FHIR Transform: Implement Resource "Prune" Feature

[arnejduranovic]

User Story

As a writer of receiver-based FHIR enrichments, I want the ability to REMOVE resources from a bundle that match a particular FHIR expression, so that I can create a bundle that meets a receiver's Observation filtering requirements.

Description/Use Case

Presently ReportStream's FHIR expressions allow for SELECTING resources and their properties in a FHIR bundle and setting their value. This ticket aims to now implement the ability to remove resources as well that match a particular "resource" expression.

This ticket does not define the syntax that shall be used in the .yml file, but the following is an example of something that could work:

  - name: sr-specimen-collection-bodysite-display
    resource: 'Bundle.entry.resource.ofType(Specimen)'
    condition: '%resource.collection.bodySite.coding.display.exists().not()'
    value: [ '%remove' ]

The above config would remove all Specimen resources that did not have a display value for collection.bodySite.coding

Risks/Impacts/Considerations

Dev Notes

• This solution should have a way to handle references that get broken when a resource is deleted. For example, in the picture below, if the highlighted Observation is removed from the bundle, the reference to it in the DiagnosticReport object should be as well.

Acceptance Criteria

• [ ] Ability to prune resources added to ReportStream FHIR transforms

[Andrey-Glazkv]

Hey team! Please add your planning poker estimate with Zenhub @adegolier @arnejduranovic @brick-green @david-navapbc @jack-h-wang @jalbinson @JFisk42 @mkalish @thetaurean