如何在Laravel中使用辅助键获取记录

Question

我已经搜索了解决方案，但找不到完美解决此问题的方法。我有两个类似下面的模型

class Payments extends Model
{
    protected $table = 'payments';

    public function investment_()
    {
        return $this->belongsTo('App\Investments', 'investment_id', 'id');
    }

}

和

class Investments extends Model
{
    protected $table = 'investments';

    public function payments_()
    {
        return $this->hasMany('App\Payments', 'investment_id', 'id');
    }
}

[付款有一个金额栏，而投资也有一个金额栏。

仅在特定投资的总付款额至少为投资金额的一半的情况下，如何才能提取所有付款？

我不知道如何构造查询，以便付款可以选择其相应的投资价值并检查条件。

这是我到目前为止在控制器中拥有的$payments = Payments::where('amount', '>=', Investment::where('id', Payments::where(?)))->get();

注意：我不知道在问号中加什么或我的方法是否正确。

这是一个错误的示例查询，可以更好地说明它

SELECT a.SUM(a.amount) AS amount FROM payments as a, investments as b where a.investment_id = b.id and a.sum(a.amount)*2 = b.amount GROUP BY a.investment_id;

Answer 1

查询只是

SELECT a.SUM(a.amount) AS amount 
FROM payments as a JOIN investments as b 
     ON a.investment_id = b.id 
GROUP BY a.investment_id
HAVING SUM(a.amount)*2 < b.amount;

您可以在Laravel Query构建器元素中轻松翻译thin，但是如果您只需要此，则可以使用DB::select('query')来获取它们

Answer 2

希望这可以解决您的问题。请检查。谢谢

\App\Payment::where(function ($query) {
            $query->whereRaw('(select SUM(payment_amount) from payments as payments_final where investment_id = payments.investment_id) >= (select investment_amount/2 from investments where id=payments.investment_id)');
        })
        ->get();