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Laravelのexists/uniqueバリデータでNULL/NOT NULLの扱い

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Laravelのバリデータ、便利です。

でも、NULLチェックの扱いではまってしまいましたので、
メモ書きしておきます。

existsとかuniqueバリデータで値をチェックする際、
"is null"の場合は、NULLを記述しましょう。

ex)
'staff_id' => 'exists:staffs,id,deleted_at,NULL',

[注意!] null/Nullは不可です。
Laravelコアの中で、リテラルで"NULL"となっていることに依ります。

ちなみに、not nullは
NOT_NULLを指定しましょう。

ex)
'staff_id' => 'exists:staffs,id,section_id,NOT_NULL',

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