Laravel Eloquent: eager loading of multiple nested relationships
You can do
$books = App\Book::with('author.contacts','author.publishers')->get();
Laravel documentation on eager loading recommends listing the relationships in an array as follows:
$books = App\Book::with(['author.contacts', 'author.publishers'])->get();
You can have as many relationships as desired. You can also specify which columns should be included for a relationship like this:
//only id, name and email will be returned for author
//id must always be included
$books = App\Book::with(['author: id, name, email', 'author.contacts', 'author.publishers'])->get();
You may also add constrains as follows:
$books = App\Book::with(['author: id, name, email', 'author.contacts' => function ($query) {
$query->where('address', 'like', '%city%');
}, 'author.publishers'])->get();
So, now you can try
$books = App\Book::with(['author' => function($author){
$author->with(['contacts', 'publishers'])->get();
}])->get();