Smile CDR v2024.08.PRE
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6.12.1Searching For Data


This section contains information about methods for searching for data in the CDR.

6.12.2FHIR Search Extensions


In addition to implementing most of the FHIR Search specification, Smile CDR implements the following extensions:`_source`

An additional search parameter called _source can be used to search for resources based on information about the system or request that created the resource. See Storing Source Information.`%now`

Date searches can be performed relative to "now" using the %now parameter value. For example, to search for Procedures with a date later than now, you can search for /Procedure?date=ge%now.

Note the '%' would need to be URL escaped so the actual URL will be /Procedure?date=ge%25now

The way this works is Smile substitutes %now with the current date and time in the standard FHIR format yyyy-MM-ddTHH:mm:ss before submitting it to the FHIR Storage module.`%today`

Similarly date searches can be performed relative to 'today' using the '%today' parameter value. '%today' works the same as '%now' except that it searches as a 'date' type as opposed to a 'dateTime' type.

6.12.3Unsupported Search Parameters


Smile CDR does not currently support the _containedType FHIR Search parameter, or the _contained=both directive. See Index Contained for information on indexing contained resources.

6.12.4Limitations modifier restriction for contained resources

Smile CDR searches may not correctly process :[type] modifiers if the resource indicated by the modified search parameter is a contained resource. For example, consider the following search. http://localhost:8000/Observation?

Suppose Observation/A has a reference to Device/B, which in turn has a reference to Organization/C, and Organization/C has the name "HealthOrg". In this case, Observation/A will not be included in the search result, because the subject search parameter is restricted to Patient resources. However, if Observation/D has a reference to #contained-device, which also refers to Organization/C, then Observation/D will be included in the search result, because we can not apply the type restriction to contained resources. types for Component of Composite SearchParameters

Composite and Combo SearchParameters are composed of other SearchParameters which are listed under the component element of the SearchParameter. Smile Digital Health support subsets of SearchParameterTypes for composed SearchParameters which will differ based on the containing SearchParameter definition (see sp_unique extension) and whether Indexing of Search Parameters is enabled.

The following table lists supported Types for contained SearchParameters based on the containing composed SearchParameter:

Containing composed SP / Contained SP TypeStringTokenDateQuantityUriNumberReference
Combo Unique
Combo Non-Unique
Composite with full test indexing
Composite without full test indexing