Laravel WithSum() 别名

Question

我想对“abseces”表中“from”和“to”列之间的差异进行求和。但我收到此错误：“未找到列：1054 '字段列表'中的未知列'absences.hours_difference'”

$classesAbsences = Classes::withSum(['absences' => function ($query) {
       $query->selectRaw('TIMESTAMPDIFF(HOUR, `from`, `to`) AS hours_difference');
   }
   ], 'absences.hours_difference')
   ->get();

Answer 1

您可以将 TIMESTAMPDIFF 与 raw select 一起使用：

$classesAbsences = Classes::withSum(['absences' => function ($query) {
       $query->selectRaw('TIMESTAMPDIFF(HOUR, `from`, `to`) AS hours_difference');
   }
   ], 'absences_hours_difference')
   ->get();