Fixing Conditional UniqueConstraint Validation in Django REST Framework

说明与用途

修复 Django REST Framework 中条件 UniqueConstraint 的验证错误，恢复序列化器的正确行为并提升代码质量。

问题

DRF serializers incorrectly rejected valid data when using Django UniqueConstraint with conditions, breaking API development.

结果

The PR closed a year‑old bug, restoring correct serializer validation for conditional UniqueConstraints and improving code quality by removing dead code and performance regressions.

工作流

• Identify abandoned PR by nefrob
• Rebase and resolve initial merge conflicts
• Add missing helper get_referenced_base_fields_from_q
• Iteratively resolve three new merge conflicts as main advanced
• Use GitHub Copilot to detect four hidden bugs
• Fix bugs: empty fields, lost messages, condition revalidation, nulls_distinct edge case
• Receive review from MehrazRumman, remove dead helper code, eliminate performance regression
• Apply fixes, delete unnecessary lines
• Submit final review, receive approval, merge PR

证据

The bug was subtle but serious: DRF's serializer validation was rejecting perfectly valid data when using Django's UniqueConstraint with conditions.

来源

I fixed four bugs found by GitHub Copilot.

来源

After 17 commits, 26 comments, and more than a month of back-and-forth, the PR was approved and merged by a DRF maintainer.

来源