Custom structure for extensions on elements.

[Linden Quan]

I have a custom profile that has extensions on an Resource element. For example:
{
  "resourceType": "Patient",
  "active": true,
  "gender": "male",
  "birthDate": "1970-01-01",
  "_birthDate": {
    "extension": [
      {
        "url": "http://example.com/fhir/StructureDefinition/date-type",
        "valueString": "A"
      }
    ]
  }
}

The element "birthDate" has an extension.
I'm not sure how I can define this with HAPI fhir client. I found the related documentation.

However the documentation only mentioned how to add extensions to the Resource, but not to an element.

Thanks very much for your help !

[Patrick Werner]

Hi Linden,

You can see how to do this in the doc as well:

https://hapifhir.io/hapi-fhir/docs/model/profiles_and_extensions.html

In the doc an extension is added to Patient.given.

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[Linden Quan]

Thanks for your comments. The example in the doc is helpful. Do you happen to know how I can have a custom Patient class that defines extension ?
for example something like this
@ResourceDef(name="Patient", profile="http://example.com/StructureDefinition/mypatient")
public class MyPatient extends Patient {
 @Extension(url="http://example.com/fhir/StructureDefinition/date-type", onField="birthDate")
 private StringType birthDateType;

[alejandro...@gmail.com]

Hello Linden,

You need to declare the extension  and set to the "getBirthDateElement()

Patient newPatient = new Patient();
// Define the extension
Extension birthplace = new Extension();
// Define the Address
Address address = new Address();
address.setCountry("Chile");
// Set the Address to the extension
birthplace.setUrl("http://hl7.org/fhir/StructureDefinition/patient-birthPlace");
birthplace.setValue(address);
// Add the birthdate
newPatient.setBirthDateElement(new DateType("2015-11-18"));
// Set the extension to the birthdate Element
newPatient.getBirthDateElement().addExtension(birthplace);

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--

______________________________

Alejandro Sebastián Medina Negrete

Ingeniero Civil en Computación

[Ian Bacher]

I’d think creating a custom structure is probably overkill for this. There are some docs here on using extensions: https://hapifhir.io/hapi-fhir/docs/model/profiles_and_extensions.html, but really all you need is:

patient.getBirthDateElement().addExtension("http://example.com/fhir/StructureDefinition/date-type", new StringType("A"));

- Ian

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[Linden Quan]

Thanks very much !

[Linden Quan]

Thanks very much !