Laravel 计数多级 groupBy

Question

table 项目 :

[created_at => 2020-08-12 06:00:00, type =>2]
[created_at => 2020-08-12 07:00:00, type =>1]
[created_at => 2020-08-12 08:00:00, type =>1]
[created_at => 2020-08-11 12:00:00, type =>3]
[created_at => 2020-08-11 21:00:00, type =>3]

我想编写 (Laravel 7) 一个 returns 类似的查询：

[
["date"=>"2020-08-12","amount"=>3, "type1"=>2, "type2"=>1],
["date"=>"2020-08-11", "amount"=>2, "type3"=>2],
]

如何进行多级分组和计数？

Answer 1

您可以通过一些查询生成器和一些集合来实现此目的：

return DB::table('items')
         ->selectRaw('DATE_FORMAT(created_at, "%Y-%m-%d") as date, type, COUNT(type) as count')
         ->groupBy('date', 'type')
         ->orderBy('date', 'desc')
         ->get()
         ->reduce(function ($summary, $item) {
             if (! $summary->has($item->date)) {
                 $summary->put($item->date, collect([
                     'date' => $item->date,
                     'amount' => $item->count
                 ]));
             } else {
                 $amount = $summary->get($item->date)['amount'];
                 $summary->get($item->date)->put('amount', $amount + $item->count);
             }
             
             $summary->get($item->date)->put('type'.$item->type, $item->count);
             
             return $summary;
         }, collect())
         ->values()
         ->toArray();

你可以看看这个implode有工作代码

Answer 2

数据形状与您想要的不完全相同，但我添加了一些我认为有用的有意义的键。

return DB::table('types')->get(['created_at', 'type'])
    ->groupBy(fn ($item) => Carbon::parse($item->created_at)->format('Y-m-d'))
    ->map(function ($item, $key) {
        $details = $item->map(fn ($type) => $type->type)
            ->unique()->map(fn ($i) => ['type'.$i => $item->sum(fn ($type) => $i === $type->type ? 1 : 0)]);

        return ['date' => $key, 'amount' => $item->count(), 'details' => $details];
    });

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