$diff operation fails

[christophe spielmann]

Hello,

I would like to use the $diff operation,

in the documentation it is somehow confusing:

https://hapifhir.io/hapi-fhir/docs/server_jpa/diff.html

I tried among other stuffs:

http://localhost:8880/hapi-fhir-jpaserver/fhir/$diff?from=Patient/107105&to=Patient/107105

but got always something like

"issue": [

{

"severity": "error",

"code": "processing",

"diagnostics": "Invalid request: The FHIR endpoint on this server does not know how to handle GET operation[$diff] with parameters [[from, to]]"

}

Is my call wrong ? or  I need to enable it server side ?

X-Powered-By: HAPI FHIR 4.1.0 REST Server (FHIR Server; FHIR 4.0.0/R4)

i will try on a public server....

[James Agnew]

FWIW: HAPI FHIR 4.1.0 is a really old build, I don't think the $diff operation was added until much later than that. Also, you do need to explicitly register DiffProvider against your server.

Cheers,

James

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[Tauqeer Ahmed]

Hi james,

I have a similar query,  Can you please provide some info on how to register DiffProvider against my server?

Thanks.

[James Agnew]

In a JPA server, you'd need to @Autowire it so that boot gives you an instance (or ask the spring context for an instance of DiffProvider) and then register it against the RestfulServer by calling myRestfulServer.registerProvider(myDiffProvider);

If this isn't already happening in the JPA Starter project, certainly a PR to add it would be welcomed.

Cheers,

James

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[Tauqeer Ahmed]

Thanks james,
It worked for me. But wanted to know if there is anything that can compare multiple entries at a time, without having to provide ID's as such.

Thanks,

Ahmed.

[James Agnew]

I'm not sure I follow. How would it know what to compare if you don't provide an ID?

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