回答編集履歴
1
参考までに、テストを一つ増やした
answer
CHANGED
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@@ -23,4 +23,5 @@
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23
23
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c1 = Cenum.create! a: a1, b: 'abc' # OK
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24
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c2 = Cenum.create! a: a1, b: 'def' # OK
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c3 = Cenum.create! a: a1, b: 'abc' # => ActiveRecord::RecordInvalid
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26
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+
c3 = c1.b_def! # => ActiveRecord::RecordInvalid
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27
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```
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