Simplify Projects::NotificationSettingsController

app/controllers/projects/notification_settings_controller.rb

 class Projects::NotificationSettingsController < Projects::ApplicationController
   before_action :authenticate_user!
-  def create
-    notification_setting = current_user.notification_settings_for(project)
-    saved = notification_setting.update_attributes(notification_setting_params)
-
-    render json: { saved: saved }
-  end
-
   def update
     notification_setting = current_user.notification_settings_for(project)
     saved = notification_setting.update_attributes(notification_setting_params)

app/views/projects/buttons/_notifications.html.haml

 - if @notification_setting
-  = form_for @notification_setting, url: namespace_project_notification_setting_path(@project.namespace.becomes(Namespace), @project), remote: true, html: { class: 'inline', id: 'notification-form' } do |f|
+  = form_for @notification_setting, url: namespace_project_notification_setting_path(@project.namespace.becomes(Namespace), @project), method: :patch, remote: true, html: { class: 'inline', id: 'notification-form' } do |f|
     = f.hidden_field :level
     %span.dropdown
       %a.dropdown-new.btn.notifications-btn#notifications-button{href: '#', "data-toggle" => "dropdown"}

config/routes.rb

@@ -608,7 +608,7 @@ Rails.application.routes.draw do
         resources :forks, only: [:index, :new, :create]
         resource :import, only: [:new, :create, :show]
-        resource :notification_setting, only: [:create, :update]
+        resource :notification_setting, only: [:update]
         resources :refs, only: [] do
           collection do