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Another question is it possible to check for the existance of a partial object in an array of object.

let say we have

`[{companyId: "company1"}, {companyId: "company2"}]` and I want to do something like

`{companyId: request.principal.attr.companyId} in request.resource.attr.companies`

Yep, you could use `exists` for this, something like
```request.resource.attr.companies.exists(c, c.companyId == request.principal.attr.companyId)```