Fix form validation issue in UPS host update

ups_management/ups_manager/views.py

@@ -118,17 +118,15 @@ class UPSHostUpdateView(UpdateView):
         return context
     
     def form_valid(self, form):
-        context = self.get_context_data()
-        battery_formset = context['battery_formset']
-        
         self.object = form.save()
         
-        if battery_formset:
-            battery_formset.instance = self.object
-            battery_formset.save()
+        if self.request.POST:
+            battery_formset = BatteryFormSet(self.request.POST, instance=self.object)
+            if battery_formset.is_valid():
+                battery_formset.save()
         
         messages.success(self.request, 'UPS主机和电池信息已更新')
-        return redirect(self.success_url)
+        return super().form_valid(form)
 
 
 class UPSHostDeleteView(DeleteView):