Docs Home → Develop Applications → Atlas Device SDKs
RealmAny - Java SDK
On this page
New in version 10.6.0.
You can use the RealmAny data type to create
Realm object fields that can contain any of several
underlying types. You can store multiple RealmAny instances in
RealmList, RealmDictionary, or RealmSet fields. To change
the value of a RealmAny field, assign a new RealmAny instance
with a different underlying value. In Atlas App Services backend
object schemas, the RealmAny
data type is called mixed. RealmAny fields are indexable, but
cannot be used as primary keys.
Note
RealmAny Type Compatiblility
RealmAny objects can refer to any
supported field type
except:
RealmAnyRealmListRealmSetRealmDictionary
Usage
To create a RealmAny instance, use the
RealmAny.valueOf() method
to assign an initial value or RealmAny.nullValue() to assign no
value. RealmAny instances are immutable just like String or
Integer instances; if you want to assign a new value to a
RealmAny field, you must create a new RealmAny instance.
Warning
Two Possible Null RealmAny Values
RealmAny instances are always nullable. Additionally, instances can contain a value
of type RealmAny.Type.NULL.
Queries
You can query a RealmAny field just like any other data type.
Operators that only work with certain types, such as string
operators and arithmetic operators, ignore
values that do not contain that type. Negating such operators matches
values that do not contain the type. Type queries match the underlying
type, rather than RealmAny. Arithmetic operators convert numeric
values implicitly to compare across types.
Notifications
To subscribe to changes to a RealmAny field, use the
RealmObject.addChangeListener
method of the enclosing object. You can use the
ObjectChangeSet
parameter to determine if the RealmAny field changed.