Adding routes
Create a resource for posting comments
when we create a resource for lets say courses we do this
resources :courses
What if we want to create a resource for comments on courses, that's actually pretty easy to do that.
you do that by adding a block, and passing in your comments resource,
and if you only want comments to be created . then you specify with only: [:create, :destroy] option ..
resources :courses do
resources :comments, :controller => "course_comments", only: [:create]
end