解决报名支付

backend/community/views.py

@@ -93,6 +93,11 @@ class ActivityViewSet(viewsets.ReadOnlyModelViewSet):
                     contact_phone = signup_info.get('phone') or user.phone_number or ''
                     if contact_name: order.customer_name = contact_name
                     if contact_phone: order.phone_number = contact_phone
+                    
+                    # Ensure activity is linked
+                    if not order.activity:
+                        order.activity = activity
+                    
                     order.save()
             
             if not order:
@@ -105,6 +110,9 @@ class ActivityViewSet(viewsets.ReadOnlyModelViewSet):
                 
                 if pending_order:
                     order = pending_order
+                    # Ensure shipping address is up-to-date
+                    order.shipping_address = activity.location or '线下活动'
+                    order.save()
                 else:
                     contact_name = signup_info.get('name') or signup_info.get('participant_name') or user.nickname or 'Activity User'
                     contact_phone = signup_info.get('phone') or user.phone_number or ''
@@ -136,7 +144,8 @@ class ActivityViewSet(viewsets.ReadOnlyModelViewSet):
                     'total': int(activity.price * 100),
                     'currency': 'CNY'
                 },
-                notify_url=wxpay._notify_url
+                notify_url=wxpay._notify_url,
+                attach=f'{{"type":"activity","activity_id":{activity.id}}}'
             )
             
             import json