Supported Types - Kotlin SDK
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Realm Database supports the following field data types:
StringByteCharShortIntLongBooleanDoubleFloatObjectIdRealmInstantAny
RealmObjectsubclassRealmListRealmUUID
Realm Database stores all non-decimal numeric types as Long values.
Similarly, Realm Database stores all decimal numeric types as Double
values.
Realm Database does not support fields with modifiers final and
volatile, though you can use fields with those modifiers if you
ignore them. If you choose to provide custom
constructors, you must declare a public constructor with no arguments.
Updating Strings and Byte Arrays
Since Realm Database operates on fields as a whole, it's not possible to directly update individual elements of strings or byte arrays. Instead, you'll need to read the whole field, make your modification to individual elements, and then write the entire field back again in a transaction block.