php - Laravel 查询生成器 - 如何求和？

Question

我正在记录用户一年中每个月的时间条目。时间采用以下格式:hh:mm:ss

示例:08:32:00

以下是我将月份分组的方式:

  $data = $user->times()->whereYear('start_day', 2019)->get();
        $group_months = $data->groupBy(function($entry) {
             return Carbon::parse($entry->start_day)->format('m');
      });

如何对 $group_months 进行求和，以便获得每个月的总时间值？

这是我的多次迁移

Schema::create('times', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->unsignedBigInteger('user_id');
            $table->date('start_day');
            $table->text('category');
            $table->time('start_time');
            $table->time('finish_time');
            $table->time('duration');
            $table->text('notes');
            $table->timestamps();

            $table->foreign('user_id')->references('id')->on('users');

Answer 1

$monthDurations = $user->times()
    ->whereYear('start_day', 2019)
    ->select(
        \DB::raw('SUM(TIME_TO_SEC(duration)) as `month_duration_in_seconds`'),
        \DB::raw('DATE_FORMAT(start_day, "%Y-%m") as `year_month`'),
        'category',
        'user_id'
    )
    ->groupBy(\DB::raw('DATE_FORMAT(start_day, "%Y-%m")'), 'category', 'user_id')
    ->get();