actionpack/lib/action_controller/new_base/layouts.rb


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module ActionController
  module Layouts
    def render_to_string(options)
      if !options.key?(:text) || options.key?(:layout)
        options[:_layout] = options.key?(:layout) ? _layout_for_option(options[:layout]) : _default_layout
      end
      
      super
    end
  end
end