更新集合值

Question

我正在尝试更新Collection中的一个列，但似乎没有什么能起作用。尝试过update、$kk->amount = 100和['amount'] = 100，但这些都不起作用。

$newReturnBoxes = collect([
        {
            "boxable_id": 2,
            "box_id": 1,
            "boxable_type": "return",
            "amount": 3,
            "created_at": "2022-03-29T08:29:03.000000Z",
            "updated_at": "2022-03-29T08:29:03.000000Z"
        },
        {
            "boxable_id": 3,
            "box_id": 1,
            "boxable_type": "return",
            "amount": 4,
            "created_at": "2022-03-29T08:32:02.000000Z",
            "updated_at": "2022-03-29T08:32:02.000000Z"
        },
        {
            "boxable_id": 3,
            "box_id": 2,
            "boxable_type": "return",
            "amount": 2,
            "created_at": null,
            "updated_at": null
        }
    ]);

$returnBoxes->each(function ($trx) use ($newReturnBoxes) {
            $amount = $trx->amount;
            $boxId = $trx->box_id;

            if ($newReturnBoxes->contains('box_id', $boxId)) {
                // Already contains key, increment amount
                $kk = $newReturnBoxes->firstWhere('box_id', $boxId);
                $kk['amount'] = 100; // actually want to increase prev amount with current amount
                
            } else {
                $newReturnBoxes->push([
                    'box_id' => $boxId,
                    'amount' => $amount
                ]);
            }
        });

Answer 1

可能问题是您没有通过引用传递$newReturnBoxes。

试着替换这个：

use ($newReturnBoxes)

在这方面：

use (&$newReturnBoxes)

参考资料：https://www.php.net/manual/en/language.references.pass.php