Fixed #26118 -- Added 'is' operator to if template tag.

django/template/smartif.py

@@ -98,6 +98,7 @@ OPERATORS = {
     'not': prefix(8, lambda context, x: not x.eval(context)),
     'in': infix(9, lambda context, x, y: x.eval(context) in y.eval(context)),
     'not in': infix(9, lambda context, x, y: x.eval(context) not in y.eval(context)),
+    'is': infix(10, lambda context, x, y: x.eval(context) is y.eval(context)),
     '==': infix(10, lambda context, x, y: x.eval(context) == y.eval(context)),
     '!=': infix(10, lambda context, x, y: x.eval(context) != y.eval(context)),
     '>': infix(10, lambda context, x, y: x.eval(context) > y.eval(context)),

docs/ref/templates/builtins.txt

@@ -432,7 +432,7 @@ Use of actual parentheses in the :ttag:`if` tag is invalid syntax. If you need
 them to indicate precedence, you should use nested :ttag:`if` tags.
 
 :ttag:`if` tags may also use the operators ``==``, ``!=``, ``<``, ``>``,
-``<=``, ``>=`` and ``in`` which work as follows:
+``<=``, ``>=``, ``in``, and ``is`` which work as follows:
 
 ``==`` operator
 ^^^^^^^^^^^^^^^
@@ -524,6 +524,17 @@ you should use::
 
     {% if a > b and b > c %}
 
+``is`` operator
+^^^^^^^^^^^^^^^
+
+.. versionadded:: 1.10
+
+Object identity. Tests if two values are the same object. Example::
+
+    {% if value is None %}
+      This will output if and only if value is None.
+    {% endif %}
+
 Filters
 ~~~~~~~
 

docs/releases/1.10.txt

@@ -291,6 +291,8 @@ Templates
   :class:`~django.template.backends.django.DjangoTemplates` backend and the
   :class:`~django.template.Engine` class.
 
+* Added the ``is`` comparison operator to the :ttag:`if` tag.
+
 Tests
 ~~~~~
 

tests/template_tests/syntax_tests/test_if.py

@@ -527,3 +527,13 @@ class IfTagTests(SimpleTestCase):
         # A single equals sign is a syntax error.
         with self.assertRaises(TemplateSyntaxError):
             self.engine.render_to_string('if-tag-single-eq', {'foo': 1})
+
+    @setup({'template': '{% if foo is True %}yes{% else %}no{% endif %}'})
+    def test_if_is_match(self):
+        output = self.engine.render_to_string('template', {'foo': True})
+        self.assertEqual(output, 'yes')
+
+    @setup({'template': '{% if foo is True %}yes{% else %}no{% endif %}'})
+    def test_if_is_no_match(self):
+        output = self.engine.render_to_string('template', {'foo': 1})
+        self.assertEqual(output, 'no')