record.rb

require "byebug"

class Record < Struct
  def self.new(*members, &block)
    s = Struct.new(*members, &block)
    s.include Initializer
    s
  end

  module Initializer
    def initialize(hsh)
      members = self.class.members
      values = members.map do |sym|
        hsh[sym.to_s] || hsh[sym.to_sym]
      end
      super(*values)
    end
  end
end

if __FILE__ == $0
  
require "test-unit"

class Record::TestCase < Test::Unit::TestCase
  UnnamedRecord = Record.new(:foo, :bar, :baz)
  NamedRecord = Record.new("Name", :foo, :bar, :baz)

  def test_read_from_syms
    rec = UnnamedRecord.new(foo: "foovalue", "bar" => "barvalue")
    assert_equal("foovalue", rec.foo)
    assert_equal("barvalue", rec.bar)
    assert_nil(rec.baz)
  end

  def test_named_record
    rec = NamedRecord.new(foo: "foovalue", "bar" => "barvalue")
    assert_equal("foovalue", rec.foo)
    assert_equal("barvalue", rec.bar)
    assert_nil(rec.baz)
  end
end

end