在 laravel 中查询此类数据的最佳做法是什么？

Question

我有 3 个表结构，如下所示：-

products

id	name
1	apple
2	orange

branches

id	name
1	Branch 1
2	Branch 2

stocks

id	branch_id	product_id	qty
1	1	1	10
2	1	2	20
3	2	1	30
4	2	2	40

预期结果：-

No.	Name	Branch 1	Branch 2	Total
1	apple	10	30	40
2	orange	20	40	60

下面是我的代码，它正在运行并且可以获得预期的结果，但我不喜欢我的方式，尤其是 $stock[0]->product->name 部分，我认为必须有另一个合适的最好不要循环 blade 中的分支，是否可以在查询中完成所有操作？

StockController

$branches = Branch::get();
$stocks = Stock::get()->groupBy('product_id');

//$stocks->toArray() output
array:2 [
  1 => array:2 [
     0 => array:4 [
        "id" => 1
        "product_id" => 1
        "branch_id" => 1
        "qty" => 10
     ]
     1 => array:4 [
        "id" => 1
        "product_id" => 1
        "branch_id" => 2
        "qty" => 30
     ]
  ]
  2 => array:2 [
     0 => array:4 [
        "id" => 1
        "product_id" => 2
        "branch_id" => 1
        "qty" => 20
     ]
     1 => array:4 [
        "id" => 1
        "product_id" => 2
        "branch_id" => 2
        "qty" => 40
     ]
  ]
]

stock_index.blade.php

@foreach ($stocks as $stock)
            <tr>
                <td>{{ $loop->iteration }}</td>
                <td>{{ $stock[0]->product->name }}</td>
                @foreach ($branches as $branch)
                    <td>{{ $stock->firstWhere('branch_id', $branch->id)->qty ?? 0 }}</td>
                @endforeach
                <td>{{ $stock->sum('qty') }}</td>
            </tr>
@endforeach

Answer 1

希望对您有所帮助

$branches = Branch::pluck('name', 'id');

$query_string = "";

foreach ($branches as $key => $value) {
    $query_string .= "sum(CASE WHEN stocks.branch_id = '". $key ."' THEN stocks.qty END) as " . str_replace(' ', '_', $value) . "_sum , ";
}

$query_string .= 'sum(stocks.qty) as total';

$stocks = Stock::join('products', 'stocks.product_id', '=', 'products.id')->select(
    'products.name as product_name',
    DB::raw($query_string)
)->groupBy('product_id')->orderBy('product_id','asc')->get();

Answer 2

我建议您使用此代码：‌

$query = "";

foreach (Branch::query()->pluck('name', 'id') as $key => $value) {
    $query .= "sum(CASE WHEN stocks.branch_id = '". $key ."' THEN stocks.qty END) as " . str_replace(' ', '_', $value) . "_sum , ";
}

$query .= 'sum(stocks.qty) as total';

$stocks = Stock::query()->join('products', 'stocks.product_id', '=', 'products.id')
    ->select(
        'products.name as product_name',
        DB::raw($query)
    )->groupBy('product_id')
    ->orderBy('product_id','asc')
    ->get();

在 laravel 中查询此类数据的最佳做法是什么？

What is the best practice to query this type of data in laravel?

group-by

laravel