LocomotiveCMS + Devise を使って作ったログインページのデザインをCMS側でできるようにする(2) ref: http://qiita.com/hal_sk/items/c0f56736398f1154ddca

confirmations_controller.rb

class Users::ConfirmationsController < Devise::ConfirmationsController
  protected
  # The path used after confirmation.
  def after_confirmation_path_for(resource_name, resource)
    if signed_in?
      '/registrationfinished'
    else
      new_session_path(resource_name)
    end
  end
end

registration_controller.rb

  def create
    build_resource(params.fetch(resource_name, {})) #パラメータから resource クラスを作成（Userクラスが入っている）

    resource_saved = resource.save #保存
    yield resource if block_given?
    if resource_saved   #ユーザ登録成功
      if resource.active_for_authentication?
        # メールによる確認なし
        sign_up(resource_name, resource)
        respond_with resource, location: after_sign_up_path_for(resource)
      else
        # メールによる確認あり
        @page = self.locomotive_page('/registrationconfirm')
        expire_data_after_sign_in!
        respond_to do |format|
          format.html {
             render :inline => @page.render(self.locomotive_context({}))
          }
        end
      end
    else
      # バリデーションエラー（再度入力フォームを呼び出す）
      @page ||= self.locomotive_page('/userregistration') 
      clean_up_passwords resource
      respond_to do |format|
        format.html {
           render :inline => @page.render(self.locomotive_context({ 'user' => resource, 'error' => devise_error_messages! }))
        }
      end
    end
  end
  # エラーメッセージを作って返す
  def devise_error_messages!
    return "" if resource.errors.empty?

    messages = resource.errors.full_messages.map { |msg| content_tag(:li, msg) }.join
    html = <<-HTML
    <div id="error_explanation">
      <h2>エラーが発生しました</h2>
      <ul>#{messages}</ul>
    </div>
    HTML

    html.html_safe
  end
  # セッションキーの削除
  def expire_data_after_sign_in!
    # session.keys will return an empty array if the session is not yet loaded.
    # This is a bug in both Rack and Rails.
    # A call to #empty? forces the session to be loaded.
    session.empty?
    session.keys.grep(/^devise\./).each { |k| session.delete(k) }
  end
  # サインアップ後のリダイレクト先
  def after_sign_up_path_for(resource)
    '/registrationfinished'
  end

registrationconfirm.liquid.haml

---
title: ユーザー登録メール送信済
slug: registrationconfirm
listed: false
published: true
cache_strategy: none
response_type: text/html
---
{% extends 'parent' %}
{% block main %}
.row
  .large-8.columns
    %h1 仮登録完了
    入力されたメールアドレスに確認のメールをお送りしました。メール本文に書かれているURLをクリックして登録を完了させてください。
{% endblock %}

registrationfinished.liquid.haml

---
title: ユーザー登録完了
slug: registrationfinished
listed: false
published: true
cache_strategy: none
response_type: text/html
---
{% extends 'parent' %}
{% block main %}
.row
  .large-8.columns
    %h1 登録完了
    ユーザー登録が完了し、ログイン済です。
{% endblock %}

routes.rb

  devise_for :users, :controllers => {
    :registrations => 'users/registrations',
    :confirmations => 'users/confirmations'
  }

user.rb

class User < Liquid::Drop
  include Mongoid::Document
…
end

userregistration.liquid.haml

---
title: ユーザー登録
slug: userregistration
listed: false
published: true
cache_strategy: none
response_type: text/html
position: 4
---
{% extends 'parent' %}
{% block main %}
.row
  .large-8.columns
    %h1 ユーザー登録ページ
    .error {{error}}
    %form#new_user.new_user{"accept-charset" => "UTF-8", :action => "/users", :method => "post"}
      .hidden
        {% csrf_param %}
        %input{:name => "utf8", :type => "hidden", :value => "✓"}/
      %div
        %label{:for => "user_email"} Email
        %br/
        %input#user_email{:autofocus => "autofocus", :keyev => "true", :mouseev => "true", :name => "user[email]", :size => "30", :type => "email", :value => "{{user.email}}"}/
      %div
        %label{:for => "user_password"} Password
        %br/
        %input#user_password{:keyev => "true", :mouseev => "true", :name => "user[password]", :size => "30", :type => "password"}/
      %div
        %label{:for => "user_password_confirmation"} Password confirmation
        %br/
        %input#user_password_confirmation{:keyev => "true", :mouseev => "true", :name => "user[password_confirmation]", :size => "30", :type => "password"}/
      %div
        %input{:name => "commit", :type => "submit", :value => "Sign up"}/
{% endblock %}