热切加载laravel关系深厚


Eager loading laravel 3 deep relationship

我得到了一个与州和国家相关的模型城市。

当调用与城市a相关的模型时,得到城市但状态返回null。

我查询

Agent::with(array('city','city.state'))->find($id);

my model city

class City extends Eloquent
{
    public static $table = 'city';
    public function State()
    {
        return $this->belongs_to('State','state_id');
    }
}

使用封闭方法应该可以…

// Like this...
Agent::with(array('city' => function($query){
    $query->with('state'); 
}))->find($id);
// Also, I would keep my model relationship methods lowercase
class City extends Eloquent
{
    public static $table = 'city';
    //public function State()
    public function state() // like this
    {
         return $this->belongs_to('State','state_id');
    }
}

向下滚动到下面链接的"约束急切负载",查看正在使用的封装方法https://tower.la.utexas.edu/index.php/docs/database/eloquent急切的