newforms-admin: Merged from trunk up to [7941].

git-svn-id: http://code.djangoproject.com/svn/django/branches/newforms-admin@7944 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/query.py

@@ -280,11 +280,10 @@ class QuerySet(object):
         Performs a SELECT COUNT() and returns the number of records as an
         integer.
 
-        If the QuerySet is already cached (i.e. self._result_cache is set) this
+        If the QuerySet is already fully cached this simply returns the length
-        simply returns the length of the cached results set to avoid multiple
+        of the cached results set to avoid multiple SELECT COUNT(*) calls.
-        SELECT COUNT(*) calls.
         """
-        if self._result_cache is not None:
+        if self._result_cache is not None and not self._iter:
             return len(self._result_cache)
 
         return self.query.get_count()

django/test/utils.py

@@ -74,7 +74,10 @@ def teardown_test_environment():
 def _set_autocommit(connection):
     "Make sure a connection is in autocommit mode."
     if hasattr(connection.connection, "autocommit"):
+        if callable(connection.connection.autocommit):
             connection.connection.autocommit(True)
+        else:
+            connection.connection.autocommit = True
     elif hasattr(connection.connection, "set_isolation_level"):
         connection.connection.set_isolation_level(0)
 

tests/regressiontests/admin_scripts/tests.py

@@ -108,7 +108,7 @@ class AdminScriptTestCase(unittest.TestCase):
         self.assertEquals(len(stream), 0, "Stream should be empty: actually contains '%s'" % stream)
     def assertOutput(self, stream, msg):
         "Utility assertion: assert that the given message exists in the output"
-        self.assertTrue(msg in stream, "'%s' does not match actual output text '%s'" % (msg, stream))
+        self.failUnless(msg in stream, "'%s' does not match actual output text '%s'" % (msg, stream))
 
 ##########################################################################
 # DJANGO ADMIN TESTS

tests/regressiontests/queries/models.py

@@ -4,6 +4,7 @@ Various complex queries that have been problematic in the past.
 
 import datetime
 import pickle
+import sys
 
 from django.db import models
 from django.db.models.query import Q, ITER_CHUNK_SIZE
@@ -483,23 +484,6 @@ Bug #2076
 >>> Cover.objects.all()
 [<Cover: first>, <Cover: second>]
 
-# If you're not careful, it's possible to introduce infinite loops via default
-# ordering on foreign keys in a cycle. We detect that.
->>> LoopX.objects.all()
-Traceback (most recent call last):
-...
-FieldError: Infinite loop caused by ordering.
-
->>> LoopZ.objects.all()
-Traceback (most recent call last):
-...
-FieldError: Infinite loop caused by ordering.
-
-# ... but you can still order in a non-recursive fashion amongst linked fields
-# (the previous test failed because the default ordering was recursive).
->>> LoopX.objects.all().order_by('y__x__y__x__id')
-[]
-
 # If the remote model does not have a default ordering, we order by its 'id'
 # field.
 >>> Item.objects.order_by('creator', 'name')
@@ -830,5 +814,37 @@ another cursor.
 ...     obj.save()
 ...     if i > 10: break
 
+Bug #7759 -- count should work with a partially read result set.
+>>> count = Number.objects.count()
+>>> qs = Number.objects.all()
+>>> for obj in qs:
+...     qs.count() == count
+...     break
+True
+
 """}
 
+# In Python 2.3, exceptions raised in __len__ are swallowed (Python issue
+# 1242657), so these cases return an empty list, rather than raising an
+# exception. Not a lot we can do about that, unfortunately, due to the way
+# Python handles list() calls internally. Thus, we skip the tests for Python
+# 2.3.
+if sys.version_info >= (2, 4):
+    __test__["API_TESTS"] += """
+# If you're not careful, it's possible to introduce infinite loops via default
+# ordering on foreign keys in a cycle. We detect that.
+>>> LoopX.objects.all()
+Traceback (most recent call last):
+...
+FieldError: Infinite loop caused by ordering.
+
+>>> LoopZ.objects.all()
+Traceback (most recent call last):
+...
+FieldError: Infinite loop caused by ordering.
+
+# ... but you can still order in a non-recursive fashion amongst linked fields
+# (the previous test failed because the default ordering was recursive).
+>>> LoopX.objects.all().order_by('y__x__y__x__id')
+[]
+"""