jdaugherty commented on issue #14503:
URL: https://github.com/apache/grails-core/issues/14503#issuecomment-4375499276
There's 2 options here:
Option 1 - match the sql standard
(url=X, method=POST) → validated, saved ✓
(url=X, method=null) → validation skipped, saved ✓
(url=X, method=null) → validation skipped, saved ✓ ← duplicates allowed
The DB unique index (in PostgreSQL/MySQL) also won't catch those duplicates,
since both treat NULLs as distinct.
Option 2 - null check
(url=X, method=POST) → saved ✓
(url=X, method=null) → no match, saved ✓
(url=X, method=null) → finds first null row, validation error ✗
Option #2 doesn't function like the sql standard, but option 1 does.
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