A foreign key in MySQL was a column plus a JOIN you wrote each time. In Eloquent it becomes a method returning a relationship object: read as a property ($order->customer) it runs once and is cached on the model; called ($customer->orders()) it is a builder you can filter, count and write through. The models are Eloquent Models's plus Category, Review, Address, Image and Tag; output starting with -- lines ran with the Eloquent Models query listener, and long SQL is wrapped. Each arrow below starts at the model that declares the method. Query counts are Eager Loading.
