Providing default content for section in layout(rails 3 .erb)

Is it possi开发者_如何学Pythonble to provide default content for section in layout if it is not overridden in view?

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if you are using, say a title tag in your head section of your application.html.erb layout file, you could do something as simple as <%= @title || "Some Default App Content" %>

Using this same approach, you can use it for content_for and other helper methods.

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Now, Rails have content_for? method for it: http://api.rubyonrails.org/classes/ActionView/Helpers/CaptureHelper.html#method-i-content_for