用 whereHas 和关系列的总和查询

Question

我有一个查询，要使用关系 table 中的值总和来添加自定义“余额”列。

User::withCount(['transactions as balance' => function($query) {
     $query->select(\DB::raw('sum(credit_movement)'));
}]);

这对 returning “余额”栏很有效。

现在，我想过滤有关“余额”列的用户。

->where('balance', '<', 0);

如果我将它链接到查询，它将不起作用，因为“余额”列不存在。

User::withCount(['transactions as balance' => function($query) {
     $query->select(\DB::raw('sum(credit_movement)'));
}])
->where('balance', '<', 0);

我试过使用

User::withCount(['transactions as balance' => function($query) {
     $query->select(\DB::raw('sum(credit_movement)'));
}])
->having('balance', '<', 0); // won't work

// also:
->havingRaw('balance < 0'); // won't work

但是 none 这些作品。

Unknown column 'balance' in 'having clause'

我希望查询 return 仅余额小于 0 的用户。（我想在查询生成器中实现它，而不是在集合中 ->filter()。

更新：

我尝试使用 whereHas() 但无法正确编写

User::withCount(['transactions as balance' => function($query) {
     $query->select(\DB::raw('sum(credit_movement)'));
}])
   ->whereHas('transactions', function($q) {
      $q->whereRaw('sum(credit_movement), < ?', 0);
   });

Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' < ?)

Answer 1

终于成功了：

User::whereHas('transactions', function($q) {
   $q->select(\DB::raw('SUM(credit_movement) as balance'))
       ->havingRaw('balance < 0');
   });
});

用 whereHas 和关系列的总和查询

Query with whereHas and sum of relationship column

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