actionpack/lib/action_view/helpers/tags/checkable.rb


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module ActionView
  module Helpers
    module Tags
      module Checkable
        def input_checked?(object, options)
          if options.has_key?("checked")
            checked = options.delete "checked"
            checked == true || checked == "checked"
          else
            checked?(value(object))
          end
        end
      end
    end
  end
end