Switch render() arguments to the new way

Previously template.render() takes Context or RequestContext object
but after Django 1.8 the method takes a dict and request as separate
arguments. The old way will be dropped in Django 1.10.
This commit update the usage based on the Django 1.8 release notes [1].

commit 95d78a140f addresses this
deprecations but it turns out all similar places are not switched.
I searched the code base more carefully and found more.
I hope this clean up all of them.

After this change, extra_context which was passed to (Request)Context
previously is no longer available in HttpResponse object.
Volume unit test is tightly coupled with the context information
and checks rendered actions using the context. Thus the corresponding
tests no longer work. Since we can use only HttpResponse.content
(which is a rendered HTML), the new tests just check various strings
like ID, link and label of a specific action.
This is tricky, but this is now the only thing we can do.

[1] https://docs.djangoproject.com/en/1.8/ref/templates/upgrading/#get-template-and-select-template

Change-Id: I350c22dc3d7db7b93ca4b823dac1e3d88beef1a7

horizon/browsers/base.py

@@ -144,5 +144,4 @@ class ResourceBrowser(html.HTMLElement):
     def render(self):
         browser_template = template.loader.get_template(self.template)
         extra_context = {self.context_var_name: self}
-        context = template.RequestContext(self.request, extra_context)
-        return browser_template.render(context)
+        return browser_template.render(extra_context, self.request)

horizon/browsers/breadcrumb.py

@@ -42,5 +42,4 @@ class Breadcrumb(html.HTMLElement):
         """Renders the table using the template from the table options."""
         breadcrumb_template = template.loader.get_template(self.template)
         extra_context = {"breadcrumb": self}
-        context = template.RequestContext(self.request, extra_context)
-        return breadcrumb_template.render(context)
+        return breadcrumb_template.render(extra_context, self.request)

horizon/forms/fields.py

@@ -26,7 +26,6 @@ from django.forms import fields
 from django.forms import forms
 from django.forms.utils import flatatt
 from django.forms import widgets
-from django.template import Context
 from django.template.loader import get_template
 from django.utils.encoding import force_text
 from django.utils.functional import Promise
@@ -291,14 +290,14 @@ class ThemableSelectWidget(SelectWidget):
         id = attrs.pop('id', 'id_%s' % name)
 
         template = get_template('horizon/common/fields/_themable_select.html')
-        context = Context({
+        context = {
             'name': name,
             'options': new_choices,
             'id': id,
             'value': value,
             'initial_value': initial_value,
             'select_attrs': attrs,
-        })
+        }
         return template.render(context)
 
 

horizon/tables/base.py

@@ -1387,8 +1387,7 @@ class DataTable(object):
         table_template = template.loader.get_template(self._meta.template)
         extra_context = {self._meta.context_var_name: self,
                          'hidden_title': self._meta.hidden_title}
-        context = template.RequestContext(self.request, extra_context)
-        return table_template.render(context)
+        return table_template.render(extra_context, self.request)
 
     def get_absolute_url(self):
         """Returns the canonical URL for this table.
@@ -1545,9 +1544,8 @@ class DataTable(object):
         if self._meta.table_actions_menu_label:
             extra_context['table_actions_menu_label'] = \
                 self._meta.table_actions_menu_label
-        context = template.RequestContext(self.request, extra_context)
         self.set_multiselect_column_visibility(len(bound_actions) > 0)
-        return table_actions_template.render(context)
+        return table_actions_template.render(extra_context, self.request)
 
     def render_row_actions(self, datum, row=False):
         """Renders the actions specified in ``Meta.row_actions``.
@@ -1565,8 +1563,7 @@ class DataTable(object):
         bound_actions = self.get_row_actions(datum)
         extra_context = {"row_actions": bound_actions,
                          "row_id": self.get_object_id(datum)}
-        context = template.RequestContext(self.request, extra_context)
-        return row_actions_template.render(context)
+        return row_actions_template.render(extra_context, self.request)
 
     @staticmethod
     def parse_action(action_string):

horizon/utils/csvbase.py

@@ -84,8 +84,7 @@ class BaseCsvResponse(CsvDataMixin, HttpResponse):
         if template:
             # Display some header info if provided as a template
             header_template = django_template.loader.get_template(template)
-            context = django_template.RequestContext(request, self.context)
-            self.header = header_template.render(context)
+            self.header = header_template.render(self.context, request)
 
         if self.header:
             self.out.write(self.encode(self.header))
@@ -117,8 +116,7 @@ class BaseCsvStreamingResponse(CsvDataMixin, StreamingHttpResponse):
         if template:
             # Display some header info if provided as a template
             header_template = django_template.loader.get_template(template)
-            context = django_template.RequestContext(request, self.context)
-            self.header = header_template.render(context)
+            self.header = header_template.render(self.context, request)
 
         self._closable_objects.append(self.out)
 

horizon/workflows/base.py

@@ -181,8 +181,7 @@ class Action(forms.Form):
         extra_context = extra_context or {}
         if self.help_text_template:
             tmpl = template.loader.get_template(self.help_text_template)
-            context = template.RequestContext(self.request, extra_context)
-            text += tmpl.render(context)
+            text += tmpl.render(extra_context, self.request)
         else:
             text += linebreaks(force_text(self.help_text))
         return safe(text)

openstack_dashboard/dashboards/project/volumes/tests.py

@@ -14,7 +14,6 @@
 
 import copy
 import six
-from six import moves
 
 import django
 from django.conf import settings
@@ -1248,23 +1247,6 @@ class VolumeViewTests(test.ResetImageAPIVersionMixin, test.TestCase):
                          server.id)
         self.assertEqual(res.status_code, 200)
 
-    def _get_volume_row_action_from_ajax(self, res, action_name, row_id):
-        def _matches_row_id(context_row):
-            return (len(context_row.dicts) > 1 and
-                    hasattr(context_row.dicts[1], 'get') and
-                    context_row.dicts[1].get('row_id', None) == row_id)
-
-        matching = list(moves.filter(lambda r: _matches_row_id(r),
-                                     res.context))
-        self.assertGreater(len(matching), 1,
-                           "Expected at least one row matching %s" % row_id)
-        row = matching[-1].dicts[1]
-        matching_actions = list(moves.filter(lambda a: a.name == action_name,
-                                             row['row_actions']))
-        self.assertEqual(1, len(matching_actions),
-                         "Expected one row action named '%s'" % action_name)
-        return matching_actions[0]
-
     @test.create_stubs({cinder: ('tenant_absolute_limits',
                                  'volume_get',)})
     def test_create_snapshot_button_attributes(self):
@@ -1282,15 +1264,16 @@ class VolumeViewTests(test.ResetImageAPIVersionMixin, test.TestCase):
         res = self.client.get(res_url, {},
                               HTTP_X_REQUESTED_WITH='XMLHttpRequest')
 
-        snapshot_action = self._get_volume_row_action_from_ajax(
-            res, 'snapshots', volume.id)
-        self.assertEqual('horizon:project:volumes:create_snapshot',
-                         snapshot_action.url)
-        self.assertEqual(set(['ajax-modal']), set(snapshot_action.classes))
-        self.assertEqual('Create Snapshot',
-                         six.text_type(snapshot_action.verbose_name))
-        self.assertEqual((('volume', 'volume:create_snapshot'),),
-                         snapshot_action.policy_rules)
+        action_name = ('%(table)s__row_%(id)s__action_%(action)s' %
+                       {'table': 'volumes', 'id': volume.id,
+                        'action': 'snapshots'})
+        content = res.content.decode('utf-8')
+        self.assertIn(action_name, content)
+        self.assertIn('Create Snapshot', content)
+        self.assertIn(reverse('horizon:project:volumes:create_snapshot',
+                              args=[volume.id]),
+                      content)
+        self.assertNotIn('disabled', content)
 
     @test.create_stubs({cinder: ('tenant_absolute_limits',
                                  'volume_get',)})
@@ -1309,9 +1292,16 @@ class VolumeViewTests(test.ResetImageAPIVersionMixin, test.TestCase):
         res = self.client.get(res_url, {},
                               HTTP_X_REQUESTED_WITH='XMLHttpRequest')
 
-        snapshot_action = self._get_volume_row_action_from_ajax(
-            res, 'snapshots', volume.id)
-        self.assertIn('disabled', snapshot_action.classes,
+        action_name = ('%(table)s__row_%(id)s__action_%(action)s' %
+                       {'table': 'volumes', 'id': volume.id,
+                        'action': 'snapshots'})
+        content = res.content.decode('utf-8')
+        self.assertIn(action_name, content)
+        self.assertIn('Create Snapshot (Quota exceeded)', content)
+        self.assertIn(reverse('horizon:project:volumes:create_snapshot',
+                              args=[volume.id]),
+                      content)
+        self.assertIn('disabled', content,
                       'The create snapshot button should be disabled')
 
     @test.create_stubs({cinder: ('tenant_absolute_limits',