Ruby on Rails | provideヘルパーでlayoutにパラメータを引き渡す

概要

provideヘルパーでlayoutにパラメータを引き渡す

内容

layoutに動的にパラメータを引渡したいような場合に
provideヘルパーを利用します。

呼び元

- yield(:key)

呼び先

- provide(:key, value)

サンプル

view/layouts/application.html.haml

!!!
%html
  %head
    %title Rails4demo
    = stylesheet_link_tag    "application", media: "all", "data-turbolinks-track" => true
    = javascript_include_tag "application", "data-turbolinks-track" => true
    = csrf_meta_tags
  %body
    - if yield(:title)
      %h1 
        =yield(:title)
    - if current_user
      login user : 
      = current_user.name
    %hr/ 
    =render :partial => "application/menu"
    =render :partial => "application/message"
    = yield

view/application/_menu.html.haml

-if @menu_display
  = link_to '新規登録', :controller => 'user', :action => 'new'
  = link_to 'サインアウト', :controller => 'signin', :action => 'signout'

view/application/_message.html.haml

-if @message_display
  - unless flash[:message].blank?
    %div
      %p 
        =flash[:message]
      %hr/

/view/signin/index.html.haml

- provide(:title, "BookShelfSystem")
=form_tag("/signin/signin") do
  %p 
    =label_tag 'login', 'login'
    =text_field_tag 'login'
  %p 
    =label_tag 'password', 'Password'
    =password_field_tag 'password'
  %p 
    =submit_tag 'submit'