feat(nimbus): Add changelogs in assign tags

experimenter/experimenter/nimbus_ui/forms.py

@@ -1668,7 +1668,7 @@ def create_tag(self):
 )
 
 
-class TagAssignForm(forms.ModelForm):
+class TagAssignForm(NimbusChangeLogFormMixin, forms.ModelForm):
     class Meta:
         model = NimbusExperiment
         fields = ["tags"]
@@ -1678,6 +1678,9 @@ def __init__(self, *args, **kwargs):
         self.fields["tags"].queryset = Tag.objects.all().order_by("name")
         self.fields["tags"].widget = forms.CheckboxSelectMultiple()
 
+    def get_changelog_message(self):
+        return f"{self.request.user} updated tags"
+
 
 class CollaboratorsForm(NimbusChangeLogFormMixin, forms.ModelForm):
     collaborators = forms.ModelMultipleChoiceField(

experimenter/experimenter/nimbus_ui/tests/test_forms.py

@@ -4170,37 +4170,50 @@ def test_valid_form_assigns_tags(self):
         tag1 = TagFactory.create(name="Tag 1")
         tag2 = TagFactory.create(name="Tag 2")
 
-        form = TagAssignForm(instance=experiment, data={"tags": [tag1.id, tag2.id]})
+        form = TagAssignForm(
+            instance=experiment, data={"tags": [tag1.id, tag2.id]}, request=self.request
+        )
 
         self.assertTrue(form.is_valid())
         experiment = form.save()
 
         self.assertEqual(set(experiment.tags.all()), {tag1, tag2})
+        changelog = experiment.changes.latest("changed_on")
+        self.assertEqual(changelog.changed_by, self.user)
+        self.assertIn("updated tags", changelog.message)
 
     def test_form_removes_tags(self):
         tag1 = TagFactory.create(name="Tag 1")
         tag2 = TagFactory.create(name="Tag 2")
         experiment = NimbusExperimentFactory.create()
         experiment.tags.set([tag1, tag2])
 
-        form = TagAssignForm(instance=experiment, data={"tags": [tag1.id]})
+        form = TagAssignForm(
+            instance=experiment, data={"tags": [tag1.id]}, request=self.request
+        )
 
         self.assertTrue(form.is_valid())
         experiment = form.save()
 
         self.assertEqual(list(experiment.tags.all()), [tag1])
+        changelog = experiment.changes.latest("changed_on")
+        self.assertEqual(changelog.changed_by, self.user)
+        self.assertIn("updated tags", changelog.message)
 
     def test_form_with_no_tags(self):
         tag1 = TagFactory.create(name="Tag 1")
         experiment = NimbusExperimentFactory.create()
         experiment.tags.set([tag1])
 
-        form = TagAssignForm(instance=experiment, data={"tags": []})
+        form = TagAssignForm(instance=experiment, data={"tags": []}, request=self.request)
 
         self.assertTrue(form.is_valid())
         experiment = form.save()
 
         self.assertEqual(experiment.tags.count(), 0)
+        changelog = experiment.changes.latest("changed_on")
+        self.assertEqual(changelog.changed_by, self.user)
+        self.assertIn("updated tags", changelog.message)
 
     def test_form_queryset_ordered_by_name(self):
         TagFactory.create(name="Z Tag")

experimenter/experimenter/nimbus_ui/views.py

@@ -1033,6 +1033,8 @@ def post(self, request, *args, **kwargs):
         return render(request, self.template_name, {"formset": formset})
 
 
-class TagAssignView(NimbusExperimentViewMixin, RenderResponseMixin, UpdateView):
+class TagAssignView(
+    NimbusExperimentViewMixin, RequestFormMixin, RenderResponseMixin, UpdateView
+):
     form_class = TagAssignForm
     template_name = "nimbus_experiments/assign_tags_response.html"