URLHelpers

When you use InheritedResources it creates some UrlHelpers for you. And they handle everything for you.

 # /posts/1/comments
 resource_url          # => /posts/1/comments/#{@comment.to_param}
 resource_url(comment) # => /posts/1/comments/#{comment.to_param}
 new_resource_url      # => /posts/1/comments/new
 edit_resource_url     # => /posts/1/comments/#{@comment.to_param}/edit
 collection_url        # => /posts/1/comments
 parent_url            # => /posts/1

 # /projects/1/tasks
 resource_url          # => /projects/1/tasks/#{@task.to_param}
 resource_url(task)    # => /projects/1/tasks/#{task.to_param}
 new_resource_url      # => /projects/1/tasks/new
 edit_resource_url     # => /projects/1/tasks/#{@task.to_param}/edit
 collection_url        # => /projects/1/tasks
 parent_url            # => /projects/1

 # /users
 resource_url          # => /users/#{@user.to_param}
 resource_url(user)    # => /users/#{user.to_param}
 new_resource_url      # => /users/new
 edit_resource_url     # => /users/#{@user.to_param}/edit
 collection_url        # => /users
 parent_url            # => /

The nice thing is that those urls are not guessed during runtime. They are all created when you inherit.