How to apply subtraction in the query in laravel? - laravel

Question

I have one array which contains all the records. I am passing all those records to a loop and there I am getting the sum of the clear column which has null upto.
This part is working fine, now my requirement is I want to add one more check which is based on the one more column refund.
If any column contains refund=1 that amount should be subtracted from the total, can you please help me to achieve the scenario
foreach ($row_data as $key => $value) {
$data_arr[$key]['total'] = ['Price'=> $value->whereIn('clear', null)->sum('amount')];
}
Data
data = [
{'amount' => 55, 'clear' => 'null', 'refund' => '0'},
{'amount' => 5, 'clear' => 'null', 'refund' => '1'},
{'amount' => 10, 'clear' => 'null', 'refund' => '0'},
];
Expected result is :-60
ACtual Result is :- 70

Answer 1

reduce should help.
$data = [
['amount' => 55, 'clear' => null, 'refund' => '0'],
['amount' => 5, 'clear' => null, 'refund' => '1'],
['amount' => 10, 'clear' => null, 'refund' => '0'],
];
You can be very explicit
// sum if refund is 0, substract if refund is 1
$sum = collect($data)
->where('clear', null)
->reduce(function ($carry, $item) {
if ($item['refund'] == '0') {
return $carry + $item['amount'];
} elseif ($item['refund'] == '1') {
return $carry - $item['amount'];
}
}, 0);
Or write it a bit shorter
// sum if refund is 0, substract otherwise
$sum = collect($data)
->where('clear', null)
->reduce(fn($carry, $item) => ($item['refund'] == '0')
? $carry + $item['amount']
: $carry - $item['amount']);
You can even do it without collections using php's array_reduce and array_filter functions. Works pretty much in the same way.
$sum = array_reduce(
array_filter($data, function ($item) {
return $item['clear'] == null;
}),
function($carry, $item) {
return $item['refund'] == '0'
? $carry + $item['amount']
: $carry - $item['amount'];
});
$sum = array_reduce(
array_filter($data, fn($item) => $item['clear'] == null)
fn($carry, $item) => $item['refund'] == '0'
? $carry + $item['amount']
: $carry - $item['amount']
);

Answer 2

I don't have all your code with variable declaration so I created logic snippet with your use case.
EDIT: You can simply get your total amount and substract you total refund as you can see in code below
/** #var Collection $data */
$data = collect([
['amount' => 55, 'clear' => null, 'refund' => false],
['amount' => 5, 'clear' => null, 'refund' => true],
['amount' => 10, 'clear' => null, 'refund' => false],
]);
$totalAmount = $data->whereNull('clear')->sum('amount');
$totalRefund = $data->whereNull('clear')
->where('refund', true)
->sum('amount'); // = 5
$subValue = $totalAmount - $totalRefund