Laravel Eloquent:渴望加载多个嵌套关系

Question

什么laravel说:

$books = App\Book::with('author.contacts')->get();

我需要的是这样的事情

$books = App\Book::with('author[contacts,publishers]')->get();

我们渴望在关系中加载多个关系.

这可能吗？

Answer 1

你可以做

 $books = App\Book::with('author.contacts','author.publishers')->get();

Answer 2

所以，现在你可以尝试

$books = App\Book::with(['author' => function($author){
     $author->with(['contacts', 'publishers'])->get();
}])->get();

Answer 3

Laravel有关急切加载的文档建议将数组中的关系列出如下：

$books = App\Book::with(['author.contacts', 'author.publishers'])->get();

您可以根据需要建立多个关系。您还可以指定如下所示的关系应包括哪些列：

//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();

您还可以如下添加约束：

$books = App\Book::with(['author: id, name, email' => function ($query) {
                                          $query->where('title', 'like', '%first%');
                                     }, 'email', 'author.contacts', 'author.publishers'])->get();

Answer 4

从 Laravel 9 开始，最简洁的方式是嵌套数组：

$books = App\Book::with(['author' => [
             'contacts',
             'publishers'
         ])->get();

参考