here's the laravel eloquent relationships in simple example(from docs).
1- one-to-one
2- one-to-many
3- many-to-many
4- has-one-through
5- has-many-through
6- one-to-one-polymorphic
7- one-to-many-polymorphic
8- Many-to-many-polymorphic
9- has-one-of-many
