RubyでScalaのケースクラスっぽいことがしたかったのでStructを使えばよかった ref: https://qiita.com/shrkw/items/79772b6691f1aee94570

file0.rb

class Food
  attr_reader :price, :name
  def initialize(price, name)
    @price = price
    @name = name
  end
end

file0.txt

class Food
  attr_reader :price, :name
  def initialize(price, name)
    @price = price
    @name = name
  end
end

file1.rb

def case_class(*args)
  claz = Class.new
  claz.send :define_method, :initialize, Proc.new do |*iargs|
    args.each_with_index do |arg, idx| 
      self.instance_variable_set("@#{arg}", iargs[idx])
    end
  end
  args.each do |arg|
    claz.send :define_method, arg, Proc.new do
      self.instance_variable_get("@#{arg}")
    end
  end
  claz
end

file1.txt

def case_class(*args)
  claz = Class.new
  claz.send :define_method, :initialize, Proc.new do |*iargs|
    args.each_with_index do |arg, idx| 
      self.instance_variable_set("@#{arg}", iargs[idx])
    end
  end
  args.each do |arg|
    claz.send :define_method, arg, Proc.new do
      self.instance_variable_get("@#{arg}")
    end
  end
  claz
end

file2.txt

[161] pry(main)> Person = case_class :name, :age
=> Person
[162] pry(main)> p1 = Person.new('Adam', 30)
=> #<Person:0x007fdec619be80 @age=30, @name="Adam">
[163] pry(main)> p2 = Person.new('Bob', 14)
=> #<Person:0x007fdec53c29d0 @age=14, @name="Bob">