NoMethodError: undefined method `original' for nil:NilClass
validateで上記のエラーが出たら、collectionのpropertyにdefault: []をつける
collection :hoge, default: []
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NoMethodError: undefined method `original' for nil:NilClass
validateで上記のエラーが出たら、collectionのpropertyにdefault: []をつける
collection :hoge, default: []
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