How do I remove the Devise route to sign up?

you can do this in your model

# typical devise setup in User.rb
devise :database_authenticatable, :registerable, :recoverable, :rememberable, :trackable, :validatable

change it to:

devise :database_authenticatable, :recoverable, :rememberable, :trackable, :validatable

notice that the symbol :registerable was removed

That's it, nothing else is required. All routes and links to registration page are magically removed too.

I tried to do this as well, but a thread on the devise google group dissuaded me from searching for a really clean solution.

I'll quote José Valim (the Devise maintainer) :

There isn't a straight-forward option. You can either provide a patch or use :skip => :registerable and add only the routes you want.

The original question was :

Is there any good way to remove a specific route (the delete route) from Rails?