Is it possible to search on reference type only?

1

I’d like to search for all observation performed by patients. Is it possible?

I’m using HAPI FHIR JPA Server 5.1.0 which does not support the negation, which could have been a work around in our case.

I’ve tried:

  • performer=Patient
  • performer=Patient/*
  • performer:Patient=*
  • performer:Patient
  • performer:Patient.gender:missing=false
  • performer:Patient.gender:missing=true

I’ve found out that some parameters :missing need to be somehow activated (though there is no info of this in the result, if it’s a subquery like the one above), and that if done, it will have a bad performance (see dao docs)

What is the best way of searching for patient made observations?