Dose as SimpleQuantity

[rdbossjr]

Hello, We are upgrading from a 1.* version of Hl7.Fhir.STU3. We are getting a compile error when trying to convert a MedicationRequest dose to a SimpleQuantity. It does not seem like SimpleQuantity exists and the Type of Dose is now DataType. Here is the code before:

            if (!(dosageInstruction.Dose is Quantity quantity))
            {
                quantity = dosageInstruction.Dose as SimpleQuantity;
            }
            var unit = quantity?.Unit;

Thanks in advance for any help given.
David

[marcovisserFurore]

Hi David,

SimpleQuantity is actually not a datatype but a profile on Quantity. This is also stated in the FHIR standard: https://www.hl7.org/fhir/STU3/datatypes.html#SimpleQuantity.

In Firely SDK version <= 1.9 this was not correctly implemented. For version 2.0 and higher this has been revised. So the datatype of dosageInstruction.Dose is Quantity and has profile SimpleQuantity. Which means that the datatype has been constraint. In this case a comparator is not allowed on Quantity.

Profiles are not generated as Poco, that is why you won't find SimpleQuantity anymore in the code.