Question

I want limit scope parameter in my routes.
For example, I have this routes,

namespace devices do
 scope :device_type do 
  ..// my routes
 end
end

in this i want limit scope parameter

:devise_type

Only two routes should be is existed

devices/android
devices/ios

How to do this?

Answer 1

Easy, use constraints:

namespace :devices do
  scope :device_type, constraints: { device_type: /(android|ios)/ } do
    # ...
  end
end

Notice, that you can’t and don’t need to use \A, ^, \Z, and $, the whole regexp must match.