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Editorial Team
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Asked: 2026-06-07T11:02:14+00:00

I have the following little problem. In layout I yield to content_for to set

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I have the following little problem.

In layout I yield to content_for to set up some classes on my body tag:

<body class="<%= yield(:body_classes) %>

They I would like to call content_for

<%= content_for(:body_classes, "one") %>

So far so good. I use content_for for the second time:

<%= content_for(:body_classes, "two") %>

In my HTML I get the following:

<body class="onetwo">

Is there an elegant way to separate those two classes by space? I can think of couple of hacky solution, but nothing feels right…

Many Thanks!

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1 Answer

  1. Editorial Team

    I don’t think content_for is a good fit in this case. However, you can solve the problem elegantly with a couple of helper methods (extracted from one of my Rails projects):

    def klass(*classes)
  @classes = [] if @classes.nil?
  @classes += classes
  @classes.uniq!
  nil
end

def has_klass?(klass)
  !@classes.nil? && @classes.include?(klass)
end

def body_klasses
  @classes.map(&:to_s).join(" ") rescue nil
end

    Usage in templates:

    <%= klass :one, :two %>
<%= klass :three %>

    In the layout, determine if a certain class is set:

    <% if has_klass? :one %>

    And finally…

    <body class="<%= body_klasses %>">

    You can further customize these to better suit your needs.

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