Fixed #24168 -- Allowed selecting a template engine in a few APIs.

Specifically in rendering shortcuts, template responses, and class-based
views that return template responses.

Also added a test for render_to_response(status=...) which was missing
from fdbfc980.

Thanks Tim and Carl for the review.

docs/ref/class-based-views/flattened-index.txt

@@ -35,6 +35,7 @@ TemplateView
 * :attr:`~django.views.generic.base.TemplateResponseMixin.content_type`
 * :attr:`~django.views.generic.base.View.http_method_names`
 * :attr:`~django.views.generic.base.TemplateResponseMixin.response_class` [:meth:`~django.views.generic.base.TemplateResponseMixin.render_to_response`]
+* :attr:`~django.views.generic.base.TemplateResponseMixin.template_engine`
 * :attr:`~django.views.generic.base.TemplateResponseMixin.template_name` [:meth:`~django.views.generic.base.TemplateResponseMixin.get_template_names`]
 
 **Methods**
@@ -89,6 +90,7 @@ DetailView
 * :attr:`~django.views.generic.base.TemplateResponseMixin.response_class` [:meth:`~django.views.generic.base.TemplateResponseMixin.render_to_response`]
 * :attr:`~django.views.generic.detail.SingleObjectMixin.slug_field` [:meth:`~django.views.generic.detail.SingleObjectMixin.get_slug_field`]
 * :attr:`~django.views.generic.detail.SingleObjectMixin.slug_url_kwarg`
+* :attr:`~django.views.generic.base.TemplateResponseMixin.template_engine`
 * :attr:`~django.views.generic.base.TemplateResponseMixin.template_name` [:meth:`~django.views.generic.base.TemplateResponseMixin.get_template_names`]
 * :attr:`~django.views.generic.detail.SingleObjectTemplateResponseMixin.template_name_field`
 * :attr:`~django.views.generic.detail.SingleObjectTemplateResponseMixin.template_name_suffix`
@@ -124,6 +126,7 @@ ListView
 * :attr:`~django.views.generic.list.MultipleObjectMixin.paginator_class`
 * :attr:`~django.views.generic.list.MultipleObjectMixin.queryset` [:meth:`~django.views.generic.list.MultipleObjectMixin.get_queryset`]
 * :attr:`~django.views.generic.base.TemplateResponseMixin.response_class` [:meth:`~django.views.generic.base.TemplateResponseMixin.render_to_response`]
+* :attr:`~django.views.generic.base.TemplateResponseMixin.template_engine`
 * :attr:`~django.views.generic.base.TemplateResponseMixin.template_name` [:meth:`~django.views.generic.base.TemplateResponseMixin.get_template_names`]
 * :attr:`~django.views.generic.list.MultipleObjectTemplateResponseMixin.template_name_suffix`
 
@@ -155,6 +158,7 @@ FormView
 * :attr:`~django.views.generic.edit.FormMixin.prefix` [:meth:`~django.views.generic.edit.FormMixin.get_prefix`]
 * :attr:`~django.views.generic.base.TemplateResponseMixin.response_class` [:meth:`~django.views.generic.base.TemplateResponseMixin.render_to_response`]
 * :attr:`~django.views.generic.edit.FormMixin.success_url` [:meth:`~django.views.generic.edit.FormMixin.get_success_url`]
+* :attr:`~django.views.generic.base.TemplateResponseMixin.template_engine`
 * :attr:`~django.views.generic.base.TemplateResponseMixin.template_name` [:meth:`~django.views.generic.base.TemplateResponseMixin.get_template_names`]
 
 **Methods**
@@ -191,6 +195,7 @@ CreateView
 * :attr:`~django.views.generic.detail.SingleObjectMixin.slug_field` [:meth:`~django.views.generic.detail.SingleObjectMixin.get_slug_field`]
 * :attr:`~django.views.generic.detail.SingleObjectMixin.slug_url_kwarg`
 * :attr:`~django.views.generic.edit.FormMixin.success_url` [:meth:`~django.views.generic.edit.FormMixin.get_success_url`]
+* :attr:`~django.views.generic.base.TemplateResponseMixin.template_engine`
 * :attr:`~django.views.generic.base.TemplateResponseMixin.template_name` [:meth:`~django.views.generic.base.TemplateResponseMixin.get_template_names`]
 * :attr:`~django.views.generic.detail.SingleObjectTemplateResponseMixin.template_name_field`
 * :attr:`~django.views.generic.detail.SingleObjectTemplateResponseMixin.template_name_suffix`
@@ -232,6 +237,7 @@ UpdateView
 * :attr:`~django.views.generic.detail.SingleObjectMixin.slug_field` [:meth:`~django.views.generic.detail.SingleObjectMixin.get_slug_field`]
 * :attr:`~django.views.generic.detail.SingleObjectMixin.slug_url_kwarg`
 * :attr:`~django.views.generic.edit.FormMixin.success_url` [:meth:`~django.views.generic.edit.FormMixin.get_success_url`]
+* :attr:`~django.views.generic.base.TemplateResponseMixin.template_engine`
 * :attr:`~django.views.generic.base.TemplateResponseMixin.template_name` [:meth:`~django.views.generic.base.TemplateResponseMixin.get_template_names`]
 * :attr:`~django.views.generic.detail.SingleObjectTemplateResponseMixin.template_name_field`
 * :attr:`~django.views.generic.detail.SingleObjectTemplateResponseMixin.template_name_suffix`
@@ -269,6 +275,7 @@ DeleteView
 * :attr:`~django.views.generic.detail.SingleObjectMixin.slug_field` [:meth:`~django.views.generic.detail.SingleObjectMixin.get_slug_field`]
 * :attr:`~django.views.generic.detail.SingleObjectMixin.slug_url_kwarg`
 * :attr:`~django.views.generic.edit.DeletionMixin.success_url` [:meth:`~django.views.generic.edit.DeletionMixin.get_success_url`]
+* :attr:`~django.views.generic.base.TemplateResponseMixin.template_engine`
 * :attr:`~django.views.generic.base.TemplateResponseMixin.template_name` [:meth:`~django.views.generic.base.TemplateResponseMixin.get_template_names`]
 * :attr:`~django.views.generic.detail.SingleObjectTemplateResponseMixin.template_name_field`
 * :attr:`~django.views.generic.detail.SingleObjectTemplateResponseMixin.template_name_suffix`
@@ -308,6 +315,7 @@ ArchiveIndexView
 * :attr:`~django.views.generic.list.MultipleObjectMixin.paginator_class`
 * :attr:`~django.views.generic.list.MultipleObjectMixin.queryset` [:meth:`~django.views.generic.list.MultipleObjectMixin.get_queryset`]
 * :attr:`~django.views.generic.base.TemplateResponseMixin.response_class` [:meth:`~django.views.generic.base.TemplateResponseMixin.render_to_response`]
+* :attr:`~django.views.generic.base.TemplateResponseMixin.template_engine`
 * :attr:`~django.views.generic.base.TemplateResponseMixin.template_name` [:meth:`~django.views.generic.base.TemplateResponseMixin.get_template_names`]
 * :attr:`~django.views.generic.list.MultipleObjectTemplateResponseMixin.template_name_suffix`
 
@@ -346,6 +354,7 @@ YearArchiveView
 * :attr:`~django.views.generic.list.MultipleObjectMixin.paginator_class`
 * :attr:`~django.views.generic.list.MultipleObjectMixin.queryset` [:meth:`~django.views.generic.list.MultipleObjectMixin.get_queryset`]
 * :attr:`~django.views.generic.base.TemplateResponseMixin.response_class` [:meth:`~django.views.generic.base.TemplateResponseMixin.render_to_response`]
+* :attr:`~django.views.generic.base.TemplateResponseMixin.template_engine`
 * :attr:`~django.views.generic.base.TemplateResponseMixin.template_name` [:meth:`~django.views.generic.base.TemplateResponseMixin.get_template_names`]
 * :attr:`~django.views.generic.list.MultipleObjectTemplateResponseMixin.template_name_suffix`
 * :attr:`~django.views.generic.dates.YearMixin.year` [:meth:`~django.views.generic.dates.YearMixin.get_year`]
@@ -387,6 +396,7 @@ MonthArchiveView
 * :attr:`~django.views.generic.list.MultipleObjectMixin.paginator_class`
 * :attr:`~django.views.generic.list.MultipleObjectMixin.queryset` [:meth:`~django.views.generic.list.MultipleObjectMixin.get_queryset`]
 * :attr:`~django.views.generic.base.TemplateResponseMixin.response_class` [:meth:`~django.views.generic.base.TemplateResponseMixin.render_to_response`]
+* :attr:`~django.views.generic.base.TemplateResponseMixin.template_engine`
 * :attr:`~django.views.generic.base.TemplateResponseMixin.template_name` [:meth:`~django.views.generic.base.TemplateResponseMixin.get_template_names`]
 * :attr:`~django.views.generic.list.MultipleObjectTemplateResponseMixin.template_name_suffix`
 * :attr:`~django.views.generic.dates.YearMixin.year` [:meth:`~django.views.generic.dates.YearMixin.get_year`]
@@ -428,6 +438,7 @@ WeekArchiveView
 * :attr:`~django.views.generic.list.MultipleObjectMixin.paginator_class`
 * :attr:`~django.views.generic.list.MultipleObjectMixin.queryset` [:meth:`~django.views.generic.list.MultipleObjectMixin.get_queryset`]
 * :attr:`~django.views.generic.base.TemplateResponseMixin.response_class` [:meth:`~django.views.generic.base.TemplateResponseMixin.render_to_response`]
+* :attr:`~django.views.generic.base.TemplateResponseMixin.template_engine`
 * :attr:`~django.views.generic.base.TemplateResponseMixin.template_name` [:meth:`~django.views.generic.base.TemplateResponseMixin.get_template_names`]
 * :attr:`~django.views.generic.list.MultipleObjectTemplateResponseMixin.template_name_suffix`
 * :attr:`~django.views.generic.dates.WeekMixin.week` [:meth:`~django.views.generic.dates.WeekMixin.get_week`]
@@ -473,6 +484,7 @@ DayArchiveView
 * :attr:`~django.views.generic.list.MultipleObjectMixin.paginator_class`
 * :attr:`~django.views.generic.list.MultipleObjectMixin.queryset` [:meth:`~django.views.generic.list.MultipleObjectMixin.get_queryset`]
 * :attr:`~django.views.generic.base.TemplateResponseMixin.response_class` [:meth:`~django.views.generic.base.TemplateResponseMixin.render_to_response`]
+* :attr:`~django.views.generic.base.TemplateResponseMixin.template_engine`
 * :attr:`~django.views.generic.base.TemplateResponseMixin.template_name` [:meth:`~django.views.generic.base.TemplateResponseMixin.get_template_names`]
 * :attr:`~django.views.generic.list.MultipleObjectTemplateResponseMixin.template_name_suffix`
 * :attr:`~django.views.generic.dates.YearMixin.year` [:meth:`~django.views.generic.dates.YearMixin.get_year`]
@@ -520,6 +532,7 @@ TodayArchiveView
 * :attr:`~django.views.generic.list.MultipleObjectMixin.paginator_class`
 * :attr:`~django.views.generic.list.MultipleObjectMixin.queryset` [:meth:`~django.views.generic.list.MultipleObjectMixin.get_queryset`]
 * :attr:`~django.views.generic.base.TemplateResponseMixin.response_class` [:meth:`~django.views.generic.base.TemplateResponseMixin.render_to_response`]
+* :attr:`~django.views.generic.base.TemplateResponseMixin.template_engine`
 * :attr:`~django.views.generic.base.TemplateResponseMixin.template_name` [:meth:`~django.views.generic.base.TemplateResponseMixin.get_template_names`]
 * :attr:`~django.views.generic.list.MultipleObjectTemplateResponseMixin.template_name_suffix`
 * :attr:`~django.views.generic.dates.YearMixin.year` [:meth:`~django.views.generic.dates.YearMixin.get_year`]
@@ -565,6 +578,7 @@ DateDetailView
 * :attr:`~django.views.generic.base.TemplateResponseMixin.response_class` [:meth:`~django.views.generic.base.TemplateResponseMixin.render_to_response`]
 * :attr:`~django.views.generic.detail.SingleObjectMixin.slug_field` [:meth:`~django.views.generic.detail.SingleObjectMixin.get_slug_field`]
 * :attr:`~django.views.generic.detail.SingleObjectMixin.slug_url_kwarg`
+* :attr:`~django.views.generic.base.TemplateResponseMixin.template_engine`
 * :attr:`~django.views.generic.base.TemplateResponseMixin.template_name` [:meth:`~django.views.generic.base.TemplateResponseMixin.get_template_names`]
 * :attr:`~django.views.generic.detail.SingleObjectTemplateResponseMixin.template_name_field`
 * :attr:`~django.views.generic.detail.SingleObjectTemplateResponseMixin.template_name_suffix`

docs/ref/class-based-views/mixins-simple.txt

@@ -49,6 +49,15 @@ TemplateResponseMixin
         a ``template_name`` will raise a
         :class:`django.core.exceptions.ImproperlyConfigured` exception.
 
+    .. attribute:: template_engine
+
+        .. versionadded:: 1.8
+
+        The :setting:`NAME <TEMPLATES-NAME>` of a template engine to use for
+        loading the template. ``template_engine`` is passed as the ``using``
+        keyword argument to ``response_class``. Default is ``None``, which
+        tells Django to search for the template in all configured engines.
+
     .. attribute:: response_class
 
         The response class to be returned by ``render_to_response`` method.

docs/ref/template-response.txt

@@ -65,7 +65,7 @@ Attributes
 Methods
 -------
 
-.. method:: SimpleTemplateResponse.__init__(template, context=None, content_type=None, status=None, charset=None)
+.. method:: SimpleTemplateResponse.__init__(template, context=None, content_type=None, status=None, charset=None, using=None)
 
     Instantiates a :class:`~django.template.response.SimpleTemplateResponse`
     object with the given template, context, content type, HTTP status, and
@@ -102,9 +102,13 @@ Methods
         be extracted from ``content_type``, and if that is unsuccessful, the
         :setting:`DEFAULT_CHARSET` setting will be used.
 
-    .. versionadded:: 1.8
+    ``using``
+        The :setting:`NAME <TEMPLATES-NAME>` of a template engine to use for
+        loading the template.
 
-        The ``charset`` parameter was added.
+    .. versionchanged:: 1.8
+
+        The ``charset`` and ``using`` parameters were added.
 
 .. method:: SimpleTemplateResponse.resolve_context(context)
 
@@ -185,7 +189,7 @@ TemplateResponse objects
 Methods
 -------
 
-.. method:: TemplateResponse.__init__(request, template, context=None, content_type=None, status=None, current_app=None, charset=None)
+.. method:: TemplateResponse.__init__(request, template, context=None, content_type=None, status=None, current_app=None, charset=None, using=None)
 
     Instantiates a :class:`~django.template.response.TemplateResponse` object
     with the given request, template, context, content type, HTTP status, and
@@ -235,9 +239,13 @@ Methods
         be extracted from ``content_type``, and if that is unsuccessful, the
         :setting:`DEFAULT_CHARSET` setting will be used.
 
-    .. versionadded:: 1.8
+    ``using``
+        The :setting:`NAME <TEMPLATES-NAME>` of a template engine to use for
+        loading the template.
 
-        The ``charset`` parameter was added.
+    .. versionchanged:: 1.8
+
+        The ``charset`` and ``using`` parameters were added.
 
 The rendering process
 =====================

docs/topics/http/shortcuts.txt

@@ -15,7 +15,7 @@ introduce controlled coupling for convenience's sake.
 ``render``
 ==========
 
-.. function:: render(request, template_name[, context][, context_instance][, content_type][, status][, current_app][, dirs])
+.. function:: render(request, template_name[, context][, context_instance][, content_type][, status][, current_app][, dirs][, using])
 
    Combines a given template with a given context dictionary and returns an
    :class:`~django.http.HttpResponse` object with that rendered text.
@@ -77,6 +77,14 @@ Optional arguments
        The ``current_app`` argument is deprecated. Instead you should set
        ``request.current_app``.
 
+``using``
+    The :setting:`NAME <TEMPLATES-NAME>` of a template engine to use for
+    loading the template.
+
+.. versionchanged:: 1.8
+
+    The ``using`` parameter was added.
+
 .. deprecated:: 1.8
 
    The ``dirs`` parameter was deprecated.
@@ -109,7 +117,7 @@ This example is equivalent to::
 ``render_to_response``
 ======================
 
-.. function:: render_to_response(template_name[, context][, context_instance][, content_type][, status][, dirs])
+.. function:: render_to_response(template_name[, context][, context_instance][, content_type][, status][, dirs][, using])
 
    Renders a given template with a given context dictionary and returns an
    :class:`~django.http.HttpResponse` object with that rendered text.
@@ -159,9 +167,13 @@ Optional arguments
 ``status``
     The status code for the response. Defaults to ``200``.
 
+``using``
+    The :setting:`NAME <TEMPLATES-NAME>` of a template engine to use for
+    loading the template.
+
 .. versionchanged:: 1.8
 
-   The ``status`` parameter was added.
+   The ``status`` and ``using`` parameters were added.
 
 .. deprecated:: 1.8