self.model._meta.fields]:
fields.append(self.model._meta.get_field(f, many_to_many=False))
field_names.append(f)
elif not self._select.has_key(f):
raise FieldDoesNotExist, '%s has no field named %r' % ( self.model._meta.object_name, f )
field_names = self._fields
raise FieldDoesNotExist('%s has no field named %r' % (self.model._meta.object_name, f))
else: # Default to all fields.
fields = self.model._meta.fields
field_names = [f.attname for f in fields]
columns = [f.column for f in fields]
select = ['%s.%s' % (backend.quote_name(self.model._meta.db_table), backend.quote_name(c)) for c in columns]
# Add any additional SELECTs.
if self._select:
select.extend(['(%s) AS %s' % (quote_only_if_word(s[1]), backend.quote_name(s[0])) for s in self._select.items()])
if extra_select:
select.extend(['(%s) AS %s' % (quote_only_if_word(s[1]), backend.quote_name(s[0])) for s in extra_select])
field_names.extend([f[0] for f in extra_select])
cursor = connection.cursor()
cursor.execute("SELECT " + (self._distinct and "DISTINCT " or "") + ",".join(select) + sql, params)