Accessing instance variables from an inherited class

ruby-talk
1

Hi,

The below code accesses the value of an instance variable

class Object_References
  attr_reader :obj_1, :obj_2

  def initialize
    @obj_1 = "Object_1"
    @obj_2 = "Object_2"
  end

end

ref = Object_References.new
puts ref.obj_1
puts ref.obj_2

But how can I access the same value in a subclass?

class Whatever < Object_References

#how can I access the above objects variables here

end

Thanks

Aidy

2

Alle venerdì 16 novembre 2007, aidy ha scritto:

Hi,

The below code accesses the value of an instance variable

class Object_References
  attr_reader :obj_1, :obj_2

  def initialize
    @obj_1 = "Object_1"
    @obj_2 = "Object_2"
  end

end

ref = Object_References.new
puts ref.obj_1
puts ref.obj_2

But how can I access the same value in a subclass?

class Whatever < Object_References

#how can I access the above objects variables here

end

Thanks

Aidy

You can access them as you would in the base class:

class A

  def initialize
    @x = 2
  end

end

class B < A
  
  def puts_x
    puts @x
  end

  def x=(value)
    @x = value
  end

end

b = B.new
b.puts_x
b.x=3
b.puts_x

Output:
2
3

I hope this helps

Stefano