Add before_render_index() customization hook for MasterView

tailbone/views/master.py

@@ -335,8 +335,17 @@ class MasterView(View):
             context['download_results_rows_fields_available'] = available
             context['download_results_rows_fields_default'] = self.download_results_rows_fields_default(available)
 
+        self.before_render_index()
         return self.render_to_response('index', context)
 
+    def before_render_index(self):
+        """
+        Perform any needed logic just prior to rendering the index
+        response.  Note that this logic is invoked only when rendering
+        the main index page, but *not* invoked when refreshing partial
+        grid contents etc.
+        """
+
     def make_grid(self, factory=None, key=None, data=None, columns=None, **kwargs):
         """
         Creates a new grid instance