add slack notifications

app/models/concerns/notifiable.rb

@@ -0,0 +1,18 @@
+
+
+# frozen_string_literal: true
+module Notifiable
+  extend ActiveSupport::Concern
+
+  included do
+    after_commit on: :create do
+      SlackNotifier.ping(notification_message)
+    end
+  end
+
+  private
+
+  def notification_message
+    raise NotImplementedError, "method should be implemented"
+  end
+end