Some serialization BS

webapp/models.py

@@ -108,6 +108,11 @@ class SignupForm(models.Model):
     def signups(self):
         return Signup.objects.filter(signupForm=self).order_by('pk')
 
+    @property
+    def isOpen(self):
+        now = timezone.now()
+        return self.start_time <= now and now < self.end_time
+
     class Meta:
         verbose_name = _('Signup form')
         verbose_name_plural = _('Signup forms')