[1.2.X] Fixed #15157 -- Modified evaluation of literals surrounded by '_(' and ')' in templates to be done at render time instead of at compile time by using ugettext_lazy. Thanks Jonathan S for the report.

Backport of [15327] from trunk

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15328 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/template/__init__.py

@@ -59,7 +59,7 @@ from django.utils.itercompat import is_iterable
 from django.utils.functional import curry, Promise
 from django.utils.text import smart_split, unescape_string_literal, get_text_list
 from django.utils.encoding import smart_unicode, force_unicode, smart_str
-from django.utils.translation import ugettext as _
+from django.utils.translation import ugettext_lazy
 from django.utils.safestring import SafeData, EscapeData, mark_safe, mark_for_escaping
 from django.utils.formats import localize
 from django.utils.html import escape
@@ -698,7 +698,7 @@ class Variable(object):
             # We're dealing with a literal, so it's already been "resolved"
             value = self.literal
         if self.translate:
-            return _(value)
+            return ugettext_lazy(value)
         return value
 
     def __repr__(self):

tests/regressiontests/i18n/tests.py

@@ -11,7 +11,8 @@ from django.test import TestCase
 from django.utils.formats import get_format, date_format, time_format, localize, localize_input, iter_format_modules
 from django.utils.numberformat import format as nformat
 from django.utils.safestring import mark_safe, SafeString, SafeUnicode
-from django.utils.translation import ugettext, ugettext_lazy, activate, deactivate, gettext_lazy, to_locale
+from django.utils.translation import (ugettext, ugettext_lazy, activate,
+        deactivate, gettext_lazy, to_locale, get_language)
 from django.utils.importlib import import_module
 
 
@@ -678,3 +679,134 @@ class TestModels(TestCase):
         c.save()
         c.name = SafeString(u'Iñtërnâtiônàlizætiøn1'.encode('utf-8'))
         c.save()
+
+
+class MultipleLocaleActivationTests(TestCase):
+    """
+    Tests for template rendering behavior when multiple locales are activated
+    during the lifetime of the same process.
+    """
+    def setUp(self):
+        self._old_language = get_language()
+
+    def tearDown(self):
+        activate(self._old_language)
+
+    def test_single_locale_activation(self):
+        """
+        Simple baseline behavior with one locale for all the supported i18n constructs.
+        """
+        activate('fr')
+        self.assertEqual(Template("{{ _('Yes') }}").render(Context({})), 'Oui')
+        self.assertEqual(Template("{% load i18n %}{% trans 'Yes' %}").render(Context({})), 'Oui')
+        self.assertEqual(Template("{% load i18n %}{% blocktrans %}Yes{% endblocktrans %}").render(Context({})), 'Oui')
+
+    # Literal marked up with _() in a filter expression
+
+    def test_multiple_locale_filter(self):
+        activate('de')
+        t = Template("{% load i18n %}{{ 0|yesno:_('yes,no,maybe') }}")
+        activate(self._old_language)
+        activate('nl')
+        self.assertEqual(t.render(Context({})), 'nee')
+
+    def test_multiple_locale_filter_deactivate(self):
+        activate('de')
+        t = Template("{% load i18n %}{{ 0|yesno:_('yes,no,maybe') }}")
+        deactivate()
+        activate('nl')
+        self.assertEqual(t.render(Context({})), 'nee')
+
+    def test_multiple_locale_filter_direct_switch(self):
+        activate('de')
+        t = Template("{% load i18n %}{{ 0|yesno:_('yes,no,maybe') }}")
+        activate('nl')
+        self.assertEqual(t.render(Context({})), 'nee')
+
+    # Literal marked up with _()
+
+    def test_multiple_locale(self):
+        activate('de')
+        t = Template("{{ _('No') }}")
+        activate(self._old_language)
+        activate('nl')
+        self.assertEqual(t.render(Context({})), 'Nee')
+
+    def test_multiple_locale_deactivate(self):
+        activate('de')
+        t = Template("{{ _('No') }}")
+        deactivate()
+        activate('nl')
+        self.assertEqual(t.render(Context({})), 'Nee')
+
+    def test_multiple_locale_direct_switch(self):
+        activate('de')
+        t = Template("{{ _('No') }}")
+        activate('nl')
+        self.assertEqual(t.render(Context({})), 'Nee')
+
+    # Literal marked up with _(), loading the i18n template tag library
+
+    def test_multiple_locale_loadi18n(self):
+        activate('de')
+        t = Template("{% load i18n %}{{ _('No') }}")
+        activate(self._old_language)
+        activate('nl')
+        self.assertEqual(t.render(Context({})), 'Nee')
+
+    def test_multiple_locale_loadi18n_deactivate(self):
+        activate('de')
+        t = Template("{% load i18n %}{{ _('No') }}")
+        deactivate()
+        activate('nl')
+        self.assertEqual(t.render(Context({})), 'Nee')
+
+    def test_multiple_locale_loadi18n_direct_switch(self):
+        activate('de')
+        t = Template("{% load i18n %}{{ _('No') }}")
+        activate('nl')
+        self.assertEqual(t.render(Context({})), 'Nee')
+
+    # trans i18n tag
+
+    def test_multiple_locale_trans(self):
+        activate('de')
+        t = Template("{% load i18n %}{% trans 'No' %}")
+        activate(self._old_language)
+        activate('nl')
+        self.assertEqual(t.render(Context({})), 'Nee')
+
+    def test_multiple_locale_deactivate_trans(self):
+        activate('de')
+        t = Template("{% load i18n %}{% trans 'No' %}")
+        deactivate()
+        activate('nl')
+        self.assertEqual(t.render(Context({})), 'Nee')
+
+    def test_multiple_locale_direct_switch_trans(self):
+        activate('de')
+        t = Template("{% load i18n %}{% trans 'No' %}")
+        activate('nl')
+        self.assertEqual(t.render(Context({})), 'Nee')
+
+    # blocktrans i18n tag
+
+    def test_multiple_locale_btrans(self):
+        activate('de')
+        t = Template("{% load i18n %}{% blocktrans %}No{% endblocktrans %}")
+        activate(self._old_language)
+        activate('nl')
+        self.assertEqual(t.render(Context({})), 'Nee')
+
+    def test_multiple_locale_deactivate_btrans(self):
+        activate('de')
+        t = Template("{% load i18n %}{% blocktrans %}No{% endblocktrans %}")
+        deactivate()
+        activate('nl')
+        self.assertEqual(t.render(Context({})), 'Nee')
+
+    def test_multiple_locale_direct_switch_btrans(self):
+        activate('de')
+        t = Template("{% load i18n %}{% blocktrans %}No{% endblocktrans %}")
+        activate('nl')
+        self.assertEqual(t.render(Context({})), 'Nee')