我正在使用Yii2 basic。我有一个名为groupsavingdetails的表，它保存每月的组保存。
我有ID为29的组的2017年8月的记录。同样，我有这个特定组的2017年9月、10月、11月和12月的记录。还有这个组的2018年1月和3月的数据，如图所示。

其过程是：8月份本集团没有录入（即第一次录入数据，期初余额设置为0），现在9月份取8月份得期末余额作为期初余额，以此类推，所以这些是有依赖关系得。

**现在的情况是，当我想更改9月份的记录时，其期末余额将被更改，因此新的期末余额将被设置为10月份的期初余额，依此类推。**我应该如何操作？

下面是actionUpdate函数，它给我的错误是调用数组上的成员函数保存（）

public function actionUpdate($id) {
        $model = $this->findModel($id);

        if (Yii::$app->request->isAjax && $model->load(Yii::$app->request->post())) {
            Yii::$app->response->format = Response::FORMAT_JSON;
            return ActiveForm::validate($model);
        }

        if ($model->load(Yii::$app->request->post())) {

            $count = Yii::$app->db->createCommand('SELECT COUNT(*) FROM groupsavingdetails WHERE ((groupsavingdetails.GroupId=:Id and Year>=:year and Month>:month) OR (GroupId=:Id and Year>:year AND Month>0))')->bindValues([':Id' => $model->GroupId, ':year' => $model->Year, ':month' => $model->Month]->queryAll();

            if ($count == 0) {

            }

            if ($count == 1) {

            }

            if ($count > 1) {

                if ($model->LoanGiven != 0) {
                    $model->TotalValueofLoanGiven += $model->LoanGiven;
                }

                if ($model->LoanRecovery != 0) {
                    $model->LoanRepaidUptilNow += $model->LoanRecovery;
                }

                $model->TotalValueOfLoanOutstanding = $model->TotalValueofLoanGiven - $model->LoanRepaidUptilNow;

                $model->ClosingBalance = ($model->OpeningBalance + $model->TotalSaving + $model->LoanRecovery + $model->LoanInterest + $model->Fine + $model->BankInterest + $model->BankLoan - $model->Expenses - $model->LoanGiven);

                $groups = Yii::$app->db->createCommand('SELECT * FROM groupsavingdetails WHERE ((groupsavingdetails.GroupId=:Id and Year>=:year and Month>:month) OR (GroupId=:Id and Year>:year AND Month>0))')->bindValues([':Id' => $model->GroupId, ':year' => $model->Year, ':month' => $model->Month])->queryAll();

                foreach ($groups as $k => $group) {
                    if ($k == 0) {

                        $groups[$k]['OpeningBalance'] = $model->ClosingBalance;
                        $groups[$k]['TotalValueofLoanGiven'] = $model->TotalValueofLoanGiven;
                        $groups[$k]['LoanRepaidUptilNow'] = $model->LoanRepaidUptilNow;
                        $groups[$k]['TotalValueOfLoanOutstanding'] = $model->TotalValueOfLoanOutstanding;
                    }
                }

                $groups->save();   // Here it gives me error even if i write $groups[$k]->save()

                $model->save();

                return $this->redirect(['view', 'id' => $model->GroupSavingDetailsId]);
            }
        } else {
            return $this->render('update', ['model' => $model,]);
        }
    }