I am struggling to write a firebase rule that is checking the user id that is stored in a document. Hardcoding a given value as a string works

```
allow write: if request.auth.uid == 'user-id-hardcoded';

```

,however I am unable to find a way to dynamically address it. I am left with the impression it's due to the hyphen in the document field after checking this question - [Firebase security rules : How can I use dashes or hyphen in paths?](https://stackoverflow.com/questions/55660266/firebase-security-rules-how-can-i-use-dashes-or-hyphen-in-paths). I also tried to substitute user-id with userId to no avail.

```
allow write: if request.auth.uid == resource.data.user-id;

```

Any help will be appreciated.