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Showing content from https://www.mongodb.com/docs/realm-sdks/swift/latest/Classes/MutableSet.html below:

MutableSet Class Reference

public final class MutableSet<Element> : RLMSwiftCollectionBase, RealmCollectionImpl where Element : RealmCollectionValue

extension MutableSet: ObservableObject, RealmSubscribable

extension MutableSet: Decodable where Element: Decodable

extension MutableSet: Encodable where Element: Encodable

MutableSet is the container type in Realm used to define to-many relationships with distinct values as objects.

Like Swift’s Set, MutableSet 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, MutableSets are reference types, and are only immutable if the Realm that manages them is opened as read-only.

MutableSet’s can be filtered and sorted with the same predicates as Results<Element>.

• Creates a MutableSet that holds Realm model objects of type Element.

  Declaration

  Swift

  public override init()

• Returns an Array containing the results of invoking valueForKey(_:) using key on each of the collection’s objects.

  Declaration

  Swift

  @nonobjc
  public func value(forKey key: String) -> [AnyObject]

• Declaration

  Swift

  public subscript(position: Int) -> Element { get }

• Returns a Boolean value indicating whether the Set contains the given object.

  Declaration

  Swift

  public func contains(_ object: Element) -> Bool

  Parameters object

  The element to find in the MutableSet.

• Returns a Boolean value that indicates whether this set is a subset of the given set.

  Declaration

  Swift

  public func isSubset(of possibleSuperset: MutableSet<Element>) -> Bool

  Parameters object

  Another MutableSet to compare.

• Returns a Boolean value that indicates whether this set intersects with another given set.

  Declaration

  Swift

  public func intersects(_ otherSet: MutableSet<Element>) -> Bool

  Parameters object

  Another MutableSet to compare.

• Inserts an object to the set if not already present.

  Warning

  This method may only be called during a write transaction.

  Declaration

  Swift

  public func insert(_ object: Element)

• Inserts the given sequence of objects into the set if not already present.

  Warning

  Declaration

  Swift

  public func insert<S>(objectsIn objects: S) where Element == S.Element, S : Sequence

• Removes an object in the set if present. The object is not removed from the Realm that manages it.

  Warning

  This method may only be called during a write transaction.

  Declaration

  Swift

  public func remove(_ object: Element)

  Parameters object

  The object to remove.

• Removes all objects from the set. The objects are not removed from the Realm that manages them.

  Warning

  Declaration

  Swift

  public func removeAll()

• Mutates the set in place with the elements that are common to both this set and the given sequence.

  Warning

  This method may only be called during a write transaction.

  Declaration

  Swift

  public func formIntersection(_ other: MutableSet<Element>)

• Mutates the set in place and removes the elements of the given set from this set.

  Warning

  This method may only be called during a write transaction.

  Declaration

  Swift

  public func subtract(_ other: MutableSet<Element>)

• Inserts the elements of the given sequence into the set.

  Warning

  This method may only be called during a write transaction.

  Declaration

  Swift

  public func formUnion(_ other: MutableSet<Element>)

• Returns a human-readable description of the objects contained in the MutableSet.

  Declaration

  Swift

  public override var description: String { get }

• A publisher that emits Void each time the collection changes.

  Despite the name, this actually emits after the collection has changed.

  Declaration

  Swift

  public var objectWillChange: RealmPublishers.WillChange<MutableSet> { get }

• Declaration

  Swift

  public convenience init(from decoder: Decoder) throws

• MutableSetElementMapper transforms the actual MutableSet of Objects or MutableSet of EmbeddedObjects in to ProjectedCollection.

  For example:

   class Person: Object {
       @Persisted var dogs: MutableSet<Dog>
   }
   class PersonProjection: Projection<Person> {
       @Projected(\Person.dogs.projectTo.name) var dogNames: ProjectedCollection<String>
   }
  

  In this code the Person‘s dogs set will be prijected to the projected set of dogs names via projectTo Note: This is not the actual set data type therefore projected elements can contain duplicates.

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