@KhumboLihonga I can replicate your issue using the questionnaire I defined below, which works with resources fetched from the public https://hapi.fhir.org/baseR4/ site.

Will continue to debug

{
  "resourceType": "Questionnaire",
  "id": "test-questionnaire",
  "language": "en",
  "title": "Test Questionnaire",
  "status": "active",
  "publisher": "mcore",
  "contact": [
    {
      "name": "http:https://www.d-tree.org"
    }
  ],
  "item": [
    {
      "extension": [
        {
          "url": "http:https://hl7.org/fhir/StructureDefinition/questionnaire-itemControl",
          "valueCodeableConcept": {
            "coding": [
              {
                "system": "http:https://hl7.org/fhir/questionnaire-item-control",
                "code": "drop-down",
                "display": "Drop down"
              }
            ],
            "text": "Drop down"
          }
        },
        {
          "url": "http:https://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-initialExpression",
          "valueExpression": {
            "language": "text/fhirpath",
            "expression": "Patient.id"
          }
        },
        {
          "url": "http:https://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-answerExpression",
          "valueExpression": {
            "expression": "Patient?address-city=NAIROBI",
            "language": "application/x-fhir-query"
          }
        },
        {
          "url": "http:https://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-choiceColumn",
          "extension": [
            {
              "url": "path",
              "valueString": "display"
            },
            {
              "url": "label",
              "valueString": "name"
            },
            {
              "url": "forDisplay",
              "valueBoolean": true
            }
          ]
        }
      ],
      "linkId": "district",
      "text": "District",
      "type": "reference",
      "required": true
    }
  ]
}

@KhumboLihonga I created PR #1831 to propose fixing. Please check out and lmk if you have any thoughts

Hey @omarismail94, my colleague tested your PR and was unable to verify that the issue was fixed. This is the comment he left. Is there any update on this?

Hey @KhumboLihonga and @sevenreup , please see the attached video of the fix working:

Where is the app crashing for you, and what are the logs that you are getting?

I also had to implement the DataCaptureConfig.Provider interface in the FhirApplication class to provide an xFhirQueryResolver:

https://github.com/google/android-fhir/pull/1831/files#diff-dc8902f9b4a0cb8dab12c5cdb57cfefbcf29b4482c5d2e28e60c6e51ac932389

@omarismail94 the initial expression is working when I use the example questionnaire you gave here, it only shows the resource reference as a label.
But when I try to change the label to something else for example the Patients name, it does not work.
The questionnaire I am using is the one below.

{
  "resourceType": "Questionnaire",
  "id": "test-questionnaire",
  "language": "en",
  "title": "Test Questionnaire",
  "status": "active",
  "publisher": "mcore",
  "contact": [
    {
      "name": "http:https://www.d-tree.org"
    }
  ],
  "item": [
    {
      "extension": [
        {
          "url": "http:https://hl7.org/fhir/StructureDefinition/questionnaire-itemControl",
          "valueCodeableConcept": {
            "coding": [
              {
                "system": "http:https://hl7.org/fhir/questionnaire-item-control",
                "code": "drop-down",
                "display": "Drop down"
              }
            ],
            "text": "Drop down"
          }
        },
        {
          "url": "http:https://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-initialExpression",
          "valueExpression": {
            "language": "text/fhirpath",
            "expression": "Patient.id"
          }
        },
        {
          "url": "http:https://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-answerExpression",
          "valueExpression": {
            "expression": "Patient?address-city=NAIROBI",
            "language": "application/x-fhir-query"
          }
        },
        {
          "url": "http:https://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-choiceColumn",
          "extension": [
            {
              "url": "path",
              "valueString": "name.given"
            },
            {
              "url": "label",
              "valueString": "text"
            },
            {
              "url": "forDisplay",
              "valueBoolean": true
            }
          ]
        }
      ],
      "linkId": "district",
      "text": "District",
      "type": "reference",
      "required": true
    }
  ]
}

@sevenreup hmm, is name.given a valid fhir path? can you try name.first().given? That should give you a list of all given names in the choices. We add first() because the name field is repeated

It is a valid path. Even when I use first() I am still getting the same problem

When I do name.first().given, this is what I get:

Is what you want that the Patient Id appears initially (not the given name), and then when the dropdown is selected, the given names are shown?

We want what we have defined as the label to appear initially and in the selection ( in this case, the patient's name). Because what is happening now is the initial selection is not working when you change the path.

If I understand correctly, you want what is defined in the label field to appear in the selection, just like in the example here:
https://build.fhir.org/ig/HL7/sdc/examples.html#using-choicecolumn

I think that is a different issue than what this Issue was opened for. Would you agree? My understanding of this opened issue is to set the initial value using the initial expression extension

@omarismail94 I feel there are two issues here:

1. If the path attribute is changed to name.first().given, the dropdown options are indeed updated to display as intended BUT the initial expression does not set the initial value (regardless of how it is meant to be presented)
2. We should be able to define how the selected item should be presented using the label attribute

I believe point 1 is still a part of this PR while point 2 would be a separate PR. What do you think?

@omarismail94 Just following up on this issue. What do you think about my comment above?

@omarismail94 following up on this once again. Let me know your thoughts on the comment above so we can decide how to best proceed.