From: 7stud -- <lists@...>
Date: 2012-10-11T11:45:05+09:00
Subject: Re: ghost methods and dynamic methods

class Car
  attr_accessor :color, :model

  def initialize(color, model)
    @color = color
    @model = model
  end
end



class MyClass
  cars = [
  Car.new('red', 'A'),
  Car.new('green', 'B'),
  Car.new('red', 'C'),
]

  @cars = cars

  class <<self
    attr_accessor :cars
  end


  def self.method_missing(meth_name, *args)
    prop = meth_name.to_s.split("where").last[1..-1]

    @cars.select do |car|
      car.send(prop).send(*args)
    end
  end
end

redcars = MyClass.select_cars_where_color('==', 'red')
p redcars

--output:--
[#<Car:0x00000100907378 @color="red", @model="A">, 
#<Car:0x00000100907288 @color="red", @model="C">]

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