Add support for fields with subwidgets (BoundWidget)

README.rst

@@ -276,6 +276,23 @@ Output:
     </div>
 
 
+Fields with multiple widgets
+============================
+
+Some fields may render as a `MultiWidget`, composed of multiple subwidgets
+(for example, a `ChoiceField` using `RadioSelect`). You can use the same tags
+and filters, but your template code will need to include a for loop for fields
+like this:
+
+.. code-block:: html+django
+
+    {% load widget_tweaks %}
+
+    {% for widget in form.choice %}
+        {{ widget|add_class:"css_class_1 css_class_2" }}
+    {% endfor %}
+
+
 Mixing render_field and filters
 ===============================
 
@@ -356,7 +373,3 @@ Make sure you have `tox <http://tox.testrun.org/>`_ installed, then type
 
 from the source checkout.
 
-NOT SUPPORTED
-=============
-
-MultiWidgets: SplitDateTimeWidget, SplitHiddenDateTimeWidget

widget_tweaks/templatetags/widget_tweaks.py

@@ -24,7 +24,21 @@
     attribute = params[0].replace("::", ":")
     value = params[1] if len(params) == 2 else True
     field = copy(field)
-    # decorate field.as_widget method with updated attributes
+    # decorate field.as_widget or field.tag method with updated attributes
+
+    if not hasattr(field, 'as_widget'):
+        old_tag = field.tag
+
+        def tag(self, wrap_label=False):  # pylint: disable=unused-argument
+            attrs = self.data['attrs']
+            process(self.parent_widget, attrs, attribute, value)
+            html = old_tag(wrap_label=False)
+            self.tag = old_tag
+            return html
+
+        field.tag = types.MethodType(tag, field)
+        return field
+
     old_as_widget = field.as_widget
 
     def as_widget(self, widget=None, attrs=None, only_initial=False):