How to signup in two different pages with devise - ruby-on-rails

Question

I used devise inthe login system.I want create two new html under the registrations, which is two different roles' pages. And I want to go to that page by choosing roles in registrations/new, which is the original signup file. What should I do next?
my files order in the view/user/registrations: enter image description here.
edit.html.erb
new.html.erb
new_librarian.html.erb
new_student.html.erb
I want to signup in the new two pages through registrations/new
<!-- what i changed in the registrations/new -->
<h2>Sign up</h2>
<p>Sign up as a Student<%= link_to 'Student', users_registrations_new_student_path, :method => 'get' %></p>
<p>Sign up as a Librarian<%= link_to 'Librarian', users_registrations_new_librarian_path, :method => 'get'%></p>
<!-- what is in the registrations/new_student -->
<h2>Sign up</h2>
<%= form_for(resource, as: resource_name, url: registration_path(resource_name)) do |f| %>
<%= render "devise/shared/error_messages", adminv: resource %>
<div class="field">
<%= f.label :email %><br />
<%= f.email_field :email, autofocus: true, autocomplete: "email" %>
</div>
<div class="field">
<%= f.label :password %>
<% if #minimum_password_length %>
<em>(<%= #minimum_password_length %> characters minimum)</em>
<% end %><br />
<%= f.password_field :password, autocomplete: "new-password" %>
</div>
<div class="field">
<%= f.label :password_confirmation %><br />
<%= f.password_field :password_confirmation, autocomplete: "new-password" %>
</div>
<div class="field">
<%= f.label :select_role %><br />
<%= f.collection_select :role, User::ROLES, :to_s, :humanize %>
</div>
<div class="actions">
<%= f.submit "Sign up" %>
</div>
<% end %>
<%= render "devise/shared/links" %>
<!-- what i changed in the routes.rb -->
get 'users/registrations/new_librarian'
get 'users/registrations/new_student'
Could not find devise mapping for path "/users/registrations/new_student". This may happen for two reasons:
1) You forgot to wrap your route inside the scope block. For example: devise_scope :user do get "/some/route" => "some_devise_controller" end
2) You are testing a Devise controller bypassing the router. If so, you can explicitly tell Devise which mapping to use: #request.env["devise.mapping"] = Devise.mappings[:user]

Answer 1

You can achieve this by overriding the devise registration controller. In your overrided registration controller, in the new method once the user is saved,
#app/config/routes.rb
devise_for :users, :controllers => {:registrations => "registrations"}
# app/controllers/registrations_controller.rb
class RegistrationsController < Devise::RegistrationsController
def new
if #user.save!
if #user.role == "librarian"
redirect_to librarian_profile_path
elsif #user.role == "student"
redirect_to student_profile_path
end
end
end
end
You can define librarian_profile_path and student_profile_path in your routes
#app/config/routes.rb
get 'librarian/new' => 'librarian_profile#new', :as => 'librarian_profile'
get 'student/new' => 'student_profile#new', :as => 'student_profile'