feat: improve page linkage between role/user/person

- show Users grid when viewing a Role
- add hyperlinks between things

tests/views/test_people.py

@@ -35,11 +35,26 @@ class TestPersonView(WebTestCase):
         model = self.app.model
         view = self.make_view()
         form = view.make_form(model_class=model.Person)
-        form.set_fields(form.get_model_fields())
-        self.assertEqual(form.required_fields, {})
-        view.configure_form(form)
-        self.assertTrue(form.required_fields)
-        self.assertFalse(form.required_fields['middle_name'])
+
+        # required fields
+        with patch.object(view, 'creating', new=True):
+            form.set_fields(form.get_model_fields())
+            self.assertEqual(form.required_fields, {})
+            view.configure_form(form)
+            self.assertTrue(form.required_fields)
+            self.assertFalse(form.required_fields['middle_name'])
+
+        person = model.Person(full_name="Barney Rubble")
+        user = model.User(username='barney', person=person)
+        self.session.add(user)
+        self.session.commit()
+
+        # users field
+        with patch.object(view, 'viewing', new=True):
+            form = view.make_form(model_instance=person)
+            self.assertEqual(form.defaults, {})
+            view.configure_form(form)
+            self.assertIn('_users', form.defaults)
 
     def test_autocomplete_query(self):
         model = self.app.model