activemodel/lib/active_model/attributes.rb


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require 'active_support/core_ext/object/instance_variables'

module ActiveModel
  module Attributes
    def attributes
      instance_values
    end

    def read_attribute(attr_name)
      instance_variable_get(:"@#{attr_name}")
    end

    def write_attribute(attr_name, value)
      instance_variable_set(:"@#{attr_name}", value)
    end
  end
end