Classes

The following classes are available globally.

  • A 128-bit IEEE 754-2008 decimal floating point number.

    This type is similar to Swift’s built-in Decimal type, but allocates bits differently, resulting in a different representable range. (NS)Decimal stores a significand of up to 38 digits long and an exponent from -128 to 127, while this type stores up to 34 digits of significand and an exponent from -6143 to 6144.

    See more

    Declaration

    Swift

    @objc(RealmSwiftDecimal128)
    public final class Decimal128 : RLMDecimal128, Decodable
    extension Decimal128: BSON
    extension Decimal128: Encodable
    extension Decimal128: ExpressibleByIntegerLiteral
    extension Decimal128: ExpressibleByFloatLiteral
    extension Decimal128: ExpressibleByStringLiteral
    extension Decimal128: Comparable
    extension Decimal128: RealmCollectionValue
    extension Decimal128: MinMaxType
    extension Decimal128: AddableType
  • A 12-byte (probably) unique object identifier.

    ObjectIds are similar to a GUID or a UUID, and can be used to uniquely identify objects without a centralized ID generator. An ObjectID consists of:

    1. A 4 byte timestamp measuring the creation time of the ObjectId in seconds since the Unix epoch.
    2. A 5 byte random value
    3. A 3 byte counter, initialized to a random value.

    ObjectIds are intended to be fast to generate. Sorting by an ObjectId field will typically result in the objects being sorted in creation order.

    See more

    Declaration

    Swift

    @objc(RealmSwiftObjectId)
    public final class ObjectId : RLMObjectId, Decodable
    extension ObjectId: BSON
    extension ObjectId: Encodable
    extension ObjectId: Comparable
    extension ObjectId: RealmCollectionValue
  • List is the container type in Realm used to define to-many relationships.

    Like Swift’s Array, List is a generic type that is parameterized on the type it stores. This can be either an Object subclass or one of the following types: Bool, Int, Int8, Int16, Int32, Int64, Float, Double, String, Data, Date, Decimal128, and ObjectId (and their optional versions)

    Unlike Swift’s native collections, Lists are reference types, and are only immutable if the Realm that manages them is opened as read-only.

    Lists can be filtered and sorted with the same predicates as Results<Element>.

    Properties of List type defined on Object subclasses must be declared as let and cannot be dynamic.

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    Declaration

    Swift

    public final class List<Element> : ListBase where Element : RealmCollectionValue
    extension List: ObservableObject, RealmSubscribable
    extension List: RealmCollection
    extension List: MutableCollection
    extension List: Decodable where Element: Decodable
    extension List: Encodable where Element: Encodable
  • A RealmOptional instance represents an optional value for types that can’t be directly declared as @objc in Swift, such as Int, Float, Double, and Bool.

    To change the underlying value stored by a RealmOptional instance, mutate the instance’s value property.

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    Declaration

    Swift

    public final class RealmOptional<Value> : RLMOptionalBase where Value : RealmOptionalType
    extension RealmOptional: Equatable where Value: Equatable
    extension RealmOptional: Codable where Value: Codable