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class User extends Model
{
    /**
     * »ñÈ¡ÓëÓû§Ïà¹ØÁªµÄËùÓж©µ¥¡£
     */
    public function orders()
    {
        return $this->hasMany('AppOrder');
    }
}

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$user = User::find(1);

// »ñÈ¡ÓëÓû§Ïà¹ØÁªµÄËùÓж©µ¥
$orders = $user->orders;

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// »ñÈ¡ÓëÓû§Ïà¹ØÁªµÄ¼ÛÇ®Áè¼Ý10ÔªµÄ¶©µ¥
$orders = $user->orders()->where('price', '>', 10)->get();

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$order = Order::find(1);

// ×÷·Ï¸Ã¶©µ¥ÓëÖ®¹ØÁªµÄÓû§
$order->user_id = null;
$order->save();

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$user = User::find(1);

// ×÷·Ï¸ÃÓû§ÓëÏà¹ØÁª¶©µ¥Ö®¼äµÄ¹Øϵ
$user->orders()->update(['user_id' => null]);

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