Use UserNoteEntity instead of UserEntity for notes

app/serializers/note_entity.rb

@@ -3,7 +3,7 @@ class NoteEntity < API::Entities::Note
 
   expose :type
 
-  expose :author, using: UserEntity
+  expose :author, using: UserNoteEntity
 
   expose :human_access do |note|
     note.project.team.human_max_access(note.author_id)
@@ -15,7 +15,7 @@ class NoteEntity < API::Entities::Note
   expose :redacted_note_html, as: :note_html
 
   expose :last_edited_at, if: -> (note, _) { note.is_edited? }
-  expose :last_edited_by, using: UserEntity, if: -> (note, _) { note.is_edited? }
+  expose :last_edited_by, using: UserNoteEntity, if: -> (note, _) { note.is_edited? }
 
   expose :current_user do
     expose :can_edit do |note|

app/serializers/user_entity.rb

 class UserEntity < API::Entities::UserBasic
   include RequestAwareEntity
 
-  unexpose :web_url
-
   expose :path do |user|
     user_path(user)
   end

app/serializers/user_note_entity.rb

+class UserNoteEntity < API::Entities::UserBasic
+  include RequestAwareEntity
+
+  unexpose :web_url
+
+  expose :path do |user|
+    user_path(user)
+  end
+end

spec/controllers/projects/issues_controller_spec.rb

@@ -877,4 +877,20 @@ describe Projects::IssuesController do
                                   format: :json
     end
   end
+
+  describe 'GET #discussions' do
+    let!(:discussion) { create(:discussion_note_on_issue, noteable: issue, project: issue.project) }
+
+    before do
+      project.add_developer(user)
+      sign_in(user)
+    end
+
+    it 'returns discussion json' do
+      get :discussions, namespace_id: project.namespace, project_id: project, id: issue.iid
+
+      expect(JSON.parse(response.body).first.keys).to match_array(
+        ['id', 'reply_id', 'expanded', 'notes', 'individual_note'])
+    end
+  end
 end

spec/serializers/note_entity_spec.rb

+require 'spec_helper'
+
+describe NoteEntity do
+  include Gitlab::Routing
+
+  let(:request) { double('request', current_user: user, noteable: note.noteable) }
+
+  let(:entity) { described_class.new(note, request: request) }
+  let(:note) { create(:note) }
+  let(:user) { create(:user) }
+  subject { entity.as_json }
+
+  context 'basic note' do
+    it 'exposes correct elements' do
+      expect(subject).to include(:type, :author, :human_access, :note, :note_html, :current_user,
+        :discussion_id, :emoji_awardable, :award_emoji, :toggle_award_path, :report_abuse_path, :path, :attachment)
+    end
+
+    it 'does not expose elements for specific notes cases' do
+      expect(subject).not_to include(:last_edited_by, :last_edited_at, :system_note_icon_name)
+    end
+
+    it 'exposes author correctly' do
+      expect(subject[:author]).to include(:id, :name, :username, :state, :avatar_url, :path)
+    end
+
+    it 'does not expose web_url for author' do
+      expect(subject[:author]).not_to include(:web_url)
+    end
+  end
+
+  context 'when note was edited' do
+    before do
+      note.update(updated_at: 1.minute.from_now, updated_by: user)
+    end
+
+    it 'exposes last_edited_at and last_edited_by elements' do
+      expect(subject).to include(:last_edited_at, :last_edited_by)
+    end
+  end
+
+  context 'when note is a system note' do
+    before do
+      note.update(system: true)
+    end
+
+    it 'exposes system_note_icon_name element' do
+      expect(subject).to include(:system_note_icon_name)
+    end
+  end
+end