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Ruby On Rails Interview Questions and Answers

Ques. What is the purpose of Layouts in Ruby on Rails?
Ans.

Layouts are partial ruby/html files that are used to render the content pages. 

There are placed in the folder: app/views/layouts

Items that you would typically put in this folder are things like headers/footers, navigation elements, etc.

Here’s a sample layout file: /app/views/layout/application.html.erb

<html lang="en">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <title>Learning System | <%= @page_title || 'Admin Area' %></title>
    <meta name="author" content="Anil Punjabi">
    <%= stylesheet_link_tag('public', 'admin', :media => 'all') %>
    <%= javascript_include_tag('application') %>
  </head>
  <body>
    <div id="header">
      <h1>Learning System</h1>
    </div>
    <div id="main">
      <% if !flash[:notice].blank? %>
      <div class="notice">
        <%= flash[:notice] %>
      </div>
      <% end %>
      <div id="content">
        <%= yield %>
      </div>
    </div>
    <div id="footer">
      <p id="copyright">© / Anil Punjabi</p>
    </div>
  </body>
</html>
Say you are trying to access the page as shown below:
Then the contents of the index.html.erb would be placed above in the section shown under <% yield %> above and sent back to the user.
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