Znalazłem sposób i jestem z tego całkiem zadowolony. Opiszę to tutaj dla innych.

Poszedłem z jednej klasy "użytkownik". Moim problemem było osiągnięcie spersonalizowanego procesu rejestracji dla każdego pseudo modelu.

Model/użytkownik.rb:

class User < ActiveRecord::Base
  devise :confirmable,
       :database_authenticatable,
       :lockable,
       :recoverable,
       :registerable,
       :rememberable,
       :timeoutable,
       :trackable,
       :validatable

  # Setup accessible (or protected) attributes for your model
  attr_accessible :email, :password, :password_confirmation, :remember_me, :role

  as_enum :role, [:administrator, :client, :member]
  validates_as_enum :role
  ## Rails 4+ for the above two lines
  # enum role: [:administrator, :client, :member]

end

Potem zaadaptowałem http://railscasts.com/episodes/217-multistep-forms i http://pastie.org/1084054 aby mieć dwie ścieżki rejestracji z nadpisanym kontroler:

Config / routes.rb:

get  'users/sign_up'   => 'users/registrations#new',        :as => 'new_user_registration'

get  'clients/sign_up' => 'users/registrations#new_client', :as => 'new_client_registration'
post 'clients/sign_up' => 'users/registrations#create',     :as => 'client_registration'

get  'members/sign_up' => 'users/registrations#new_member', :as => 'new_member_registration'
post 'members/sign_up' => 'users/registrations#create',     :as => 'member_registration'

Controllers / users / registrations_controller.rb:

Stworzyłem klasę kreatora, która zna pola do walidacji na każdym kroku

class Users::RegistrationsController < Devise::RegistrationsController

    # GET /resource/sign_up
    def new
        session[:user] ||= { }
        @user = build_resource(session[:user])
        @wizard = ClientRegistrationWizard.new(current_step)

        respond_with @user
    end

    # GET /clients/sign_up
    def new_client
        session[:user] ||= { }
        session[:user]['role'] = :client
        @user = build_resource(session[:user])
        @wizard = ClientRegistrationWizard.new(current_step)

        render 'new_client'
    end

    # GET /members/sign_up
    def new_member
      # same
    end

    # POST /clients/sign_up
    # POST /members/sign_up
    def create
        session[:user].deep_merge!(params[:user]) if params[:user]
        @user = build_resource(session[:user])
        @wizard = ClientRegistrationWizard.new(current_step)

        if params[:previous_button]
            @wizard.previous
        elsif @user.valid?(@wizard)
            if @wizard.last_step?
                @user.save if @user.valid?
            else
                @wizard.next
            end
        end

        session[:registration_current_step] = @wizard.current_step

        if @user.new_record?
            clean_up_passwords @user
            render 'new_client'
        else
            #session[:registration_current_step] = nil
            session[:user_params] = nil

            if @user.active_for_authentication?
                set_flash_message :notice, :signed_up if is_navigational_format?
                sign_in(:user, @user)
                respond_with @user, :location => after_sign_up_path_for(@user)
            else
                set_flash_message :notice, :"signed_up_but_#{@user.inactive_message}" if is_navigational_format?
                expire_session_data_after_sign_in!
                respond_with @user, :location => after_inactive_sign_up_path_for(@user)
            end
        end

    end

    private

    def current_step
        if params[:wizard] && params[:wizard][:current_step]
            return params[:wizard][:current_step]
        end
        return session[:registration_current_step]
    end

end

A moje poglądy to:

• new.rb
• new_client.rb wraz z częściową zgodnie z krokiem kreatora:
  • _new_client_1.rb
  • _new_client_2.rb
• new_member.rb łącznie z częściowym według czarodzieja krok:
  • _new_member_1.rb
  • _new_member_2.rb