Common REST and IDM

IDM implements the Common REST API as described in the previous section, with the exception of the following elements:

IDM provides limited support for the in expression clause. You can use this clause for queries on singleton string properties, not arrays. in query expressions are not supported through the Admin UI.
The PATCH transform action is supported only on the config endpoint. Note that this is an optional action and not implemented everywhere across the ForgeRock Identity Platform.
Common REST supports PATCH operations by list element index, as shown in the example in "Patch Operation: Remove". IDM does not support PATCH by list element index. So, for PATCH ADD operations, you cannot use an ordinal when adding items to a list. You can add an item using the special hyphen index, which designates that the element should be added to the end of the list.
If _fields is left blank (null), the server returns all default values. In IDM, this excludes relationships and virtual fields. To include these fields in the output, add "returnByDefault" : true in the applicable schema.
IDM also implements wild-card (*) handling with the _fields parameter. So, a value of _fields=*_ref will return all relationship fields associated with an object. A value of _fields=*_ref/* will return all the fields within each relationship.
IDM does not implement the ESTIMATE total paged results policy. The totalPagedResults is either the exact total result count (_totalPagedResultsPolicy=EXACT) or result counting is disabled (_totalPagedResultsPolicy=NONE). For more information, see "Page Query Results".