Fix duplicate validation errors for GenericIPAddressField with protocol

[browniebroke]

Description

Adding follow up fixes on top of:

• Fix duplicate validation errors for GenericIPAddressField with protocol #9982

Since we can't push them and the contributor has become unresponsive...

When a Django model uses GenericIPAddressField(protocol='IPv4') or GenericIPAddressField(protocol='IPv6'), the serializer generates duplicate validation errors for invalid input:

{'address': [
    ErrorDetail(string='Enter a valid IPv4 address.', code='invalid'),
    ErrorDetail(string='Enter a valid IPv4 or IPv6 address.', code='invalid'),
]}

After this fix, only the relevant error message is returned, depending on the accepted protocols by the field.

Fixes #9645
Closes #9647
Closes #9982

[Copilot]

Pull request overview

This PR addresses duplicate validation errors produced by ModelSerializer when mapping Django GenericIPAddressField(protocol='IPv4'/'IPv6') to DRF’s IPAddressField, ensuring only the protocol-relevant validator/message is used.

Changes:

• Pass the model field’s protocol through get_field_kwargs() when mapping GenericIPAddressField → IPAddressField.
• Filter out Django’s IP address validators (validate_ipv46_address, validate_ipv4_address, validate_ipv6_address) to prevent duplicate validation.
• Add regression tests for protocol='IPv4' and protocol='IPv6' mappings and validation behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
rest_framework/utils/field_mapping.py	Propagates protocol and removes protocol-related Django validators to avoid duplicate errors.
tests/test_model_serializer.py	Adds tests for protocol-specific mapping/validation on GenericIPAddressField.

Suppressed comments (1)

tests/test_model_serializer.py:494

• As above, this only asserts the number of errors. To ensure the duplicate-validator fix is actually returning the protocol-specific error (and not leaving the generic message), assert the expected message for an IPv6-only field.

        s = TestSerializer(data={'address': 'not an ip address'})
        self.assertFalse(s.is_valid())
        self.assertEqual(1, len(s.errors['address']),
                         'Unexpected number of validation errors: '
                         '{}'.format(s.errors))

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

[auvipy]

some python build are failing...

[browniebroke]

some python build are failing...

Yes, looks like GHA is having a moment... 😮‍💨