Update resource only if it exists, or create if not exists

[Łukasz Dywicki]

I do have a use case which I can not yet fully test, as it's in the works.

Making long story short - I do receive data from external system and I need to import it into FHIR server. Every record I get have external identifier which is appended to resource.

I would like to use transaction endpoint to update resource if it exists or create if not exisats. I know that conditional creation is fine, I tested it, but I have doubts on conditional update without version and search url (Patient?identifier=foo) instead of singular resource (Patient/x). Sample bundle could look like below - first make conditional update and then conditional create (to avoid update of already created resource).

{
  "resourceType": "Bundle",
  "entry": [{
    "fullUrl": "....",
    "resource": {},
    "request": {
      "method": "PUT",
      "url": "Patient?identifier=foo",
      //"If-Match": "??"
    }
   },{
    "fullUrl": "....",
    "resource": {},
    "request": {
      "method": "POST",
      "url": "Patient",
      "If-None-Exist": "identifier=foo"
    }
   }]
}

Main thing in whole scenario is - I do not care about data which could be overriden (because it shouldn't be updated). I just need to create a new snapshot with data I received from 3rd party, thus I don't care about previous version.

Cheers,
Lukasz

[James Agnew]

Unless im missing something, that just sounds like a standard conditional update (no transaction needed). Are there semantics in a conditional update that don't work like you expect?

sent from my phone.

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[Łukasz Dywicki]

Hey James,
At the time I am importing data I do not know if Patient record exists or not. That's why I can not assume that update will always work, more over I don't know precise resource id but only identifier from external system.

Best regards,
Lukasz

[James Agnew]

Hi Lukasz,

A conditional update will create the patient if they don't already exist (i.e. no resources match the search criteria), so that should work fine.

Cheers,

James

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