I have multiple DataGrid tables in my project, but I cannot figure out what is wrong with this one.

I have created a codesandbox example of my problem. If anyone could help I would appreciate it very much.

It is probably a dumb mistake

codesandbox example

CodePudding user response：

You have declared a field with name license 2 times.

Changing to e.g.

  {
    field: "licence",
    headerName: "Licence start",
    flex: 1,
    valueGetter: (params) =>
      `${moment(params.row.licence.startsAt).format("DD.MM.YYYY") || ""}`
  },
  {
    field: "licence2",
    headerName: "Licence ends at",
    flex: 1,
    valueGetter: (params) =>
      `${moment(params.row.licence.endsAt).format("DD.MM.YYYY") || ""}`
  },

will solve the problem

CodePudding user response：

so the error is because you’re having those bothe fileds at the time (same name),

{
    field: "licence",
    headerName: "Licence start",
    flex: 1,
    valueGetter: (params) =>
      `${moment(params.row.licence.startsAt).format("DD.MM.YYYY") || ""}`
  },
  {
    field: "licence",
    headerName: "Licence ends at",
    flex: 1,
    valueGetter: (params) =>
      `${moment(params.row.licence.endsAt).format("DD.MM.YYYY") || ""}`
  },

removing one of them will solve your issue , you need to make sure how to access the date in other way