Support bundle-local reference resolution from the FHIRPath resolve function

[abedultamimi]

entry.first().resource.eventCoding.code='medication-dispense' implies entry.first().resource.focus.all( $this.resolve() is MedicationDispense)

i'm trying this constraint but without any luck, any idea how resolve works in ibm fhir. i also tried:
entry.first().resource.eventCoding.code='medication-dispense' implies entry.first().resource.focus.all( resolve() is MedicationDispense)

[lmsurpre]

Hi @abedultamimi, can you give a little more info about what you're trying to do and where? What does the reference in question look like that you're trying to resolve?

Our FHIRPath implementation has a built-in function registry. The default resolve function doesn't actually retrieve any resources but instead returns a placeholder so that most expressions can be evaluated without making network connections under the covers.
However, its possible to override that default implementation and in fact our server implementation does just that: https://github.com/IBM/FHIR/blob/main/fhir-server/src/main/java/com/ibm/fhir/server/listener/FHIRServletContextListener.java#L230-L234

Ensure your fhirServer/core/serverResolveFunctionEnabled property is set to true in fhir-server-config to enable that feature.
Also note that, in neither case, will we make a network connection to an external server to dereference an absolute reference.

[abedultamimi]

Hi @lmsurpre ,

Thanks for taking time to review this, my intention is to have this validated resolving other bundle entry.

Assuem that i have a bundle of 2 entries like the below:

1. MedicationRequest
2. Patient ( fullurl is http://xyz.com/Patient/123)

And im having a MedicationRequest.subject as "Patient/123"

Xyz.com is an arbitrary value not equal to fhir server base url.
My question is can resolve work against bundle entries or it needs to be server resources.

Thanks Again

[lmsurpre]

Hi @abedultamimi sorry for the delay. I think the answer is that our current ResolveFunction implementation does not support the "Resolving references in Bundles" algorithm outlined at https://www.hl7.org/fhir/bundle.html#references

I'm debating between:
A. turning this issue into a feature request for that feature; or
B. labeling this one as a question, closing it, and opening a separate feature request for that feature

Let me know if you have a preference. I will do A if we don't hear back soon.

[lmsurpre]

@abedultamimi I believe this limitation is now addressed in our main branch. are you able to try it out and confirm this is working for you?

[lmsurpre]

Closing due to lack of response. We believe this is covered sufficiently in the updated ResolveFunction implementation to be shipped with 4.11.