限购bug修复

app/Api/Controllers/DrugController.php

@@ -105,13 +105,17 @@ public function drugLimit(Request $request)
             ->get();
 
         $drugCounts = [];
-        foreach ($prescriptions as $prescription) {
-            $drugs = json_decode($prescription->drugs, true); // Parse JSON data
-            foreach ($drugs as $drug) {
-                $drugId = $drug['drug_id'];
-                $drugCounts[$drugId] = ($drugCounts[$drugId] ?? 0) + $drug['num'];
+        // 判断搜索出来的处方不为空
+        if ($prescriptions->count() > 0) {
+            foreach ($prescriptions as $prescription) {
+                $drugs = json_decode($prescription->drug_info, true); // Parse JSON data
+                foreach ($drugs as $drug) {
+                    $drugId = $drug['drug_id'];
+                    $drugCounts[$drugId] = ($drugCounts[$drugId] ?? 0) + $drug['num'];
+                }
             }
         }
+
         $purchaseCount = $drugCounts[$drug_id] ?? 0;
 
         // 计算获取剩余可买的次数