Remove old methods and classes

app/assets/stylesheets/sections/notes.scss

@@ -262,7 +262,6 @@ ul.notes {
 }
 .new_note {
   display: none;
-
   .buttons {
     float: left;
     margin-top: 8px;

app/helpers/notes_helper.rb

 module NotesHelper
    # Helps to distinguish e.g. commit notes in mr notes list
   def note_for_main_target?(note)
-    (@target_type.camelize == note.noteable_type && !note.for_diff_line?)
+    (@noteable.class.name == note.noteable_type && !note.for_diff_line?)
   end
 
   def note_target_fields
@@ -21,14 +21,6 @@ module NotesHelper
     end
   end
 
-  def loading_more_notes?
-    params[:loading_more].present?
-  end
-
-  def loading_new_notes?
-    params[:loading_new].present?
-  end
-
   def note_timestamp(note)
     # Shows the created at time and the updated at time if different
     ts = "#{time_ago_with_tooltip(note.created_at, 'bottom', 'note_created_ago')} ago"
@@ -41,4 +33,13 @@ module NotesHelper
     end
     ts.html_safe
   end
+
+  def noteable_json(noteable)
+    {
+      id: noteable.id,
+      class: noteable.class.name,
+      resources: noteable.class.table_name,
+      project_id: noteable.project.id,
+    }.to_json
+  end
 end