laravel 嵌套关联模型如何写

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

Model A {
public function getB(){
return $this-hasMany(B::class,"b_id","a_id");
}
}

Model B{
public function getC(){
return $this-hasOne(C::class,"c_id","b_id");
}
}

Model C{

}

A::with("getB.getC")->paginate(10);Copy

 模型 A 中定义
public function b(){
    return $this->hasMany(B::class);
}Copy

 模型 B 中定义
public function c(){
    return $this->hasOne(C::class);
}Copy

控制器
public function getA(){
    rerurn A::with('b'=>function($query){
                $query->with('c');
           })->get();
}Copy