Instance Method

awake(fromSnapshotEvents:)

Provides an opportunity to add code into the life cycle of the managed object when it is being fulfilled from a snapshot.

Declaration

func awake(fromSnapshotEvents flags: NSSnapshotEventType)

Parameters

flags

A bit mask of didChangeValue(forKey:) constants to denote the event or events that led to the method being invoked.

For possible values, see NSSnapshotEventType.

Discussion

You typically use this method to compute derived values or to recreate transient relationships from the receiver’s persistent properties.

If you want to set attribute values and need to avoid emitting key-value observation change notifications, you should use primitive accessor methods (either setPrimitiveValue(_:forKey:) or—better—the appropriate custom primitive accessors). This ensures that the new values are treated as baseline values rather than being recorded as undoable changes for the properties in question.

See Also

Managing Change Events

class var contextShouldIgnoreUnmodeledPropertyChanges: Bool

A Boolean value that indicates whether instances of the class should be marked as having changes if an unmodeled property is changed.

func awakeFromFetch()

Provides an opportunity to add code into the life cycle of the managed object when it is being fulfilled from a fault.

func awakeFromInsert()

Provides an opportunity to add code into the life cycle of the managed object when it is initially created.

func changedValues() -> [String : Any]

Returns a dictionary containing the keys and (old) values of persistent properties that have been changed since the last fetching or saving of the managed object.

func changedValuesForCurrentEvent() -> [String : Any]

Returns a dictionary containing the keys and old values of persistent properties that have changed since the last posting of NSManagedObjectContextObjectsDidChange.

func committedValues(forKeys: [String]?) -> [String : Any]

Returns a dictionary of the last fetched or saved values of the managed object for the properties specified by the given keys.

func prepareForDeletion()

Provides an opportunity to add code into the life cycle of the managed object when it is about to be deleted.

func willSave()

Provides an opportunity to add code into the life cycle of the managed object when it is about to be saved.

func didSave()

Provides an opportunity to add code into the life cycle of the managed object after the managed object’s context completes a save operation.

func willTurnIntoFault()

Provides an opportunity to add code into the life cycle of the managed object before it is converted to a fault.

func didTurnIntoFault()

Provides an opportunity to add code into the life cycle of the managed object when it is turned into a fault.

class func fetchRequest() -> NSFetchRequest<NSFetchRequestResult>

Returns a new fetch request initialized with the entity represented by this subclass.