App\services\BankAccountService::getExpenses PHP 메소드

    private function getExpenses($bankId = null)
    {
        $expenses = Expense::scope()->bankId($bankId)->where('transaction_id', '!=', '')->withTrashed()->get(['transaction_id'])->toArray();
        $expenses = array_flip(array_map(function ($val) {
            return $val['transaction_id'];
        }, $expenses));
        return $expenses;
    }