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On this page
  • Include
  • Syntax
  • Revinclude
  • Syntax
  • Chained (rev)includes
  • (rev)include and _elements
  • :logical modifier
  • Example
  • Authorize Inline Requests Mode
  • AccessPolicy Examples with Authorize Inline Requests Mode
  • AccessPolicy Examples without Authorize Inline Requests Mode
  • See also:

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  1. API
  2. REST API
  3. FHIR Search

Include and Revinclude

PreviousSearchParameterNextChaining

Last updated 22 days ago

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The _include and _revinclude search parameters allow a search to return additional resources related to the matching resources.

Include

The _include parameter returns additional resources that are referenced by the matching resources. For example, when searching for MedicationRequest resources, you can include the referenced Practitioner resources:

GET /fhir/MedicationRequest?patient=123&_include=MedicationRequest:practitioner

Syntax

 _include(:reverse|:iterate|:logical)=source-type:search-param:(:target-type)

Here search-param is a name of the search parameter with the type reference defined for source-type.

This query can be interpreted in the following manner. For the source-type resources in the result include all target-type resources, which are referenced by the search-param.

target-type is optional for not chained includes and means all referenced resource types:

GET /fhir/Encounter?_include=Encounter:subject 
=> GET /fhir/Encounter?_include=Encounter:subject:*

For more explicit interpretation and performance reasons, the client must provide target-type for chained includes!

Revinclude

The _revinclude parameter returns additional resources that reference the matching resources. It performs the reverse of _include. Instead of following references forward, it follows them backward to find resources referencing the matches.

For example, to find all Provenance resources that reference a specific MedicationRequest:

GET /fhir/MedicationRequest?_id=123&_revinclude=Provenance

Syntax

_revinclude(:reverse|:iterate|:logical)=source-type:search-param(:target-type)

Interpretation: include all source-type resources, which refer target-type resources by search-param in the result set.

Chained (rev)includes

The :iterate modifier can be used with both _include and _revinclude to recursively follow references. This allows retrieving resources that are multiple hops away in the reference chain. Without :iterate modifier, _include and _revinclude are only used for the main resource type (you can not choose different source-type without :iterate).

Example:

 GET /fhir/Observation?code=http://snomed.info/sct|3738000&_include=Observation:patient&_include:iterate=Patient:link

would match any observations with the SNOMED code 3738000 (Viral hepatitis (disorder)). The results would include resources from following the search reference Observation.patient, which are Patient resources linked via Observation.subject. Additionally, the server would iterate through the included patient records and follow the Patient.link references, including linked Patient or RelatedPerson resources.

Also, you can use _include:iterate to recursively follow references. Observation.has-member is a reference to a group of possible observations. Suppose, org-1 is a part of org-2, org-2 is a part of org-3. This request will return org-1, org-2 and org-3:

GET /fhir/Organization?_id=org-1&_revinclude:iterate=Organization:partof

(rev)include and _elements

Aidbox enhances FHIR _elements parameter to support fields from included resources.

Example:

GET /Encounter?_include=patient&_elements=id,status,Patient.name,Patient.birthDate

:logical modifier

If you provide :logical modifier, Aidbox will include logically referenced resources as well. Logical reference means reference with an type field set to resource-type and identifier field set to one of the identifiers of the referenced resource.

Example

If Encounter references Patient logically using Reference.identifier like this:

PUT /fhir/Encounter

resourceType: Encounter
id: enc-123
subject: 
  type: Patient
  identifier: {system: 'ssn', value: '78787878'}
class: {code: 'IMP', 
  system: 'http://terminology.hl7.org/CodeSystem/v3-ActCode', 
  display: 'inpatient encounter'}
status: finished

You can include Patient resources by providing :logical modifier:

GET /fhir/Encounter?_include:logical=Encounter:patient

Or include Encounter resources to Patient resources by providing :logical modifier:

GET /fhir/Patient?_revinclude:logical=Encounter:patient:Patient

Authorize Inline Requests Mode

Aidbox provides access control for inline requests (_include & _revinclude) to ensure users can only retrieve resources they are authorized to view. When a search request contains an inline query, Aidbox verifies access by performing an authorization check against a search query for the included resource. If the requesting user lacks the necessary access rights to the included resource, the entire request is denied with a 403 status.

To enable access control for inline requests, set the following environment variable:

BOX_SEARCH_AUTHORIZE_INLINE_REQUESTS=true

AccessPolicy Examples with Authorize Inline Requests Mode

Below are examples of AccessPolicy configurations that allow requests such as:

GET /fhir/Patient?_include=Patient:organization

With this AccessPolicy, the user can use any _include parameters that result in Organization resources being included. However, the query will be rejected if it attempts to include any other resource types.

  operation:
    id: "FhirSearch"
  params:
    resource/type: "Patient"
  user:
    id: "my-user-1"
    resourceType: "User"

  operation:
    id: "FhirSearch"
  params:
    resource/type: "Organization"
  user:
    id: "my-user-1"
    resourceType: "User"

AccessPolicy Examples without Authorize Inline Requests Mode

If this mode is not enabled, you must define the specific _include or _revinclude parameters allowed in an AccessPolicy, as shown in the example below. However, this method can be inflexible, and we recommend using Authorize Inline Requests Mode in most cases.

  operation:
    id: "FhirSearch"
  params:
    resource/type: "Patient"
    _include: "Patient:organization"
  user:
    id: "my-user-1"
    resourceType: "User"

See also:

Conformant Include
Search Settings Reference