add the required integer column and the increment statement when featured

db/migrate/20180202132034_add_times_featured_to_request_for_comments.rb

@@ -0,0 +1,5 @@
+class AddTimesFeaturedToRequestForComments < ActiveRecord::Migration
+  def change
+    add_column :request_for_comments, :times_featured, :integer, default: 0
+  end
+end