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Asked: 2026-05-20T12:17:31+00:00

I saw someone’s code in View/car.html.haml like followows: %body =yield Can anybody explain me

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I saw someone’s code in View/car.html.haml like followows:

%body
  =yield

Can anybody explain me the use of “=yield” here?

-where can I find the actual body part code?

-What does it means,

-why use it or in what situation we should use it?

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1 Answer

  1. Editorial Team

    Typically this will appear in a layout file (by default – views/layouts/application.html.haml). It simply tells Rails to render the content of the current action at that location.

    So if you have views/layouts/application.html.haml with:

    %body
  =yield

    And you have views/posts/index.html.haml with:

    %h1 This is the posts index page!  :D

    Then when you go to an action that renders the posts index page (probably /posts), you will see the html that has that heading rendered at the location of the yield in your layout file:

    <body>
  <h1>This is the posts index page! :D</h1>
</body>

    This is particularly useful to include things like common page navigation markup, or headers that should show up on all pages without having to re-define the exact html in every view.

    If you have a different layout for a separate section of your site you might render your view in the controller like this:

    def index
  if signed_in?
    render :layout => 'application'
  else
    render 'user/unauthorized', :layout => 'external' and return
  end
end

    Which will use the specified view, rendered inside the specified layout wherever the layout’s yield occurs. In the else of the statement user/unauthorized.html.haml would be rendered within the layouts/external.html.haml layout, and in the signed_in? case you would get the posts/index.html.haml view rendered within the layouts/application.html.haml layout.

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