BaseContext

Controllers refactoring with contexts
Move commit compare logic to model

app/contexts/notes_load.rb

@@ -0,0 +1,30 @@
+class NotesLoad < BaseContext
+  def execute
+    target_type = params[:target_type]
+    target_id   = params[:target_id]
+    first_id    = params[:first_id]
+    last_id     = params[:last_id]
+
+
+    @notes = case target_type
+             when "commit" 
+               then project.commit_notes(project.commit(target_id)).fresh.limit(20)
+             when "snippet"
+               then  project.snippets.find(target_id).notes
+             when "wall"
+               then project.common_notes.order("created_at DESC").fresh.limit(50)
+             when "issue"
+               then project.issues.find(target_id).notes.inc_author.order("created_at DESC").limit(20)
+             when "merge_request"
+               then project.merge_requests.find(target_id).notes.inc_author.order("created_at DESC").limit(20)
+             end
+
+    @notes = if last_id
+               @notes.where("id > ?", last_id)
+             elsif first_id
+               @notes.where("id < ?", first_id)
+             else 
+               @notes
+             end
+  end
+end