Rails.application.routes.draw do

  get 'dev/log_in/:login(/:model)' => "dev_log_in#log_in"

end

Rails.application.routes.draw do

  get 'dev/log_in/:login(/:model)' => "dev_log_in#log_in", constraints: {login: /[^\/]+/}

end

Allow dots to be in login
Allow dots to be in login