class Devise::Delegator

Checks the scope in the given environment and returns the associated failure app.

def call(env) 

def call(env)
  failure_app(env).call(env)
end

def failure_app(env) 

def failure_app(env)
  app = env["warden.options"] &&
    (scope = env["warden.options"][:scope]) &&
    Devise.mappings[scope.to_sym].failure_app
  app || Devise::FailureApp
end