Alternative to JUTE $map directive proposal

[ir4y]

Use FHIRPath as a key for array:

{
    "resourceType": "Bundle",
    "type": "transaction",
    "entry": [{
        "request": {
            "url": "{{ '/Patient/' + QuestionnaireResponse.repeat(item).where(linkId='patientId').answer.valueString }}",
            "method": "PATCH"
        },
        "resource": {
            "telecom": {
                "{{ QuestionnaireResponse.repeat(item).where(linkId='phone-group') }}": { //<-<-<-<-<-<-<-<-
                    "system": "phone",
                    "use": "{{ item.where(linkId='phone-type').answer.valueString }}",
                    "value": "{{ item.where(linkId='phone-number').answer.valueString }}"
                }
            }
        }
    }]
}

https://github.com/beda-software/FHIRPathMappingLanguage/blob/main/examples/repeatable/fhirpathmap.json#L11

[ruscoder]

How to deal with mapping values from multiple QR fields into one array attribute, let's say I want to populatetelecom field with multiple emails (linkId=email-group) and multiple phone number (linkId=phone-group)?

I can suggest, something like:

{
    "resourceType": "Bundle",
    "type": "transaction",
    "entry": [{
        "request": {
            "url": "{{ '/Patient/' + QuestionnaireResponse.repeat(item).where(linkId='patientId').answer.valueString }}",
            "method": "PATCH"
        },
        "resource": {
            "telecom": [
                {
                    "{{ QuestionnaireResponse.repeat(item).where(linkId='phone-group') }}": { //<-<-<-<-<-<-<-<-
                        "system": "phone",
                        "use": "{{ item.where(linkId='phone-type').answer.valueString }}",
                        "value": "{{ item.where(linkId='phone-number').answer.valueString }}"
                    }
                },
                {
                    "{{ QuestionnaireResponse.repeat(item).where(linkId='email-group') }}": { //<-<-<-<-<-<-<-<-
                        "system": "email",
                        "use": "{{ item.where(linkId='email-type').answer.valueString }}",
                        "value": "{{ item.where(linkId='email').answer.valueString }}"
                    }
                },
            ]
        }
    }]
}

For one hardcoded telecom:

{
    "resourceType": "Bundle",
    "type": "transaction",
    "entry": [{
        "request": {
            "url": "{{ '/Patient/' + QuestionnaireResponse.repeat(item).where(linkId='patientId').answer.valueString }}",
            "method": "PATCH"
        },
        "resource": {
            "telecom": [
                {
                    "system": "phone",
                    "use": "{{ QuestionnaireResponse.repeat(item).where(linkId='phone-group').where(linkId='phone-type').answer.valueString }}",
                    "value": "{{ QuestionnaireResponse.repeat(item).where(linkId='phone-group').where(linkId='phone-number').answer.valueString }}"
                },
            ]
        }
    }]
}

So, if the key contains expression, it should be mapped to array of objects.

[ir4y]

Another possible approach that leverages https://shopify.github.io/liquid/tags/iteration/#for
An array element could be a JSON object with a single key. The key is a liquid tag that describes the iteration logic.
All resulting elements will be added to the parenting array:

{
    "resourceType": "Bundle",
    "type": "transaction",
    "entry": [{
        "request": {
            "url": "{{ '/Patient/' + QuestionnaireResponse.repeat(item).where(linkId='patientId').answer.valueString }}",
            "method": "PATCH"
        },
        "resource": {
            "telecom": [{
                "{% for item in QuestionnaireResponse.repeat(item).where(linkId='phone-group') %}": { 
                    "system": "phone",
                    "use": "{{ %item.where(linkId='phone-type').answer.valueString }}",
                    "value": "{{ %item.where(linkId='phone-number').answer.valueString }}"
                }
            },
           {
                "{% for item in QuestionnaireResponse.repeat(item).where(linkId='email-group') %}": { 
                    "system": "email",
                    "use": "{{ %item.where(linkId='email-type').answer.valueString }}",
                    "value": "{{ %item.where(linkId='email-number').answer.valueString }}"
                }
            },
           {
                "system": "other",
                "use": "icq",
                "value": "123321231"
           }]
        }
    }]
}

[ir4y]

As an alternative approach we can use an extension, please check #4 for more details.

[ruscoder]

I've added an additional explicit iteration logic using the for block, the tests are available here

FHIRPathMappingLanguage/ts/server/src/utils/extract.spec.ts

Line 333 in 35441b4

describe('For block', () => {