FreindlyId gem is used to make friendly looking URLs i.e it lets us replace id’s in the URL with the string. It also prevents hacking of the web-page since the id gets hidden by the slug. Before friendly_id: After friendly_id : Here are the simple steps to follow: Step 1: Add gem “friendly_id” to the Gemfile and run “bundle install” on terminal. A] On an existing application : Step 2: Run “rails g migration AddSlugToJobs”. In this case, “slug” is the column name which is adding into existing “jobs” table. Slug : Slug is the part of the URL. It is the slug which makes the URL user friendly. Slug rules states that the string in the URL is separated by dash (-). Its rule also states that the letters in the URL are in lowercase. Step 3: Add the following code to the migration file : In my application,I have migration file “20180109135747_add_slug_to_jobs.rb” in “db/migrate/20180109135747_add_slug_to_jobs.rb”. In this step I am a...