activemodel/lib/active_model/validations/helper_methods.rb


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module ActiveModel
  module Validations
    module HelperMethods # :nodoc:
      private
        def _merge_attributes(attr_names)
          options = attr_names.extract_options!.symbolize_keys
          attr_names.flatten!
          options[:attributes] = attr_names
          options
        end
    end
  end
end