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Warning: Encountered two children with the same key, `[object Object]`. Keys should be unique so that components maintain their identity across updates. Non-unique keys may cause children to be duplicated and/or omitted — the behavior is unsupported and could change in a future version.
이렇게 오류가 납니다. 다른분 질문을 보니 key에서 createdAt이 문제인 것 같은데 어떻게 수정을 해야할 지 모르겟습니다ㅠ
답변 5
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맞는 것 같아요...
---> index.js:1 Warning: Failed prop type: Invalid prop `post.createdAt` of type `string` supplied to `PostCard`, expected `object`.
in PostCard (at pages/index.js:23)
---> index.js:1 Warning: Encountered two children with the same key, `[object Object]`. Keys should be unique so that components maintain their identity across updates. Non-unique keys may cause children to be duplicated and/or omitted — the behavior is unsupported and could change in a future version.
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createdAt 2020-04-12T08:32:59.000Z
PostCard.js:39 createdAt 2020-04-12T08:32:01.000Z
PostCard.js:39 createdAt 2020-04-10T07:20:10.000Z
PostCard.js:39 createdAt 2020-04-10T07:20:00.000Z
PostCard.js:39 createdAt 2020-04-10T07:04:42.000Z
전부 다른 값이 나옵니다.
그리고 post.id로 했는데도 같은 에러가 나요ㅠㅠ
Warning: Encountered two children with the same key, `[object Object]`. Keys should be unique so that components maintain their identity across updates. Non-unique keys may cause children to be duplicated and/or omitted — the behavior is unsupported and could change in a future version.
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위에서 console.log('createdAt', post.createdAt)을 먼저 해서 값을 확인해보세요. 고유하기만 하면 되므로 post.id 이런 고유값이 더 낫습니다.