Add very basic Vue.js grid/index experiment for Users table

tailbone/views/users.py

@@ -42,6 +42,7 @@ from tailbone import forms
 from tailbone.db import Session
 from tailbone.views import MasterView
 from tailbone.views.principal import PrincipalMasterView, PermissionsRenderer
+from tailbone.config import expose_vuejs_experiments
 
 
 class UsersView(PrincipalMasterView):
@@ -124,6 +125,16 @@ class UsersView(PrincipalMasterView):
         g.set_link('last_name')
         g.set_link('display_name')
 
+    def template_kwargs_index(self, **kwargs):
+        kwargs['expose_vuejs_experiments'] = expose_vuejs_experiments(self.rattail_config)
+        return kwargs
+
+    def vue_index(self):
+        if not expose_vuejs_experiments(self.rattail_config):
+            raise self.notfound()
+
+        return self.render_to_response('vue_index', {})
+
     def unique_username(self, node, value):
         query = self.Session.query(model.User)\
                             .filter(model.User.username == value)
@@ -308,6 +319,21 @@ class UsersView(PrincipalMasterView):
         assert not removing._roles
         self.Session.delete(removing)
 
+    @classmethod
+    def defaults(cls, config):
+        rattail_config = config.registry.settings.get('rattail_config')
+        route_prefix = cls.get_route_prefix()
+        url_prefix = cls.get_url_prefix()
+        permission_prefix = cls.get_permission_prefix()
+
+        # vue-index
+        config.add_route('{}.vue_index'.format(route_prefix), '{}/vue-index/'.format(url_prefix))
+        config.add_view(cls, attr='vue_index', route_name='{}.vue_index'.format(route_prefix),
+                        permission='{}.list'.format(permission_prefix))
+
+        cls._principal_defaults(config)
+        cls._defaults(config)
+
 
 class UserEventsView(MasterView):
     """