Question

#layouts/application.html.haml
    %title
     = yield(:title) || "Default page title"
     = " | DefaultSite.com"


#application_helper.rb
 def title(page_title)
    content_for(:title) { page_title }
  end

Even if I don’t set a title (helper method) for a page, "Default page title" never shows. Instead of it, "" (the value of yield(:title)) appears for some reason.

Why is this happening?

Answer 1

This is just part of the design of Rails. You can’t change this behaviour.

You should instead check if yield(:title).empty? is true or false in order to see if the content_for(:title) was called.

For example, instead of:

yield(:title) || "Default page title"

you want:

(yield(:title).empty? ? "Default page title" : yield(:title))

This just checks whether it is empty, and applies the default if it is empty, or else uses the title.