[data grid] Expanding empty groups

[RomanMain]

The problem in depth

When grouping a column with a null or undefined value, is it possible to create a unique grouping key for such values ​​so that they can be expanded in the same way as other groups?

https://mui.com/x/react-data-grid/row-grouping/#rows-with-missing-groups. It is described here that by default the table will use inline for such values, but perhaps there is some workaround ?

Your environment

`npx @mui/envinfo`

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  Output from `npx @mui/envinfo` goes here.

Search keywords: grouping, expand
Order ID: 82865

[flaviendelangle]

Hi,

You can use the groupingValueGetter prop to return a key ("NO_VALUE" for example)

It would probably be worth adding a doc example (cc @michelengelen)

[michelengelen]

It would probably be worth adding a doc example (cc @michelengelen)

Absolutely! I will add this to the umbrella issue!
Thanks for the ping @flaviendelangle! 🙇🏼

[cherniavskii]

@RomanMain Here's a working demo: https://codesandbox.io/p/sandbox/flamboyant-gates-y7yy2y?file=%2Fsrc%2FDemo.tsx%3A15%2C44