Stream: implementers
Topic: FHIR Path question
Brian Reinhold (Jan 18 2022 at 14:00):
Trying to figure out how to get the value of something which is in a collection. IN my case I am thinking of getting the value of the Observation.component whose code.coding.code is equal to some value. As I play with the syntax using this test site https://hl7.github.io/fhirpath.js/
I can get single expressions to evaluate to true and get values but I cannot figure out the right syntax to get a value conditionally. In a program I could do it in multiple lines but I thought the idea here is that I can specify a single path to get the value I want out of the collection.
Lloyd McKenzie (Jan 18 2022 at 14:45):
Observation.component.where[code.coding.where(code='foo' and system='bar')).value
Brian Reinhold (Jan 18 2022 at 15:16):
@Lloyd McKenzie Thanks, I wasn't going down 'deep enough'. I needed the second 'where'. I tried directly with
Observation.component.where(code.coding.code='150021').value
and that just gave me an empty response.
Brian Postlethwaite (Jan 21 2022 at 23:45):
You may need a .exists() on the inner where in HAPI
Last updated: Apr 12 2022 at 19:14 UTC
