How to search birthData in fhir using _content?

Question

When I search with only birthData in fhir I am getting results.

For example: http://localhost:8080/hapi-fhir-jpaserver/fhir/Patient?_pretty=true&birthdate=2020-03-16 will return patient who has birthdate as 2020-03-16.

When I am searching with _content I am not getting any results. Something like this:

http://localhost:8080/hapi-fhir-jpaserver/fhir/Patient?_content=2019-09-05

score 2 · Accepted Answer · answered Mar 18 '20 at 21:58

2

_content is for searching text content.

If you want to search for dates you need to use a date search parameter. E.g.:

http://localhost:8080/hapi-fhir-jpaserver/fhir/Patient?birthDate=2019-09-05

answered Mar 18 '20 at 21:58

James Agnew

701
4
3

I can search with birthDate, but can we write our own indexing on _content. Does the hapi fhir provides that type of functionality? – Srinivas Mar 19 '20 at 05:03
Not at this time, no. – James Agnew Mar 20 '20 at 09:32

score 2 · Answer 2 · answered Mar 23 '20 at 05:13

This can be achieved using Search Parameters.

Search parameters are essentially named paths within resources that are indexed by the system so that they can be used to find resources that match a given criteria.

Using Search parameter

we can add additional search parameters that will index fields that do not have a standard search parameter defined.
we can add additional search parameters that will index extensions used by your clients.
we can disable search parameters

Example:

Lets say I have a PractitionerRole

    "resourceType": "PractitionerRole",
    "id": "6639",
    "meta": {
      "versionId": "1",
      "lastUpdated": "2020-03-19T13:26:34.748+05:30",
      "source": "#aYyeIlv9Yutudiwy"
    },
    "text": {
      "status": "generated",
      "div": "<div xmlns=\"<http://www.w3.org/1999/xhtml\">foo</div>">
    },
    "active": true,
    "practitioner": {
      "reference": "Practitioner/6607"
    },
    "organization": {
      "reference": "Organization/6528"
    },
    "specialty": [
      {
        "coding": [
          {
            "system": "<http://snomed.info/sct",>
            "code": "42343242",
            "display": "Clinical immunology"
          }
        ]
      }
    ]
}

PractitionerRole has thier own search parameters. Apart from those search parameters we wanted to have a search parameter which will filter all practitioner roles based on practitioner.reference. We can achieve this using Search parameters. All we need to do is creating a new search parameter just like below.

{
"resourceType": "SearchParameter",
"title": "Practitioner Referecene",
"base": [ "PractitionerRole" ],
"status": "active",
"code": "practitioner_reference",
"type": "token",
"expression": "PractitionerRole.practitioner.reference",
"xpathUsage": "normal"
}

Here what fhir tells is when user wanted to filter with practitioner_reference then look for PractitionerRole.practitioner.reference.

This looks something like this: http://localhost:8080/hapi-fhir-jpaserver/fhir/PractitionerRole?practitioner_reference=Practitioner/6607

We can also extend this to search with multiple parameters. We can create a search parameter with or condition so that it can search with multi parameters.

  "resourceType": "SearchParameter",
  "title": "Patient Multi Search",
  "base": [ "Patient" ],
  "status": "active",
  "code": "pcontent",
  "type": "token",
  "expression": "Patient.managingOrganization.reference|Patient.birthDate|Patient.address[0].city",
  "xpathUsage": "normal"
}

Above SearchParameter will search withPatient.managingOrganization.reference or Patient.birthDate or Patient.address[0].city.

The query looks like this:

Search With City → http://localhost:8080/hapi-fhir-jpaserver/fhir/Patient?pcontent=Bruenmouth

Search With Birth Date → http://localhost:8080/hapi-fhir-jpaserver/fhir/Patient?pcontent=2019-04-06

How to search birthData in fhir using _content?

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