Simplify date handling and fix form_valid logic

ups_management/ups_manager/views.py

@@ -118,14 +118,21 @@ class UPSHostUpdateView(UpdateView):
         return context
     
     def form_valid(self, form):
-        self.object = form.save()
         context = self.get_context_data()
         battery_formset = context['battery_formset']
+        
         if battery_formset.is_valid():
+            self.object = form.save()
             battery_formset.instance = self.object
             battery_formset.save()
-        messages.success(self.request, 'UPS主机和电池信息已更新')
-        return redirect(self.success_url)
+            messages.success(self.request, 'UPS主机和电池信息已更新')
+            return redirect(self.success_url)
+        else:
+            return render(self.request, self.template_name, {
+                'form': form,
+                'battery_formset': battery_formset,
+                'object': self.object,
+            })
 
 
 class UPSHostDeleteView(DeleteView):