Ruby: Object's attribute out of reach

Hi everyone,

I have a very interesting problem, I dont know why I am so confused about it, here my problem is

- !ruby/object:Opportunity
    created_at: 2009-03-28 11:29:58

    position_title: Software Engineer4
    id: "4"
  attributes_cache: {}

Above is my output by using debug(@parent), I want to access

position_title :Software Engineer4

of this object but I am totally unable to access a single attribute of this object. Can anyone help me?