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

This is also possible. we can do by model itself.

class Invoices extends Eloquent {

    public function payments()
    {
        return $this->hasMany('Payments')
            ->selectRaw('SUM(payments.amount) as payment_amount')
            ->groupBy('id'); // as per our requirements.
        }
    }
}

Note SUM(payments.amount)

payments is tableName

amount is fieldName