Instance Method

count(for:)

Returns the number of objects a given fetch request would have returned if it had been passed to executeFetchRequest:error:.

Declaration

func count(for request: NSFetchRequest<NSFetchRequestResult>) throws -> Int

Parameters

request

A fetch request that specifies the search criteria for the fetch.

error

If there is a problem executing the fetch, upon return contains an instance of NSError that describes the problem.

Return Value

The number of objects a given fetch request would have returned if it had been passed to fetch(_:), or NSNotFound if an error occurs.

See Also

Registering and Fetching Objects

func fetch(NSFetchRequest<NSFetchRequestResult>) -> [Any]

Returns an array of objects that meet the criteria specified by a given fetch request.

func registeredObject(for: NSManagedObjectID) -> NSManagedObject?

Returns the object for a specified ID, if the object is registered with the context.

func object(with: NSManagedObjectID) -> NSManagedObject

Returns an object for a specified ID even if the object needs to be fetched.

func existingObject(with: NSManagedObjectID) -> NSManagedObject

Returns the object for the specified ID or nil if the object does not exist.

var registeredObjects: Set<NSManagedObject>

The set of objects registered with the context.

func count<T>(for: NSFetchRequest<T>) -> Int

Returns the number of objects a given fetch request would have returned.

func execute(NSPersistentStoreRequest) -> NSPersistentStoreResult

Passes a request to the persistent store without affecting the contents of the managed object context and returns a persistent store result.

func fetch<T>(NSFetchRequest<T>) -> [T]

Returns an array of objects that meet the criteria specified by a given fetch request.

func refreshAllObjects()

Refreshes all currently registered objects that are associated with this context.

var retainsRegisteredObjects: Bool

A Boolean value that indicates whether the context keeps strong references to all registered managed objects.