Using FHIR extension in normal spring rest call

[maz...@gmail.com]

Hi,

I am building a REST API where I have both FHIR and non FHIR resources. All FHIR resources follow the HAPI FHIR RestFulServer implementation, where as other resources are normal Spring Rest APIs using Jackson. I have developed an Extension for FHIR. Now I have few API operations whose input/output type is the FHIR extension. I tried using the extension as is, but the output is not a normal java object to json conversion. Below is the output

{

    "fieldOne": {

        "myCoercedValue": "1",

        "myStringValue": "1"

    },

    "FieldTwo": {

        "myCoercedValue": "2",

        "myStringValue": "2"

    }

}

Ideally, it should have been

{

    "fieldOne": "2",

     "FieldTwo": "2"

}

How can I make use of FHIR extension in my normal API operations that uses Spring Rest with Jackson?

[Mazkozi M]

Adding to it,

My extension is of type BaseIdentifiableElement. I tried using the parsers, but it requires object of type IBaseResource. Tried marking my extension as IBaseResource as well, but it is a clash on method setID(String) between IBaseResource and BaseIdentifiableElement. Not sure if this was the right thing to do, just wanted to get it working somehow.

[Kevin Mayfield]

Are you extending an existing resource.

Wondering if you should be using custom structures instead.

http://hapifhir.io/doc_custom_structures.html

Sent from my iPhone

On 31 Oct 2017, at 06:14, Mazkozi M <maz...@gmail.com> wrote:

Adding to it,

My extension is of type BaseIdentifiableElement. I tried using the parsers, but it requires object of type IBaseResource. Tried marking my extension as IBaseResource as well, but it is a clash on method setID(String) between IBaseResource and BaseIdentifiableElement. Not sure if this was the right thing to do, just wanted to get it working somehow.

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[Mazkozi M]

I can use custom resource. But I am not sure if I can declare my extension as resource as well. I thought extensions should be extending BaseIdentifiableElement always.

[James Agnew]

The problem here is probably that HAPI's structures aren't designed to be encoded directly using a JSON parser like Jackson or GSON, they are intended to use a FHIR-aware parser like HAPI.

For what it's worth, I've solved similar issues in the past by using a Jackson custom serializer. Here's an example from another project I did- This one is using the FHIR 8601 datatype encoding on a field so it's not exactly the same thing, but it's a similar concept.

The field on the data model:

   @JsonProperty("timestamp")
   @JsonSerialize(using = JsonDateSerializer.class)
   @JsonDeserialize(using = JsonDateDeserializer.class)
   private Date myTimestamp;

And the serializer:

public class JsonDateSerializer extends JsonSerializer<Date> {
   @Override
   public void serialize(Date theValue, JsonGenerator theGen, SerializerProvider theSerializers) throws IOException, JsonProcessingException {
      if (theValue != null) {
         theGen.writeString(new InstantType(theValue).getValueAsString());
      }
   }
}

Cheers,

James

On Tue, Oct 31, 2017 at 2:38 AM, Mazkozi M <maz...@gmail.com> wrote:

I can use custom resource. But I am not sure if I can declare my extension as resource as well. I thought extensions should be extending BaseIdentifiableElement always.

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