reactjs - React Table - 无法访问单元格中的嵌套 JSON 对象

Question

我对反应表有疑问。我需要在表的不同列中使用 subject.subjectName，但我得到一个值为空的错误

columns: [
   {
   Header: 'Subject Name',
   accessor: 'subject.subjectName' // displays properly in table
   },
   {
    Header: 'Delete grade',
    accessor: '_id',
    Cell: ({row: {values}}) => (
       <DeleteButtonWrapper>
          <DeleteButton
           onClick={async () => await deleteGrade(values._id)}>
             {values._id} // can access, displays _id properly
             {values.subject.subjectName}  // cannot access nested value: subject.SubjectName 
          </DeleteButton>
       </DeleteButtonWrapper>
       )
   }
]