title: Core Data - Changing attributes type
body: <p>I have a project and I am using core data.</p>
  
  <p>I have some entities, with attributes. When I started the project I choose some atributes and now I want to change their types (Int to String for example).  ANd so I did it.</p>
  
  <p>THe thing is, I am getting errors... </p>
  
  <p>I checked the code, I think every thing is ok.
  I even deleted the entire entity and made a new one with some name but it doesn't work.</p>
  
  <p>How can I change it with success?</p>