respond_to?

# File activemodel/lib/active_model/attribute_methods.rb, line 486
    def respond_to?(method, include_private_methods = false)
      if super
        true
      elsif !include_private_methods && super(method, true)
        # If we're here then we haven't found among non-private methods
        # but found among all methods. Which means that the given method is private.
        false
      else
        !matched_attribute_method(method.to_s).nil?
      end
    end