Laravel hasMany relationship returning undefined method

Question

I have a Laravel Model:

class Order extends Eloquent{

    protected $table = 'orders';

    public function orderItems(){
        return $this->hasMany('OrderItem');
    }

    public static function findByUserMonthYear($user_id, $month, $year){
        return Order::where('user_id', '=', $user_id)
            ->where('month', '=', $month)
            ->get();
        // ->where('year', '=', $year);
    }

}

And of course I have an OrderItem class

class OrderItem extends Eloquent{ ...

But if I do:

$order = Order::findByUserMonthYear(Auth::user()->id, Date::getDate(), 2014);

$order->orderItems(); 

I get the following:

Call to undefined method Illuminate\Database\Eloquent\Collection::orderItems()

What am I doing wrong? If I were to change the statement to Order::with('orderItems') the relationship seems to work fine, but I'd like to delete all the orderItems associated to the current Order .

Answer 1

Your ->get() within you findByUserMonth is returning a Collection. If this query returns only one collection then use the ->first() instead, but if your query returns multiple results then eager load the results of orderItems like so;

public static function findByUserMonthYear($user_id, $month, $year){
    return self::with('orderItems')->where('user_id', '=', $user_id)
        ->where('month', '=', $month)
        ->get();
    // ->where('user_id', '=', $year);
}

Then you can access the results like so;

@foreach($orders as $order)
    {{$order->orderItem}}
@endforeach

This is because the return being a collection, so you have to loop through them. The use {{$order->orderItem}} to access the results

Im not too sure on this but i think you can delete all the models within a hasMany like so; $order->orderItem()->delete(); as the return of orderItem() is a Query\\Builder instance.

Answer 2

您的第二个类必须是扩展Order类，此行用于OrderItem类：

class OrderItem extends Order {