[1.2.X] Fixed #15368 - test failures due to regression with RequestContext

Thanks to cyberdelia for the reports on this.

Backport of [15660] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15661 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/template/context.py

@@ -14,14 +14,21 @@ class ContextPopException(Exception):
     "pop() has been called more times than push()"
     pass
 
+class EmptyClass(object):
+    # No-op class which takes no args to its __init__ method, to help implement
+    # __copy__
+    pass
+
 class BaseContext(object):
     def __init__(self, dict_=None):
         dict_ = dict_ or {}
         self.dicts = [dict_]
 
     def __copy__(self):
-        duplicate = self._new()
-        duplicate.dicts = [dict_ for dict_ in self.dicts]
+        duplicate = EmptyClass()
+        duplicate.__class__ = self.__class__
+        duplicate.__dict__ = self.__dict__.copy()
+        duplicate.dicts = duplicate.dicts[:]
         return duplicate
 
     def __repr__(self):
@@ -31,9 +38,6 @@ class BaseContext(object):
         for d in reversed(self.dicts):
             yield d
 
-    def _new(self):
-        return self.__class__()
-
     def push(self):
         d = {}
         self.dicts.append(d)
@@ -87,10 +91,6 @@ class Context(BaseContext):
         duplicate.render_context = copy(self.render_context)
         return duplicate
 
-    def _new(self):
-        return self.__class__(autoescape=self.autoescape,
-                              current_app=self.current_app)
-
     def update(self, other_dict):
         "Like dict.update(). Pushes an entire dictionary's keys and values onto the context."
         if not hasattr(other_dict, '__getitem__'):
@@ -166,7 +166,3 @@ class RequestContext(Context):
             processors = tuple(processors)
         for processor in get_standard_processors() + processors:
             self.update(processor(request))
-
-    def _new(self):
-        return self.__class__(request=HttpRequest(),
-                              current_app=self.current_app)

tests/regressiontests/test_client_regress/models.py

@@ -9,6 +9,7 @@ from django.core.exceptions import SuspiciousOperation
 from django.core.urlresolvers import reverse
 from django.template import (TemplateDoesNotExist, TemplateSyntaxError,
     Context, loader)
+import django.template.context
 from django.test import TestCase, Client
 from django.test.client import encode_file
 from django.test.utils import ContextList
@@ -648,6 +649,17 @@ class ContextTests(TestCase):
         except KeyError, e:
             self.assertEquals(e.args[0], 'does-not-exist')
 
+    def test_15368(self):
+        # Need to insert a context processor that assumes certain things about
+        # the request instance. This triggers a bug caused by some ways of
+        # copying RequestContext.
+        try:
+            django.template.context._standard_context_processors = (lambda request: {'path': request.special_path},)
+            response = self.client.get("/test_client_regress/request_context_view/")
+            self.assertContains(response, 'Path: /test_client_regress/request_context_view/')
+        finally:
+            django.template.context._standard_context_processors = None
+
 
 class SessionTests(TestCase):
     fixtures = ['testdata.json']

tests/regressiontests/test_client_regress/templates/request_context.html

@@ -0,0 +1 @@
+Path: {{ path }}

tests/regressiontests/test_client_regress/urls.py

@@ -26,4 +26,5 @@ urlpatterns = patterns('',
     (r'^parse_unicode_json/$', views.return_json_file),
     (r'^check_headers/$', views.check_headers),
     (r'^check_headers_redirect/$', redirect_to, {'url': '/test_client_regress/check_headers/'}),
+    (r'^request_context_view/$', views.request_context_view),
 )

tests/regressiontests/test_client_regress/views.py

@@ -7,6 +7,7 @@ from django.utils import simplejson
 from django.utils.encoding import smart_str
 from django.core.serializers.json import DjangoJSONEncoder
 from django.test.client import CONTENT_TYPE_RE
+from django.template import RequestContext
 
 def no_template_view(request):
     "A simple view that expects a GET request, and returns a rendered template"
@@ -91,3 +92,7 @@ def check_headers(request):
     "A view that responds with value of the X-ARG-CHECK header"
     return HttpResponse('HTTP_X_ARG_CHECK: %s' % request.META.get('HTTP_X_ARG_CHECK', 'Undefined'))
 
+def request_context_view(request):
+    # Special attribute that won't be present on a plain HttpRequest
+    request.special_path = request.path
+    return render_to_response('request_context.html', context_instance=RequestContext(request, {}))