Wsrtjtyk

I have this parent class:

class ListBase

  @@list = 



  def self.list

    @@list

  end

end

I'm trying to create two child classes like so:

class Child1 < ListBase

end



class Child2 < ListBase

end

I was under the impression that each of these child classes will have their own @@list class variable. However, I get this:

Child1.list.push(1)

Child2.list.push(2)

Child1.list # => [1, 2]

Child2.list # => [1, 2]

which means the child classes share the @@list from the parent class.

How can I create a separate class variable for each of the child classes without repeating?

As @CarySwoveland comments, in your use case, you should use a class instance variable:

class ListBase

  @list = 



  def self.list

    @list

  end

end

Not even sure why you thought of using a class variable for your use case.

You are using class variable through class method (getter/reader).

So you can override that method in derived classes and use own class variable for every derived class.

Not fun, but that how class variables works, they are shared within a class and derived classes as well.

class ListBase

  def self.list

    @@base_list ||= 

  end

end



class ListOne

  def self.list

    @@one_list ||= 

  end

end



class ListTwo

  def self.list

    @@two_list ||= 

  end

end



ListOne.list << 1

ListTwo.list << 2



puts ListOne.list

# => [1]

puts ListTwo.list

# => [2]