title: Core Data Relationship
body: <p>I am creating a Travel Guide iPhone app. I created a <code>city</code> <code>Entity</code> in Core Data. It has <code>name</code>, <code>image</code>, and <code>description</code> attributes. Now I want to show restaurants and famous places according to selected cities in another view. Each city may have a number of restaurants and famous places.  So I decided to create one other <code>Entity</code>, <code>place</code>. I am confused about the relationship between <code>city</code> and <code>place</code>.  I want to make the <code>city</code> id as foreign key in place...what should I do?</p>