diff --git a/app/Models/UserPurchase.php b/app/Models/UserPurchase.php
index f46b4d7..7c0e6ed 100644
--- a/app/Models/UserPurchase.php
+++ b/app/Models/UserPurchase.php
@@ -32,6 +32,14 @@ class UserPurchase extends Model
         return $this->belongsTo(User::class);
     }
 
+    /**
+     * 购买记录对应的商品（shopItem 别名，兼容婚姻系统调用）
+     */
+    public function item(): BelongsTo
+    {
+        return $this->belongsTo(ShopItem::class, 'shop_item_id');
+    }
+
     /**
      * 购买记录对应的商品
      */