Serialize last_fetched_at as a string with seconds

app/controllers/projects/notes_controller.rb

@@ -5,7 +5,7 @@ class Projects::NotesController < Projects::ApplicationController
   before_filter :authorize_admin_note!, only: [:update, :destroy]
 
   def index
-    current_fetched_at = Time.now
+    current_fetched_at = Time.now.to_i
     @notes = NotesFinder.new.execute(project, current_user, params)
 
     notes_json = { notes: [], last_fetched_at: current_fetched_at }

app/finders/notes_finder.rb

@@ -4,7 +4,7 @@ class NotesFinder
   def execute(project, current_user, params)
     target_type = params[:target_type]
     target_id   = params[:target_id]
-    last_fetched_at = params.fetch(:last_fetched_at)
+    last_fetched_at = Time.at(params.fetch(:last_fetched_at).to_i)
 
     notes = case target_type
     when "commit"

app/views/projects/notes/_notes_with_form.html.haml

@@ -7,4 +7,4 @@
   = render "projects/notes/form"
 
 :javascript
-  new Notes("#{project_notes_path(target_id: @noteable.id, target_type: @noteable.class.name.underscore)}", #{@notes.map(&:id).to_json}, Time.now)
+  new Notes("#{project_notes_path(target_id: @noteable.id, target_type: @noteable.class.name.underscore)}", #{@notes.map(&:id).to_json}, #{Time.now.to_i})

spec/finders/notes_finder_spec.rb

@@ -12,7 +12,7 @@ describe NotesFinder do
   end
 
   describe :execute do
-    let(:params)  { { target_id: commit.id, target_type: 'commit', last_fetched_at: 1.hour.ago } }
+    let(:params)  { { target_id: commit.id, target_type: 'commit', last_fetched_at: 1.hour.ago.to_i } }
 
     before do
       note1