`ModelSerializer` generates validators for[UniqueConstraint](https://docs.djangoproject.com/en/4.0/ref/models/constraints/#uniqueconstraint) (both UniqueValidator and UniqueTogetherValidator)

The`ValidationError` has been aligned with Django's, currently supporting the same style (signature) and nesting.

By default the URLs created by`SimpleRouter` use regular expressions. This behavior can be modified by setting the`use_regex_path` argument to`False` when instantiating the router.

Searches now may contain_quoted phrases_ with spaces, each phrase is considered as a single search term, and it will raise a validation error if any null-character is provided in search. See the[Filtering API guide](../api-guide/filtering.md) for more information.

Model fields' default values are now propagated to serializer fields, for more information see the[Serializer fields API guide](../api-guide/fields.md#default).

There are a number of fixes and minor improvements in this release, ranging from documentation, internal infrastructure (typing, testing, requirements, deprecation, etc.), security and overall behaviour.

Date: 22nd March 2024

* Fix`SearchFilter` handling of quoted and comma separated strings, when`.get_search_terms` is being called into by a custom class. See[[#9338](https://github.com/encode/django-rest-framework/issues/9338)]

* Revert number of 3.15.0 issues which included unintended side-effects. See[[#9331](https://github.com/encode/django-rest-framework/issues/9331)]

Date: 15th March 2024