Fixes #6777: Fix default value validation for custom text fields

docs/release-notes/version-2.11.md

@@ -6,6 +6,7 @@
 
 * [#5442](https://github.com/netbox-community/netbox/issues/5442) - Fix assignment of permissions based on LDAP groups
 * [#6773](https://github.com/netbox-community/netbox/issues/6773) - Add missing `display` field to rack unit serializer
+* [#6777](https://github.com/netbox-community/netbox/issues/6777) - Fix default value validation for custom text fields
 * [#6778](https://github.com/netbox-community/netbox/issues/6778) - Rack reservation should display rack's location
 * [#6780](https://github.com/netbox-community/netbox/issues/6780) - Include rack location in navigation breadcrumbs
 

netbox/extras/models/customfields.py

@@ -149,7 +149,8 @@ class CustomField(BigIDModel):
         # Validate the field's default value (if any)
         if self.default is not None:
             try:
-                self.validate(self.default)
+                default_value = str(self.default) if self.type == CustomFieldTypeChoices.TYPE_TEXT else self.default
+                self.validate(default_value)
             except ValidationError as err:
                 raise ValidationError({
                     'default': f'Invalid default value "{self.default}": {err.message}'