n

backend/community/models.py

@@ -47,6 +47,13 @@ class Activity(models.Model):
             return self.banner.url
         return self.banner_url
 
+    @property
+    def current_signups(self):
+        """
+        当前有效报名人数
+        """
+        return self.signups.exclude(status='cancelled').count()
+
     def __str__(self):
         return self.title