报名表单

backend/community/serializers.py

@@ -8,18 +8,23 @@ class ActivitySerializer(serializers.ModelSerializer):
     signup_form_config = serializers.SerializerMethodField()
     current_signups = serializers.IntegerField(read_only=True)
     has_signed_up = serializers.SerializerMethodField()
+    is_signed_up = serializers.SerializerMethodField()
     
     class Meta:
         model = Activity
         fields = '__all__'
 
     def get_has_signed_up(self, obj):
+        return self.get_is_signed_up(obj)
+
+    def get_is_signed_up(self, obj):
         request = self.context.get('request')
         if not request:
             return False
         user = get_current_wechat_user(request)
         if user:
-            return obj.signups.filter(user=user).exists()
+            # Check if there is a valid signup (not cancelled)
+            return obj.signups.filter(user=user).exclude(status='cancelled').exists()
         return False
 
     def get_signup_form_config(self, obj):