Laravel Sum of relation

Question

I want to return the sum of \"amount\" from my payments table. There can be many payments for one invoice. The below \"->sum(\'amount\') does not work, it returns:

Call

Answer 1

class Invoices extends Eloquent {

    public function payments()
    {
        return $this->hasMany('Payments');
    }
}

class Payments extends Eloquent {

    public function invoices()
    {
        return $this->belongsTo('Invoices');
    } 
}

In your controller

Invoice::with(['payments' => function($query){
   $query->sum('amount');
}])->get();

;