Laravel 计数多级 groupBy

Question

表格项目:

[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)一个返回类似以下内容的查询:

[
["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

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];
    });