Use custom widget for template choices instead

A bit more Djangonic than tweaking self.fields

blanc_basic_pages/forms.py

@@ -15,10 +15,8 @@ class PageAdminForm(MPTTAdminForm):
     class Meta:
         model = Page
         exclude = ()
-
-    def __init__(self, *args, **kwargs):
-        super(PageAdminForm, self).__init__(*args, **kwargs)
-
-        # The list of templates is defined in settings, however as we can't have dynamic choices in
-        # models due to migrations - we change the form choices instead.
-        self.fields['template_name'] = forms.ChoiceField(choices=TEMPLATE_CHOICES, required=False)
+        widgets = {
+            # The list of templates is defined in settings, however as we can't have dynamic
+            # choices in models due to migrations - we change the form choices instead.
+            'template_name': forms.widgets.Select(choices=TEMPLATE_CHOICES),
+        }