Laravel Eloquent - How Can I Sum fields inside relation's column? - php

Question

I need to sum every paid_amount inside of each expense_payment_liab instead of returning all these
individual paid_amount as it can be seen in images for clear view.So far my query looks like this:
Model Relation is like Voucher has many Expenses and Expenses has many Expensepaymentliab.
This is so far what I tried:
$expense = Voucher::where('voucher_date', $request->date)
->where('account_id', 1)
->with(['expenses' => function ($expense) use ($date) {
$expense->with(['expPaymentLiab' => function ($inner) use ($date) {
return $inner->select('paid_amount', 'expense_id')->where('paid_date', '=', $date);
//need to return the sum of paid_amount.
// I've also tried this
//$inner->sum('paid_amount')
// $inner->sum('paid_amount', 'expense_id')
}]);
$expense->select('id', 'date', 'total_amount', 'voucher_id');
}])->get();
These are the images please check
Need to sum such paid_amount field.

Answer 1

You can use withCount to sum the paid_amount field.
Voucher::where('voucher_date', $request->date)
->where('account_id', 1)
->with(['expenses' => function ($expense) use ($date) {
// select the columns first, so the subquery column can be added later.
$expense->select('id', 'date', 'total_amount', 'voucher_id');
$expense->withCount(['expPaymentLiab AS paid_sum' => function ($query) use ($date) {
return $query->select(DB::raw('SUM(paid_amount)'))->where('paid_date', '=', $date);
}]);
}])
->get();