Ruby on Rails

> You have not shown us the code where you set expensescounter_id, or
> the code that you expect that value to be set. You have shown us the
> code where expenses_counter.id would be setup but presumably
> expensescounter_id is an attribute of a different object.

I following "Agile web development with rails 3.2" book.

Yes, expensescounter_id is an attribute.

I use that attribute in line_item.rb file like as follow:

class LineItem < ActiveRecord::Base
attr_accessible :quantity_id, :expensescounter_id

belongs_to :quantity
belongs_to :expensescounter
end

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