laravel OrderBy和sum

Question

这个问题看起来很傻，但这让我感到烦恼。

 ----------------------------------------------------------------
 | account_id | order_id | sales | profit | currency | date     |
 |---------------------------------------------------|-----------
 |    10      |   100    | 550   |  10    | USD      |2016-10-11|
 |    10      |   101    | 144   |  4     | NZD      |2016-10-12|
 |    9       |   102    | 429   |  44    | NZD      |2016-10-13|
 |    10      |   103    | 797   |  80    | NZD      |2016-10-14|
 ----------------------------------------------------------------

我想按货币计算利润总和

$account = App\Account::find(10);

$collection = $account
                ->orders()                # relation between order and account
                ->completedLastMonth()    # scope of dates,
                ->groupBy('currency')     # group by currency
                ->sum('profit')           # sum of profit

但是$collection是94。

所以我想要像这样的结果

$collection = [
    'USD' => 10,       # total profit of USD 10 for account 10
    'NZD' => 84        # total profit of NZD 80 + 4 = 84 for account 10
]

我有帐户和订单与上个月范围之间的关系逻辑，请帮我查看汇总和GROUP BY

Answer 1

$account = App\Account::find(10);
$collection = $account
                ->orders()                # relation between order and account
                ->completedLastMonth()    # scope of dates,
                ->groupBy('currency')     # group by currency
                ->selectRaw('sum(profit) as sum, currency')
                ->lists('sum','currency');