Fix: Add Unique..., BaseUniqueForValidators type add

[Limsunoh]

…ator to validators

I have made things!

Serializer.validators now has the Unique... validators type added to it.

Related issues

Format is:

• Refs Serializer.validators type does not include Unique... validators #555
• Refs Serializer.validators type does not include Unique... validators #555

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[intgr]

This change shouldn't be necessary.

• UniqueValidator should already be accepted because it conforms to the ContextValidator protocol.

• UniqueTogetherValidator and BaseUniqueForValidator should in fact not be accepted for FooField(validators=[...]) value

  These can only be used in a Serializer Meta class, e.g. see example code in documentation https://www.django-rest-framework.org/api-guide/validators/#uniquetogethervalidator

But this was quite tricky to figure out, it would help if it was explained in a comment.

And the Validator type alias would be better called FieldValidator.

[intgr]

As I understand, what was asked in the original issue

• Serializer.validators type does not include Unique... validators #555

was actually different. The Serializer class inherits a validators property from Field class (@property def validators(self) -> list[Validator[_VT]] from Field class.

What it doesn't account for is that in case of Serializer class, validators in that case actually can include UniqueTogetherValidator and others.

[intgr]

Doh! I wrote these comments a week ago, but forgot to submit the review. Sorry!