I have two files in my directory, one which is garage.rb & another called car.rb.
car.rb file just holds a car object:
class Car
end
garage.rb file is as follows:
require 'car.rb' #Makes car class accessible in garage.rb
class Garage
def initialize
@capacity = []
end
attr_accessor :capacity
end
When I make a new instance of a car by calling car = Car.new, how do I put car object in the @capacity array my default?
Essentially, whenever I call car = Car.new, I want car to be put in the @capacity array instantly.
I understand that I could make a function like so:
def add_car_to_garage(car)
capacity << car
end
But, I want the car to start in the garage when it is created, so I don't want a method to add it to the array, I just want it to automatically start there when the instance of car is created.
Any advice would be appreciated. Thank you.
You can use the ObjectSpace module with each_object method inside your Car class to define method to keep track for each living instances, like this:
class Car
def self.all
ObjectSpace.each_object(self).to_a
end
end
require_relative 'car' # Makes car class accessible in garage.rb
class Garage
def initialize
@capacity = Car.all
end
attr_accessor :capacity
end
car1 = Car.new
car2 = Car.new
car3 = Car.new
garage = Garage.new
print garage.capacity # => [#<Car:0x0000563fa14128c8>, #<Car:0x0000563fa1412918>, #<Car:0x0000563fa1412990>]
Also note, I have used require_relative to include car.rb class which is in the same directory.
Edit for comment question and Cary Swoveland suggestion:
class Car
end
require_relative 'car' # Makes car class accessible in garage.rb
class Garage
def initialize; end
def capacity
ObjectSpace.each_object(Car).to_a
end
end
car1 = Car.new
garage = Garage.new
car2 = Car.new
print garage.capacity # => [#<Car:0x000055d7bd236a00>, #<Car:0x000055d7bd236b18>]
Also note, I removed attr_accessor :capacity, since you don't need it in this case.