Devise: redirect on sign up failure? - ruby-on-rails

Question

I'm trying to redirect users that have failed the sign up form (e.g. they entered a username that is already taken, they left a field blank, etc...)
I have custom failure set up for users that fail the sign in form, code below:
class CustomFailure < Devise::FailureApp
def redirect_url
root_path
end
def respond
if http_auth?
http_auth
else
redirect
end
end
However, I've been stuck on how to set this up for sign up failure. Ideally I would just like to redirect them back/to root_path, any ideas? Thank you!

Answer 1

You will probably need to subclass Devise::RegistrationsController and override the create action. Just copy over the create method from here and modify the redirect on failure to save.
# app/controllers/registrations_controller.rb
class RegistrationsController < Devise::RegistrationsController
def create
# modify logic to redirect to root url
end
end
Change your routes to tell Devise to use your controller:
# config/routes.rb
devise_for :users, :controllers => {:registrations => "registrations"}

Answer 2

It's a bit tedious to modify certain parts of devise to suit your needs and I suspect it's because the gem does a good job to cover most common cases. However, edge-cases for use of devise are a lot and your question points to one of them. I had to do something similar, that is, make sure devise redirects to a specific page when a user does one of the following:
submits form on an empty form
submits an already existing email.
Below is how I handled it.
First, create a controller called RegistrationsController that inherits from Devise::RegistrationsController like so:
class RegistrationsController < Devise::RegistrationsController
end
Inside this controller you will have override the create method in devise. Go to the devise github page here, https://github.com/plataformatec/devise/blob/master/app/controllers/devise/registrations_controller.rb to view the create method and copy the code in that method. Then create a private method to override the returning statment of the last block of the if statement. Your controller should look like so,
class RegistrationsController < Devise::RegistrationsController
def create
build_resource(sign_up_params)
resource.save
yield resource if block_given?
if resource.persisted?
if resource.active_for_authentication?
set_flash_message! :notice, :signed_up
sign_up(resource_name, resource)
respond_with resource, location: after_sign_up_path_for(resource)
else
set_flash_message! :notice, :"signed_up_but_#{resource.inactive_message}"
expire_data_after_sign_in!
respond_with resource, location: after_inactive_sign_up_path_for(resource)
end
else
clean_up_passwords resource
set_minimum_password_length
response_to_sign_up_failure resource
end
end
private
def response_to_sign_up_failure(resource)
if resource.email == "" && resource.password == nil
redirect_to root_path, alert: "Please fill in the form"
elsif User.pluck(:email).include? resource.email
redirect_to root_path, alert: "email already exists"
end
end
end
It should work.

Answer 3

Tip:
To keep flash error messages add this line before the redirect_to in your override
resource.errors.full_messages.each {|x| flash[x] = x}
So in your registrations_controller.rb :
def create
build_resource(sign_up_params)
if resource.save
yield resource if block_given?
if resource.active_for_authentication?
set_flash_message :notice, :signed_up if is_flashing_format?
sign_up(resource_name, resource)
respond_with resource, location: after_sign_up_path_for(resource)
else
set_flash_message :notice, :"signed_up_but_#{resource.inactive_message}" if is_flashing_format?
expire_data_after_sign_in!
respond_with resource, location: after_inactive_sign_up_path_for(resource)
end
else
clean_up_passwords resource
resource.errors.full_messages.each {|x| flash[x] = x} # Rails 4 simple way
redirect_to root_path
end
end

Answer 4

In config/routes.rb:
devise_scope :user do
get '/users', to: 'devise/registrations#new'
end