Ruby - Access instance variables of called class

Question

I have two classes Book::Utils, Table::Utils and I calling one class from the other which are not parent-child classes.

If I call class2 from class1 -> In class2, can we access already present class1 instance variables?

module Table
  attr_accessor :account_id
  class Utils
     def initialize(params)
       @account_id = params[:account_id]
     end

     def calculate
       book = Book.new
       final_account_id = book.get_account_id
       return final_account_id
     end
  end
end

module Book
  class Utils

    def get_account_id
      # Here I want to access Table's instance variables
      # Like @account_id + 20
    end
  end
end

I am calling Table::Utils.new({account_id: 1}).calculate

Expected result : 21 Can we achieve this?

Answer 1

You need to pass instance of the class you need to call and then you can use accessors:

module Table
  attr_accessor :account_id
  class Utils
     def initialize(params)
       @account_id = params[:account_id]
     end

     def calculate
       book = Book.new
       final_account_id = book.get_account_id(self)
       return final_account_id
     end
  end
end

module Book
  class Utils

    def get_account_id(table)
      table.account_id + 20
    end
  end
end

or just pass the value that is needed

module Table
  attr_accessor :account_id
  class Utils
     def initialize(params)
       @account_id = params[:account_id]
     end

     def calculate
       book = Book.new
       final_account_id = book.get_account_id(account_id)
       return final_account_id
     end
  end
end

module Book
  class Utils

    def get_account_id(other_id)
      other_id + 20
    end
  end
end