[gsoc2009-testing] Merging to latest trunk

git-svn-id: http://code.djangoproject.com/svn/django/branches/soc2009/test-improvements@10965 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/admin/templates/admin/pagination.html

@@ -8,5 +8,5 @@
 {% endif %}
 {{ cl.result_count }} {% ifequal cl.result_count 1 %}{{ cl.opts.verbose_name }}{% else %}{{ cl.opts.verbose_name_plural }}{% endifequal %}
 {% if show_all_url %}&nbsp;&nbsp;<a href="{{ show_all_url }}" class="showall">{% trans 'Show all' %}</a>{% endif %}
-{% if cl.formset and cl.result_count %}<input type="submit" name="_save" class="default" value="Save"/>{% endif %}
+{% if cl.formset and cl.result_count %}<input type="submit" name="_save" class="default" value="{% trans 'Save' %}"/>{% endif %}
 </p>

django/contrib/gis/db/models/sql/where.py

@@ -35,7 +35,7 @@ class GeoWhereNode(WhereNode):
             return super(WhereNode, self).add(data, connector)
 
         obj, lookup_type, value = data
-        alias, col, field = obj.alias, obj.col, obj.field
+        col, field = obj.col, obj.field
 
         if not hasattr(field, "geom_type"):
             # Not a geographic field, so call `WhereNode.add`.
@@ -76,7 +76,7 @@ class GeoWhereNode(WhereNode):
             # the `get_geo_where_clause` to construct the appropriate
             # spatial SQL when `make_atom` is called.
             annotation = GeoAnnotation(field, value, where)
-            return super(WhereNode, self).add(((alias, col, field.db_type()), lookup_type, annotation, params), connector)
+            return super(WhereNode, self).add(((obj.alias, col, field.db_type()), lookup_type, annotation, params), connector)
 
     def make_atom(self, child, qn):
         obj, lookup_type, value_annot, params = child

django/contrib/gis/tests/relatedapp/models.py

@@ -32,3 +32,13 @@ class Parcel(models.Model):
     border2 = models.PolygonField(srid=2276)
     objects = models.GeoManager()
     def __unicode__(self): return self.name
+
+# These use the GeoManager but do not have any geographic fields.
+class Author(models.Model):
+    name = models.CharField(max_length=100)
+    objects = models.GeoManager()
+
+class Book(models.Model):
+    title = models.CharField(max_length=100)
+    author = models.ForeignKey(Author, related_name='books')
+    objects = models.GeoManager()

django/contrib/gis/tests/relatedapp/tests.py

@@ -1,10 +1,10 @@
 import os, unittest
 from django.contrib.gis.geos import *
 from django.contrib.gis.db.backend import SpatialBackend
-from django.contrib.gis.db.models import F, Extent, Union
+from django.contrib.gis.db.models import Count, Extent, F, Union
 from django.contrib.gis.tests.utils import no_mysql, no_oracle, no_spatialite
 from django.conf import settings
-from models import City, Location, DirectoryEntry, Parcel
+from models import City, Location, DirectoryEntry, Parcel, Book, Author
 
 cities = (('Aurora', 'TX', -97.516111, 33.058333),
           ('Roswell', 'NM', -104.528056, 33.387222),
@@ -196,8 +196,8 @@ class RelatedGeoModelTest(unittest.TestCase):
         # ID values do not match their City ID values.
         loc1 = Location.objects.create(point='POINT (-95.363151 29.763374)')
         loc2 = Location.objects.create(point='POINT (-96.801611 32.782057)')
-        dallas = City.objects.create(name='Dallas', location=loc2)
+        dallas = City.objects.create(name='Dallas', state='TX', location=loc2)
-        houston = City.objects.create(name='Houston', location=loc1)
+        houston = City.objects.create(name='Houston', state='TX', location=loc1)
 
         # The expected ID values -- notice the last two location IDs
         # are out of order.  We want to make sure that the related
@@ -231,6 +231,32 @@ class RelatedGeoModelTest(unittest.TestCase):
         q = pickle.loads(q_str)
         self.assertEqual(GeoQuery, q.__class__)
 
+    def test12_count(self):
+        "Testing `Count` aggregate use with the `GeoManager`. See #11087."
+        # Creating a new City, 'Fort Worth', that uses the same location
+        # as Dallas.
+        dallas = City.objects.get(name='Dallas')
+        ftworth = City.objects.create(name='Fort Worth', state='TX', location=dallas.location)
+        
+        # Count annotation should be 2 for the Dallas location now.
+        loc = Location.objects.annotate(num_cities=Count('city')).get(id=dallas.location.id)
+        self.assertEqual(2, loc.num_cities)
+
+        # Creating some data for the Book/Author non-geo models that
+        # use GeoManager.  See #11087.
+        tp = Author.objects.create(name='Trevor Paglen')
+        Book.objects.create(title='Torture Taxi', author=tp)
+        Book.objects.create(title='I Could Tell You But Then You Would Have to be Destroyed by Me', author=tp)
+        Book.objects.create(title='Blank Spots on the Map', author=tp)
+        wp = Author.objects.create(name='William Patry')
+        Book.objects.create(title='Patry on Copyright', author=wp)
+        
+        # Should only be one author (Trevor Paglen) returned by this query, and
+        # the annotation should have 3 for the number of books.
+        qs = Author.objects.annotate(num_books=Count('books')).filter(num_books__gt=1)
+        self.assertEqual(1, len(qs))
+        self.assertEqual(3, qs[0].num_books)
+
     # TODO: Related tests for KML, GML, and distance lookups.
 
 def suite():

django/db/models/base.py

@@ -411,29 +411,37 @@ class Model(object):
 
     save.alters_data = True
 
-    def save_base(self, raw=False, cls=None, force_insert=False,
+    def save_base(self, raw=False, cls=None, origin=None,
-            force_update=False):
+            force_insert=False, force_update=False):
         """
         Does the heavy-lifting involved in saving. Subclasses shouldn't need to
         override this method. It's separate from save() in order to hide the
         need for overrides of save() to pass around internal-only parameters
-        ('raw' and 'cls').
+        ('raw', 'cls', and 'origin').
         """
         assert not (force_insert and force_update)
-        if not cls:
+        if cls is None:
             cls = self.__class__
-            meta = self._meta
+            meta = cls._meta
-            signal = True
+            if not meta.proxy:
-            signals.pre_save.send(sender=self.__class__, instance=self, raw=raw)
+                origin = cls
         else:
             meta = cls._meta
-            signal = False
+
+        if origin:
+            signals.pre_save.send(sender=origin, instance=self, raw=raw)
 
         # If we are in a raw save, save the object exactly as presented.
         # That means that we don't try to be smart about saving attributes
         # that might have come from the parent class - we just save the
         # attributes we have been given to the class we have been given.
-        if not raw:
+        # We also go through this process to defer the save of proxy objects
+        # to their actual underlying model.
+        if not raw or meta.proxy:
+            if meta.proxy:
+                org = cls
+            else:
+                org = None
             for parent, field in meta.parents.items():
                 # At this point, parent's primary key field may be unknown
                 # (for example, from administration form which doesn't fill
@@ -441,7 +449,8 @@ class Model(object):
                 if field and getattr(self, parent._meta.pk.attname) is None and getattr(self, field.attname) is not None:
                     setattr(self, parent._meta.pk.attname, getattr(self, field.attname))
 
-                self.save_base(cls=parent)
+                self.save_base(cls=parent, origin=org)
+
                 if field:
                     setattr(self, field.attname, self._get_pk_val(parent._meta))
             if meta.proxy:
@@ -492,8 +501,8 @@ class Model(object):
                     setattr(self, meta.pk.attname, result)
             transaction.commit_unless_managed()
 
-        if signal:
+        if origin:
-            signals.post_save.send(sender=self.__class__, instance=self,
+            signals.post_save.send(sender=origin, instance=self,
                 created=(not record_exists), raw=raw)
 
     save_base.alters_data = True

django/db/models/fields/related.py

@@ -132,7 +132,8 @@ class RelatedField(object):
                     v, field = getattr(v, v._meta.pk.name), v._meta.pk
             except AttributeError:
                 pass
-            if field:
+            if not field:
+                field = self.rel.get_related_field()
             if lookup_type in ('range', 'in'):
                 v = [v]
             v = field.get_db_prep_lookup(lookup_type, v)
@@ -958,4 +959,3 @@ class ManyToManyField(RelatedField, Field):
         # A ManyToManyField is not represented by a single column,
         # so return None.
         return None
-

django/db/models/query.py

@@ -7,6 +7,8 @@ try:
 except NameError:
     from sets import Set as set     # Python 2.3 fallback
 
+from copy import deepcopy
+
 from django.db import connection, transaction, IntegrityError
 from django.db.models.aggregates import Aggregate
 from django.db.models.fields import DateField
@@ -40,6 +42,17 @@ class QuerySet(object):
     # PYTHON MAGIC METHODS #
     ########################
 
+    def __deepcopy__(self, memo):
+        """
+        Deep copy of a QuerySet doesn't populate the cache
+        """
+        obj_dict = deepcopy(self.__dict__, memo)
+        obj_dict['_iter'] = None
+
+        obj = self.__class__()
+        obj.__dict__.update(obj_dict)
+        return obj
+
     def __getstate__(self):
         """
         Allows the QuerySet to be pickled.
@@ -190,7 +203,25 @@ class QuerySet(object):
         index_start = len(extra_select)
         aggregate_start = index_start + len(self.model._meta.fields)
 
-        load_fields = only_load.get(self.model)
+        load_fields = []
+        # If only/defer clauses have been specified,
+        # build the list of fields that are to be loaded.
+        if only_load:
+            for field, model in self.model._meta.get_fields_with_model():
+                if model is None:
+                    model = self.model
+                if field == self.model._meta.pk:
+                    # Record the index of the primary key when it is found
+                    pk_idx = len(load_fields)
+                try:
+                    if field.name in only_load[model]:
+                        # Add a field that has been explicitly included
+                        load_fields.append(field.name)
+                except KeyError:
+                    # Model wasn't explicitly listed in the only_load table
+                    # Therefore, we need to load all fields from this model
+                    load_fields.append(field.name)
+
         skip = None
         if load_fields and not fill_cache:
             # Some fields have been deferred, so we have to initialise
@@ -355,10 +386,11 @@ class QuerySet(object):
 
         # Delete objects in chunks to prevent the list of related objects from
         # becoming too long.
+        seen_objs = None
         while 1:
             # Collect all the objects to be deleted in this chunk, and all the
             # objects that are related to the objects that are to be deleted.
-            seen_objs = CollectedObjects()
+            seen_objs = CollectedObjects(seen_objs)
             for object in del_query[:CHUNK_SIZE]:
                 object._collect_sub_objects(seen_objs)
 

django/db/models/query_utils.py

@@ -32,11 +32,21 @@ class CollectedObjects(object):
 
     This is used for the database object deletion routines so that we can
     calculate the 'leaf' objects which should be deleted first.
+
+    previously_seen is an optional argument. It must be a CollectedObjects
+    instance itself; any previously_seen collected object will be blocked from
+    being added to this instance.
     """
 
-    def __init__(self):
+    def __init__(self, previously_seen=None):
         self.data = {}
         self.children = {}
+        if previously_seen:
+            self.blocked = previously_seen.blocked
+            for cls, seen in previously_seen.data.items():
+                self.blocked.setdefault(cls, SortedDict()).update(seen)
+        else:
+            self.blocked = {}
 
     def add(self, model, pk, obj, parent_model, nullable=False):
         """
@@ -53,6 +63,9 @@ class CollectedObjects(object):
         Returns True if the item already existed in the structure and
         False otherwise.
         """
+        if pk in self.blocked.get(model, {}):
+            return True
+
         d = self.data.setdefault(model, SortedDict())
         retval = pk in d
         d[pk] = obj

django/db/models/sql/query.py

@@ -635,10 +635,10 @@ class BaseQuery(object):
             # models.
             workset = {}
             for model, values in seen.iteritems():
-                for field, f_model in model._meta.get_fields_with_model():
+                for field in model._meta.local_fields:
                     if field in values:
                         continue
-                    add_to_dict(workset, f_model or model, field)
+                    add_to_dict(workset, model, field)
             for model, values in must_include.iteritems():
                 # If we haven't included a model in workset, we don't add the
                 # corresponding must_include fields for that model, since an
@@ -657,6 +657,12 @@ class BaseQuery(object):
                     # included any fields, we have to make sure it's mentioned
                     # so that only the "must include" fields are pulled in.
                     seen[model] = values
+            # Now ensure that every model in the inheritance chain is mentioned
+            # in the parent list. Again, it must be mentioned to ensure that
+            # only "must include" fields are pulled in.
+            for model in orig_opts.get_parent_list():
+                if model not in seen:
+                    seen[model] = set()
             for model, values in seen.iteritems():
                 callback(target, model, values)
 
@@ -1619,10 +1625,14 @@ class BaseQuery(object):
                             entry.negate()
                             self.where.add(entry, AND)
                             break
-                elif not (lookup_type == 'in' and not value) and field.null:
+                elif not (lookup_type == 'in'
+                            and not hasattr(value, 'as_sql')
+                            and not hasattr(value, '_as_sql')
+                            and not value) and field.null:
                     # Leaky abstraction artifact: We have to specifically
                     # exclude the "foo__in=[]" case from this handling, because
                     # it's short-circuited in the Where class.
+                    # We also need to handle the case where a subquery is provided
                     entry = self.where_class()
                     entry.add((Constraint(alias, col, None), 'isnull', True), AND)
                     entry.negate()

django/test/test_coverage.py

@@ -62,9 +62,7 @@ class BaseCoverageRunner(object):
         packages, self.modules, self.excludes, self.errors = get_all_modules(
             coverage_modules, getattr(settings, 'COVERAGE_MODULE_EXCLUDES', []),
             getattr(settings, 'COVERAGE_PATH_EXCLUDES', []))
-        #for mods in self.modules.keys():
+
-        #    self.cov.analysis2(ModuleVars(mods, self.modules[mods]).source_file)
-            #coverage.analysis2(self.modules[mods])
         self.cov.report(self.modules.values(), show_missing=1)
 
         if self.excludes:
@@ -110,12 +108,10 @@ class ReportingCoverageRunner(BaseCoverageRunner):
         with the results
         """
         res = super(ReportingCoverageRunner, self).run_tests( *args, **kwargs)
-        #coverage._the_coverage.load()
+        self.cov.html_report(self.modules.values(),
-        #covss = coverage.html.HtmlReporter(self.cov)
+                                directory=self.outdir,
-        self.cov.html_report(self.modules.values(), directory=self.outdir, ignore_errors=True, omit_prefixes='modeltests')
+                                ignore_errors=True,
-        #cov.report(self.modules.values(), self.outdir)
+                                omit_prefixes='modeltests')
-        #coverage._the_coverage.html_report(self.modules.values(), self.outdir)
-
         print >>sys.stdout
         print >>sys.stdout, _("HTML reports were output to '%s'") %self.outdir
 

tests/modeltests/custom_pk/models.py

@@ -9,6 +9,8 @@ this behavior by explicitly adding ``primary_key=True`` to a field.
 from django.conf import settings
 from django.db import models, transaction, IntegrityError
 
+from fields import MyAutoField
+
 class Employee(models.Model):
     employee_code = models.IntegerField(primary_key=True, db_column = 'code')
     first_name = models.CharField(max_length=20)
@@ -28,6 +30,16 @@ class Business(models.Model):
     def __unicode__(self):
         return self.name
 
+class Bar(models.Model):
+    id = MyAutoField(primary_key=True, db_index=True)
+
+    def __unicode__(self):
+        return repr(self.pk)
+
+
+class Foo(models.Model):
+    bar = models.ForeignKey(Bar)
+
 __test__ = {'API_TESTS':"""
 >>> dan = Employee(employee_code=123, first_name='Dan', last_name='Jones')
 >>> dan.save()
@@ -121,6 +133,21 @@ DoesNotExist: Employee matching query does not exist.
 ...        print "Fail with %s" % type(e)
 Pass
 
+# Regression for #10785 -- Custom fields can be used for primary keys.
+>>> new_bar = Bar.objects.create()
+>>> new_foo = Foo.objects.create(bar=new_bar)
+>>> f = Foo.objects.get(bar=new_bar.pk)
+>>> f == new_foo
+True
+>>> f.bar == new_bar
+True
+
+>>> f = Foo.objects.get(bar=new_bar)
+>>> f == new_foo
+True
+>>> f.bar == new_bar
+True
+
 """}
 
 # SQLite lets objects be saved with an empty primary key, even though an

tests/modeltests/defer/models.py

@@ -17,6 +17,12 @@ class Primary(models.Model):
     def __unicode__(self):
         return self.name
 
+class Child(Primary):
+    pass
+
+class BigChild(Primary):
+    other = models.CharField(max_length=50)
+
 def count_delayed_fields(obj, debug=False):
     """
     Returns the number of delayed attributes on the given model instance.
@@ -33,7 +39,7 @@ def count_delayed_fields(obj, debug=False):
 
 __test__ = {"API_TEST": """
 To all outward appearances, instances with deferred fields look the same as
-normal instances when we examine attribut values. Therefore we test for the
+normal instances when we examine attribute values. Therefore we test for the
 number of deferred fields on returned instances (by poking at the internals),
 as a way to observe what is going on.
 
@@ -98,5 +104,89 @@ Using defer() and only() with get() is also valid.
 >>> Primary.objects.all()
 [<Primary: a new name>]
 
+# Regression for #10572 - A subclass with no extra fields can defer fields from the base class
+>>> _ = Child.objects.create(name="c1", value="foo", related=s1)
+
+# You can defer a field on a baseclass when the subclass has no fields
+>>> obj = Child.objects.defer("value").get(name="c1")
+>>> count_delayed_fields(obj)
+1
+>>> obj.name
+u"c1"
+>>> obj.value
+u"foo"
+>>> obj.name = "c2"
+>>> obj.save()
+
+# You can retrive a single column on a base class with no fields
+>>> obj = Child.objects.only("name").get(name="c2")
+>>> count_delayed_fields(obj)
+3
+>>> obj.name
+u"c2"
+>>> obj.value
+u"foo"
+>>> obj.name = "cc"
+>>> obj.save()
+
+>>> _ = BigChild.objects.create(name="b1", value="foo", related=s1, other="bar")
+
+# You can defer a field on a baseclass
+>>> obj = BigChild.objects.defer("value").get(name="b1")
+>>> count_delayed_fields(obj)
+1
+>>> obj.name
+u"b1"
+>>> obj.value
+u"foo"
+>>> obj.other
+u"bar"
+>>> obj.name = "b2"
+>>> obj.save()
+
+# You can defer a field on a subclass
+>>> obj = BigChild.objects.defer("other").get(name="b2")
+>>> count_delayed_fields(obj)
+1
+>>> obj.name
+u"b2"
+>>> obj.value
+u"foo"
+>>> obj.other
+u"bar"
+>>> obj.name = "b3"
+>>> obj.save()
+
+# You can retrieve a single field on a baseclass
+>>> obj = BigChild.objects.only("name").get(name="b3")
+>>> count_delayed_fields(obj)
+4
+>>> obj.name
+u"b3"
+>>> obj.value
+u"foo"
+>>> obj.other
+u"bar"
+>>> obj.name = "b4"
+>>> obj.save()
+
+# You can retrieve a single field on a baseclass
+>>> obj = BigChild.objects.only("other").get(name="b4")
+>>> count_delayed_fields(obj)
+4
+>>> obj.name
+u"b4"
+>>> obj.value
+u"foo"
+>>> obj.other
+u"bar"
+>>> obj.name = "bb"
+>>> obj.save()
+
+# Finally, we need to flush the app cache for the defer module.
+# Using only/defer creates some artifical entries in the app cache
+# that messes up later tests. Purge all entries, just to be sure.
+>>> from django.db.models.loading import cache
+>>> cache.app_models['defer'] = {}
 
 """}

tests/modeltests/proxy_models/models.py

@@ -259,6 +259,40 @@ FieldError: Proxy model 'NoNewFields' contains model fields.
 >>> OtherPerson._default_manager.all()
 [<OtherPerson: barney>, <OtherPerson: wilma>]
 
+# Test save signals for proxy models
+>>> from django.db.models import signals
+>>> def make_handler(model, event):
+...     def _handler(*args, **kwargs):
+...         print u"%s %s save" % (model, event)
+...     return _handler
+>>> h1 = make_handler('MyPerson', 'pre')
+>>> h2 = make_handler('MyPerson', 'post')
+>>> h3 = make_handler('Person', 'pre')
+>>> h4 = make_handler('Person', 'post')
+>>> signals.pre_save.connect(h1, sender=MyPerson)
+>>> signals.post_save.connect(h2, sender=MyPerson)
+>>> signals.pre_save.connect(h3, sender=Person)
+>>> signals.post_save.connect(h4, sender=Person)
+>>> dino = MyPerson.objects.create(name=u"dino")
+MyPerson pre save
+MyPerson post save
+
+# Test save signals for proxy proxy models
+>>> h5 = make_handler('MyPersonProxy', 'pre')
+>>> h6 = make_handler('MyPersonProxy', 'post')
+>>> signals.pre_save.connect(h5, sender=MyPersonProxy)
+>>> signals.post_save.connect(h6, sender=MyPersonProxy)
+>>> dino = MyPersonProxy.objects.create(name=u"pebbles")
+MyPersonProxy pre save
+MyPersonProxy post save
+
+>>> signals.pre_save.disconnect(h1, sender=MyPerson)
+>>> signals.post_save.disconnect(h2, sender=MyPerson)
+>>> signals.pre_save.disconnect(h3, sender=Person)
+>>> signals.post_save.disconnect(h4, sender=Person)
+>>> signals.pre_save.disconnect(h5, sender=MyPersonProxy)
+>>> signals.post_save.disconnect(h6, sender=MyPersonProxy)
+
 # A proxy has the same content type as the model it is proxying for (at the
 # storage level, it is meant to be essentially indistinguishable).
 >>> ctype = ContentType.objects.get_for_model
@@ -266,7 +300,7 @@ FieldError: Proxy model 'NoNewFields' contains model fields.
 True
 
 >>> MyPersonProxy.objects.all()
-[<MyPersonProxy: barney>, <MyPersonProxy: fred>]
+[<MyPersonProxy: barney>, <MyPersonProxy: dino>, <MyPersonProxy: fred>, <MyPersonProxy: pebbles>]
 
 >>> u = User.objects.create(name='Bruce')
 >>> User.objects.all()
@@ -327,4 +361,11 @@ True
 # Select related + filter on a related proxy of proxy field
 >>> ProxyImprovement.objects.select_related().get(associated_bug__summary__icontains='fix')
 <ProxyImprovement: ProxyImprovement:improve that>
+
+Proxy models can be loaded from fixtures (Regression for #11194)
+>>> from django.core import management
+>>> management.call_command('loaddata', 'mypeople.json', verbosity=0)
+>>> MyPerson.objects.get(pk=100)
+<MyPerson: Elvis Presley>
+
 """}

tests/regressiontests/defer_regress/models.py

@@ -84,7 +84,8 @@ Some further checks for select_related() and inherited model behaviour
 (regression for #10710).
 
 >>> c1 = Child.objects.create(name="c1", value=42)
->>> obj = Leaf.objects.create(name="l1", child=c1)
+>>> c2 = Child.objects.create(name="c2", value=37)
+>>> obj = Leaf.objects.create(name="l1", child=c1, second_child=c2)
 
 >>> obj = Leaf.objects.only("name", "child").select_related()[0]
 >>> obj.child.name
@@ -101,5 +102,24 @@ types as their non-deferred versions (bug #10738).
 >>> c1 is c2 is c3
 True
 
+# Regression for #10733 - only() can be used on a model with two foreign keys.
+>>> results = Leaf.objects.all().only('name', 'child', 'second_child').select_related()
+>>> results[0].child.name
+u'c1'
+>>> results[0].second_child.name
+u'c2'
+
+>>> results = Leaf.objects.all().only('name', 'child', 'second_child', 'child__name', 'second_child__name').select_related()
+>>> results[0].child.name
+u'c1'
+>>> results[0].second_child.name
+u'c2'
+
+# Finally, we need to flush the app cache for the defer module.
+# Using only/defer creates some artifical entries in the app cache
+# that messes up later tests. Purge all entries, just to be sure.
+>>> from django.db.models.loading import cache
+>>> cache.app_models['defer_regress'] = {}
+
 """
 }

tests/regressiontests/queries/models.py

@@ -1143,6 +1143,36 @@ True
 >>> r.save()
 >>> Ranking.objects.all()
 [<Ranking: 3: a1>, <Ranking: 2: a2>, <Ranking: 1: a3>]
+
+# Regression test for #10742:
+# Queries used in an __in clause don't execute subqueries
+
+>>> subq = Author.objects.filter(num__lt=3000)
+>>> qs = Author.objects.filter(pk__in=subq)
+>>> list(qs)
+[<Author: a1>, <Author: a2>]
+
+# The subquery result cache should not be populated
+>>> subq._result_cache is None
+True
+
+>>> subq = Author.objects.filter(num__lt=3000)
+>>> qs = Author.objects.exclude(pk__in=subq)
+>>> list(qs)
+[<Author: a3>, <Author: a4>]
+
+# The subquery result cache should not be populated
+>>> subq._result_cache is None
+True
+
+>>> subq = Author.objects.filter(num__lt=3000)
+>>> list(Author.objects.filter(Q(pk__in=subq) & Q(name='a1')))
+[<Author: a1>]
+
+# The subquery result cache should not be populated
+>>> subq._result_cache is None
+True
+
 """}
 
 # In Python 2.3 and the Python 2.6 beta releases, exceptions raised in __len__