Fix/6855 browsable api extra action

[dlfoerster]

refs #6855

Summary

• Avoid object-level permission checks when rendering synthetic OPTIONS form metadata in the browsable API.
• Keep DELETE/edit permission behavior unchanged.
• Add regression coverage for extra actions returning serializer-backed data with incompatible serializer instances, plus a delete-permission guardrail test.

Test plan

• .venv/bin/pytest tests/test_renderers.py::BrowsableAPIRendererTests

[Copilot]

Pull request overview

Fixes a browsable API crash for ViewSet extra actions by preventing object-level permission checks when generating the synthetic OPTIONS form metadata (issue #6855).

Changes:

• Special-case OPTIONS handling in BrowsableAPIRenderer.get_rendered_html_form() to avoid object-level permission checks against serializer.instance.
• Add regression coverage reproducing the crash scenario for extra actions returning serializer.data.
• Add a guardrail test ensuring DELETE form rendering still respects object-level permission checks.

Reviewed changes

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

File	Description
rest_framework/renderers.py	Adjusts browsable API form generation to skip object-permission checks for synthetic OPTIONS placeholders.
tests/test_renderers.py	Adds regression tests for issue #6855 and verifies DELETE still enforces object permissions.

Comments suppressed due to low confidence (1)

rest_framework/renderers.py:515

• The new OPTIONS special-casing duplicates show_form_for_method() logic (allowed_methods + permission check) and makes the later if method in ('DELETE', 'OPTIONS') branch effectively unreachable for OPTIONS. Consider reusing show_form_for_method(view, method, request, obj=None) here (to skip object permissions) and then simplifying the later condition to only handle DELETE, to keep the control flow in one place and avoid future divergence.

            if method == 'OPTIONS':
                # The browsable API only needs a placeholder for OPTIONS, so
                # avoid object-level permission checks against serializer.instance.
                if method not in view.allowed_methods:
                    return
                try:
                    view.check_permissions(request)
                except exceptions.APIException:
                    return
                return True

            if not self.show_form_for_method(view, method, request, instance):
                return

            if method in ('DELETE', 'OPTIONS'):
                return True  # Don't actually need to return a form

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