Stream: implementers
Topic: Chained searches
Ben Spencer (Oct 10 2017 at 06:06):
I have a few questions on chained searches (https://www.hl7.org/fhir/search.html#chaining):
1) is it possible to combine chained and reverse chained parameters? (contrived examples for Observation: patient._has:Condition:subject:identifier=myid, _has:Procedure:part-of:patient.active=true
2) can a (possibly reverse) chained search specify multiple restrictions on one join? eg search for all patients with an Appointment with status booked today, or all patients with an active EpisodeOfCare for a particularOrganization (I'm assuming that _has:EpisodeOfCare:patient:identifier=myid&_has:EpisodeOfCare:patient:active=true does two separate joins, is this correct?)
3) taking 2) a bit further, can I specify conditions along the join path, eg all patients with an active EpisodeOfCare for an Organization whose name matches 'foo'?
Christiaan Knaap (Oct 10 2017 at 06:58):
1 is possible.
2 is not, except if a Composite SearchParameter is defined on the two components that you want to combine. (You could define and add it yourself on some servers).
3 is not possible, there is not even syntax for it.
NB: If you try it on Vonk, example 1b will fail because of the searchparameter with the hyphen (part-of) - will be fixed soon.
Ben Spencer (Oct 10 2017 at 10:46):
thanks
Michael Calderero (Nov 15 2017 at 16:01):
Hi All - I'd just like to confirm my understanding of chained searching.
The spec says I can (for lack of a better phrase) chain search parameters, like the following contrived example: DiagnosticReport?context.subject.managingOrganization.identifier=http://a.b/c|123
And the spec says I can limit the chain to a particular type. So can I take the following search above and modify it to something like this?: DiagnosticReport?context:Encounter.subject:Patient.managingOrganization:Organization.identifier=http://a.b/c|123
Lloyd McKenzie (Nov 15 2017 at 17:23):
That looks correct to me
Christiaan Knaap (Dec 03 2017 at 20:00):
The format is indeed right. But the managingOrganization is not, the searchparameter for that is called 'organization'.
A good way to find out about this is to simply try the search on one or several of the public test servers: http://wiki.hl7.org/index.php?title=Publicly_Available_FHIR_Servers_for_testing
Last updated: Apr 12 2022 at 19:14 UTC
