Expire ETag cache on note when award emoji changes

app/models/award_emoji.rb

@@ -17,6 +17,9 @@ class AwardEmoji < ActiveRecord::Base
   scope :downvotes, -> { where(name: DOWNVOTE_NAME) }
   scope :upvotes,   -> { where(name: UPVOTE_NAME) }
+  after_save :expire_etag_cache
+  after_destroy :expire_etag_cache
+
   class << self
     def votes_for_collection(ids, type)
       select('name', 'awardable_id', 'COUNT(*) as count')
@@ -32,4 +35,10 @@ class AwardEmoji < ActiveRecord::Base
   def upvote?
     self.name == UPVOTE_NAME
   end
+
+  def expire_etag_cache
+    return unless awardable.is_a?(Note)
+
+    awardable.expire_etag_cache
+  end
 end

app/models/note.rb

@@ -299,6 +299,17 @@ class Note < ActiveRecord::Base
     end
   end
+  def expire_etag_cache
+    return unless for_issue?
+
+    key = Gitlab::Routing.url_helpers.project_noteable_notes_path(
+      noteable.project,
+      target_type: noteable_type.underscore,
+      target_id: noteable.id
+    )
+    Gitlab::EtagCaching::Store.new.touch(key)
+  end
+
   private
   def keep_around_commit
@@ -326,15 +337,4 @@ class Note < ActiveRecord::Base
   def set_discussion_id
     self.discussion_id ||= discussion_class.discussion_id(self)
   end
-
-  def expire_etag_cache
-    return unless for_issue?
-
-    key = Gitlab::Routing.url_helpers.project_noteable_notes_path(
-      noteable.project,
-      target_type: noteable_type.underscore,
-      target_id: noteable.id
-    )
-    Gitlab::EtagCaching::Store.new.touch(key)
-  end
 end

spec/models/award_emoji_spec.rb

@@ -41,4 +41,40 @@ describe AwardEmoji, models: true do
       end
     end
   end
+
+  describe 'expiring ETag cache' do
+    context 'on a note' do
+      let(:note) { create(:note_on_issue) }
+      let(:award_emoji) { build(:award_emoji, user: build(:user), awardable: note) }
+
+      it 'calls expire_etag_cache on the note when saved' do
+        expect(note).to receive(:expire_etag_cache)
+
+        award_emoji.save!
+      end
+
+      it 'calls expire_etag_cache on the note when destroyed' do
+        expect(note).to receive(:expire_etag_cache)
+
+        award_emoji.destroy!
+      end
+    end
+
+    context 'on another awardable' do
+      let(:issue) { create(:issue) }
+      let(:award_emoji) { build(:award_emoji, user: build(:user), awardable: issue) }
+
+      it 'does not call expire_etag_cache on the issue when saved' do
+        expect(issue).not_to receive(:expire_etag_cache)
+
+        award_emoji.save!
+      end
+
+      it 'does not call expire_etag_cache on the issue when destroyed' do
+        expect(issue).not_to receive(:expire_etag_cache)
+
+        award_emoji.destroy!
+      end
+    end
+  end
 end