如何使用 Laravel eloquent/collections 计算 PHP 中相似键的总量

Question

我目前有 API 返回的以下 json 响应。我可以使用 Laravel Eloquent 将其退回。有几个用户，每个用户都有几张收据。收据具有类型和状态。我想尝试获取与其类型和状态相关的每张收据的总金额。我能够使用

返回以下 json 响应

$this->user->with('receipts')->has('receipts')->get(['id', 'name']);

我尝试过使用多种 laravel 集合方法https://laravel.com/docs/5.8/collections#available-methods 但我仍然无法得到想要的响应。

    {
        "id": 1,
        "name": "kent",
        "receipts": [
            {
                "id": 1,
                "user_id": 1,
                "type_id": 1,
                "status": 0,
                "amount": 100
            },
            {
                "id": 2,
                "user_id": 1,
                "type_id": 1,
                "status": 0,
                "amount": 100
            },
            {
                "id": 3,
                "user_id": 1,
                "type_id": 2,
                "status": 1,
                "amount": 50
            },
            {
                "id": 4,
                "user_id": 1,
                "type_id": 2,
                "status": 0,
                "amount": 30
            },
            {
                "id": 5,
                "user_id": 1,
                "type_id": 2,
                "status": 0,
                "amount": 30
            },
            {
                "id": 6,
                "user_id": 1,
                "type_id": 1,
                "status": 0,
                "amount": 20
            },
            {
                "id": 7,
                "user_id": 1,
                "type_id": 1,
                "status": 1,
                "amount": 10
            }
        ]
        },
        {
            "id": 2,
            "name": "allison",
            "receipts": [
                {
                    "id": 9,
                    "user_id": 2,
                    "type_id": 1,
                    "status": 0,
                    "amount": 20
                }
        ]
    }
]

我希望得到以下内容

    {
        "id": 1,
        "name": "kent",
        "receipts": [
            {
                "performance and deleted": 220,
                "performance and not deleted": 10,
                "project and deleted": 60,
                "project and deleted": 50
            }
        ]
    },
    {
        "id": 2,
        "name": "allison",
        "receipts": [
            {
                "performance and deleted": 20,
                "performance and not deleted": 0,
                "project and deleted": 0,
                "project and not deleted": 0
            }
        ]
    }
]

Answer 1

您可以使用 foreach 和其他循环来制作您想要的 json！ 使用此函数将您的集合转换为您想要的 json：

public function convert(Collection $collection) 
{
    $result_collection = $collection;
    $payment_collections = [];
    foreach ($result_collection->receipts as $receipt)
    {
        $payment["type_id${receipt->type_id} and status${$receipt->status}"] = $receipt->amount;
    }
    $result_collection->receipts = $payment_collections;
    return $result_collection;
}

这与获取总金额的方法相同。只需放置一个 foreach 并将每个数量添加到初始化为 0 的变量中；

还有其他方法，例如在您的资源集合中更改 toArray 函数。

Answer 2

你应该能够得到金额的总和

$this->user->with(['receipts' => function($query) {
    $query->selectRaw("SUM(amount) as amount, type_id, status, user_id")->groupBy('type_id', 'status', 'user_id');
}])->has('receipts')->get(['id', 'name']);

您可以使用收集方法来获得所需的输出

$this->user->with(['receipts' => function($query) {
    $query->selectRaw("SUM(amount) as amount, type_id, status, user_id")->groupBy('type_id', 'status', 'user_id');
}])->has('receipts')->get(['id', 'name'])
->each(function ($user) {
    $user->setRelation(
        'receipts',
        $user->receipts->mapWithKeys(function ($receipt) {
            return [
                $receipt->type_id . ' and ' . $receipt->status => $receipt->amount // format the key as you wish
            ];
        })
    );
})

Answer 3

我编写脚本时假设您的数据是一个 PHP 数组，因此您可以更改我的代码的某些部分。 例如你可以改变：

$row['receipts']
// To 
$row->receipts

不管怎样

// The function in your controller
function index(){
  $users=User::whereHas('receipts')->with('receipts')->get()->toArray();
  return convert($users);
}
// The helper function 
function convert($data){
  $data=collect($data);
$allTypes=[];
$allStatuses=[];
return $data->each(function($row) use (&$allTypes,&$allStatuses){
    $types=collect($row['receipts'])->pluck('type_id')->toArray();
    $statuses=collect($row['receipts'])->pluck('status')->toArray();
    $allTypes=array_unique(array_merge($allTypes,$types));
    $allStatuses=array_unique(array_merge($allStatuses,$statuses));
})->map(function ($row,$index) use (&$allTypes,&$allStatuses){
    $result=[];
    $receipts=collect($row['receipts']);
    foreach ($allTypes as $type){
        foreach ($allStatuses as $status){
            $result["type_id {$type} and status {$status}: "]=$receipts->where('type_id',$type)->where('status',$status)->sum('amount');
        }
    }
    $row['receipts']=$result;
    return $row;
});
}