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?

mrzasa · Accepted Answer · 2018-03-15 12:16:01Z

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

answered Mar 15, 2018 at 12:16

mrzasa

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3 Comments

Sk. Irfan Over a year ago

For 1 instance variable the solution is known. But its for many instance variables( params > 10)

mrzasa Over a year ago

What do you mean many instance variables? Just pass a class instance and then use accessors.

Sk. Irfan Over a year ago

Ur first solution works i.e., book.get_account_id(self). Ideally I should pass more than 1 param in this. Ex: get_account_id(@account_id, @user_id, @sync_id......etc). Passing self solves the problem. Thanks

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