CODEWITHSUNDEEP
hl7-fhir
Steve Borman
Steve Borman

Reputation: 375

How do I use Hl7.Fhir.Rest client to search for HealthCareService's

I am completely new to FHIR and have stumbled upon this NuGet package "Hl7.Fhir.STU3" and want to use it to search for Healthcare Services as defined here: https://digital.nhs.uk/developer/api-catalogue/e-referral-service-fhir#api-Default-a010-patient-service-search.

I so far have this limited code and understand I need to pass some form of search criteria but have no idea how to proceed. All I ever get back from the NHS client is:

"Root object has no type indication (resourceType) and therefore cannot be used to construct an FhirJsonNode. Alternatively, specify a nodeName using the parameter."

My code is:

var settings = new FhirClientSettings
        {
            Timeout = 10,
            PreferredFormat = ResourceFormat.Json,
            PreferredReturn = Prefer.ReturnMinimal,
        };

        var client = new FhirClient("https://sandbox.api.service.nhs.uk/referrals/FHIR/STU3/HealthcareService/$ers.searchHealthcareServicesForPatient", settings);
        client.RequestHeaders.Add("Authorization", "Bearer g1112R_ccQ1Ebbb4gtHBP1aaaNM");
        client.RequestHeaders.Add("nhsd-ers-ods-code", "R69");
        client.RequestHeaders.Add("nhsd-ers-business-function", "REFERRING_CLINICIAN");
        client.RequestHeaders.Add("X-Correlation-Id", Guid.NewGuid().ToString());

        var services = client.Search<HealthcareService>();

I would really appreciate any assistance.

Upvotes: 0

Views: 1043

Answers (1)

Mirjam Baltus
Mirjam Baltus

Reputation: 2299

The URL you have set as your FHIR server endpoint is actually the URL for the operation call, so that will not work. If you set the server URL to "https://sandbox.api.service.nhs.uk/referrals/FHIR/STU3/", you should be able to use the FhirClient to do an operation call:

// Note that you have to send parameters in with your request, so set them up first:
var params = new Parameters();
params.Add("requestType", new Coding("https://fhir.nhs.uk/STU3/CodeSystem/eRS-RequestType-1", "APPOINTMENT_REQUEST"));
// etc...

var result = c.TypeOperation<HealthcareService>("ers.searchHealthcareServicesForPatient", params);

The $ sign in the original url is not part of the operation name, so I have omitted that in the request. The FhirClient will add the $ on the outgoing request.

Upvotes: 1

Related Questions