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Tadgh 2021-04-01 11:07:46 -04:00
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hapi-fhir-docs/src/main/resources/ca/uhn/hapi/fhir/docs/server_jpa_mdm/mdm_expansion.md
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@ -18,13 +18,16 @@ GET http://example.com:8000/Observation?subject:mdm=Patient/1
This `:mdm` parameter qualifier instructs an interceptor in HAPI fhir to expand the set of resources included in the search by their MDM-matched resources. The two above HTTP requests will return the same result. This `:mdm` parameter qualifier instructs an interceptor in HAPI fhir to expand the set of resources included in the search by their MDM-matched resources. The two above HTTP requests will return the same result.
<div class="helpWarningCalloutBox">
One important caveat is that chaining is currently not supported when using this prefix. One important caveat is that chaining is currently not supported when using this prefix.
</div>
## Enabling MDM Expansion ## Enabling MDM Expansion
On top of needing to instantiate an MDM module, you must enable this feature in the [DaoConfig](/hapi-fhir/apidocs/hapi-fhir-jpaserver-api/ca/uhn/fhir/jpa/api/config/DaoConfig.html) bean, using the [Allow MDM Expansion](/hapi-fhir/apidocs/hapi-fhir-jpaserver-api/ca/uhn/fhir/jpa/api/config/DaoConfig.html#setAllowMdmExpansion(boolean)) property. On top of needing to instantiate an MDM module, you must enable this feature in the [DaoConfig](/hapi-fhir/apidocs/hapi-fhir-jpaserver-api/ca/uhn/fhir/jpa/api/config/DaoConfig.html) bean, using the [Allow MDM Expansion](/hapi-fhir/apidocs/hapi-fhir-jpaserver-api/ca/uhn/fhir/jpa/api/config/DaoConfig.html#setAllowMdmExpansion(boolean)) property.
<div class="helpInfoCalloutBox"> <div class="helpWarningCalloutBox">
It is important to note that enabling this functionality can lead to incorrect data being returned by a request, if your MDM links are incorrect. It is important to note that enabling this functionality can lead to incorrect data being returned by a request, if your MDM links are incorrect. Use with caution.
</div> </div>