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app/Services/BackflowService.php

@@ -25,7 +25,11 @@ class BackflowService extends BaseService
         $backflow = static::$MODEL::where('date', $data['date'])
             ->where('member_id', $memberId)->first();
         if ($backflow) {
-            $backflow->update($data);
+            if ($changeAmount > 0) $field = "recharge_amount";
+            else $field = 'withdrawal_amount';
+            $backflow->backflow_ratio = $data['backflow_ratio'];
+            $backflow->increment($field, $changeAmount);
+            $backflow->save();
         } else {
             $backflow = static::$MODEL::create($data);
         }