[1.11.x] Refs #27919 -- Changed Widget.get_context() attrs kwarg to an arg.

Backport of 075e93c16a and
93d0770104 from master

django/contrib/admin/widgets.py

@@ -34,7 +34,7 @@ class FilteredSelectMultiple(forms.SelectMultiple):
         self.is_stacked = is_stacked
         super(FilteredSelectMultiple, self).__init__(attrs, choices)
 
-    def get_context(self, name, value, attrs=None):
+    def get_context(self, name, value, attrs):
         context = super(FilteredSelectMultiple, self).get_context(name, value, attrs)
         context['widget']['attrs']['class'] = 'selectfilter'
         if self.is_stacked:
@@ -132,7 +132,7 @@ class ForeignKeyRawIdWidget(forms.TextInput):
         self.db = using
         super(ForeignKeyRawIdWidget, self).__init__(attrs)
 
-    def get_context(self, name, value, attrs=None):
+    def get_context(self, name, value, attrs):
         context = super(ForeignKeyRawIdWidget, self).get_context(name, value, attrs)
         rel_to = self.rel.model
         if rel_to in self.admin_site._registry:
@@ -199,7 +199,7 @@ class ManyToManyRawIdWidget(ForeignKeyRawIdWidget):
     """
     template_name = 'admin/widgets/many_to_many_raw_id.html'
 
-    def get_context(self, name, value, attrs=None):
+    def get_context(self, name, value, attrs):
         context = super(ManyToManyRawIdWidget, self).get_context(name, value, attrs)
         if self.rel.model in self.admin_site._registry:
             # The related object is registered with the same AdminSite
@@ -268,7 +268,7 @@ class RelatedFieldWidgetWrapper(forms.Widget):
         return reverse("admin:%s_%s_%s" % (info + (action,)),
                        current_app=self.admin_site.name, args=args)
 
-    def get_context(self, name, value, attrs=None):
+    def get_context(self, name, value, attrs):
         from django.contrib.admin.views.main import IS_POPUP_VAR, TO_FIELD_VAR
         rel_opts = self.rel.model._meta
         info = (rel_opts.app_label, rel_opts.model_name)

django/contrib/gis/admin/widgets.py

@@ -15,7 +15,7 @@ class OpenLayersWidget(Textarea):
     """
     Renders an OpenLayers map using the WKT of the geometry.
     """
-    def get_context(self, name, value, attrs=None):
+    def get_context(self, name, value, attrs):
         # Update the template parameters with any attributes passed in.
         if attrs:
             self.params.update(attrs)

django/contrib/gis/forms/widgets.py

@@ -42,7 +42,7 @@ class BaseGeometryWidget(Widget):
             logger.error("Error creating geometry from value '%s' (%s)", value, err)
         return None
 
-    def get_context(self, name, value, attrs=None):
+    def get_context(self, name, value, attrs):
         # If a string reaches here (via a validation error on another
         # field) then just reconstruct the Geometry.
         if value and isinstance(value, six.string_types):

django/forms/widgets.py

@@ -201,7 +201,7 @@ class Widget(six.with_metaclass(RenameWidgetMethods)):
             return formats.localize_input(value)
         return force_text(value)
 
-    def get_context(self, name, value, attrs=None):
+    def get_context(self, name, value, attrs):
         context = {}
         context['widget'] = {
             'name': name,
@@ -271,7 +271,7 @@ class Input(Widget):
             self.input_type = attrs.pop('type', self.input_type)
         super(Input, self).__init__(attrs)
 
-    def get_context(self, name, value, attrs=None):
+    def get_context(self, name, value, attrs):
         context = super(Input, self).get_context(name, value, attrs)
         context['widget']['type'] = self.input_type
         return context
@@ -323,7 +323,7 @@ class MultipleHiddenInput(HiddenInput):
     """
     template_name = 'django/forms/widgets/multiple_hidden.html'
 
-    def get_context(self, name, value, attrs=None):
+    def get_context(self, name, value, attrs):
         context = super(MultipleHiddenInput, self).get_context(name, value, attrs)
         final_attrs = context['widget']['attrs']
         id_ = context['widget']['attrs'].get('id')
@@ -405,7 +405,7 @@ class ClearableFileInput(FileInput):
         if self.is_initial(value):
             return value
 
-    def get_context(self, name, value, attrs=None):
+    def get_context(self, name, value, attrs):
         context = super(ClearableFileInput, self).get_context(name, value, attrs)
         checkbox_name = self.clear_checkbox_name(name)
         checkbox_id = self.clear_checkbox_id(checkbox_name)
@@ -502,7 +502,7 @@ class CheckboxInput(Input):
             return
         return force_text(value)
 
-    def get_context(self, name, value, attrs=None):
+    def get_context(self, name, value, attrs):
         if self.check_test(value):
             if attrs is None:
                 attrs = {}
@@ -622,7 +622,7 @@ class ChoiceWidget(Widget):
             'template_name': self.option_template_name,
         }
 
-    def get_context(self, name, value, attrs=None):
+    def get_context(self, name, value, attrs):
         context = super(ChoiceWidget, self).get_context(name, value, attrs)
         context['widget']['optgroups'] = self.optgroups(name, context['widget']['value'], attrs)
         context['wrap_label'] = True
@@ -667,7 +667,7 @@ class Select(ChoiceWidget):
     checked_attribute = {'selected': True}
     option_inherits_attrs = False
 
-    def get_context(self, name, value, attrs=None):
+    def get_context(self, name, value, attrs):
         context = super(Select, self).get_context(name, value, attrs)
         if self.allow_multiple_selected:
             context['widget']['attrs']['multiple'] = 'multiple'
@@ -789,7 +789,7 @@ class MultiWidget(Widget):
     def is_hidden(self):
         return all(w.is_hidden for w in self.widgets)
 
-    def get_context(self, name, value, attrs=None):
+    def get_context(self, name, value, attrs):
         context = super(MultiWidget, self).get_context(name, value, attrs)
         if self.is_localized:
             for widget in self.widgets:
@@ -941,7 +941,7 @@ class SelectDateWidget(Widget):
             self.month_none_value = self.none_value
             self.day_none_value = self.none_value
 
-    def get_context(self, name, value, attrs=None):
+    def get_context(self, name, value, attrs):
         context = super(SelectDateWidget, self).get_context(name, value, attrs)
         date_context = {}
         year_choices = [(i, i) for i in self.years]

docs/ref/forms/widgets.txt

@@ -241,7 +241,7 @@ foundation for custom widgets.
             In older versions, this method is a private API named
             ``_format_value()``. The old name will work until Django 2.0.
 
-    .. method:: get_context(name, value, attrs=None)
+    .. method:: get_context(name, value, attrs)
 
         .. versionadded:: 1.11
 
@@ -386,7 +386,7 @@ foundation for custom widgets.
 
     It provides some custom context:
 
-    .. method:: get_context(name, value, attrs=None)
+    .. method:: get_context(name, value, attrs)
 
         In addition to the ``'widget'`` key described in
         :meth:`Widget.get_context`, ``MultiValueWidget`` adds a