Class: NSManagedObjectID
Overview
An NSManagedObjectID object is a compact, universal identifier for a managed object. This forms the basis for uniquing in the Core Data Framework. A managed object ID uniquely identifies the same managed object both between managed object contexts in a single application, and in multiple applications (as in distributed systems). Identifiers contain the information needed to exactly describe an object in a persistent store (like the primary key in the database), although the detailed information is not exposed. The framework completely encapsulates the “external” information and presents a clean object oriented interface.
Instance Method Summary (collapse)
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- entity
Returns the entity description associated with the receiver.
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- isTemporaryID
Returns a Boolean value that indicates whether the receiver is temporary.
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- persistentStore
Returns the persistent store that contains the object whose ID is the receiver.
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- URIRepresentation
Returns a URI that provides an archiveable reference to the object which the receiver represents.
Methods inherited from NSObject
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Constructor Details
This class inherits a constructor from NSObject
Dynamic Method Handling
This class handles dynamic methods through the method_missing method in the class NSObject
Instance Method Details
- (NSEntityDescription) entity
Returns the entity description associated with the receiver.
- (Boolean) isTemporaryID
Returns a Boolean value that indicates whether the receiver is temporary. Most object IDs return NO. New objects inserted into a managed object context are assigned a temporary ID which is replaced with a permanent one once the object gets saved to a persistent store.
- (NSPersistentStore) persistentStore
Returns the persistent store that contains the object whose ID is the receiver.
- (NSURL) URIRepresentation
Returns a URI that provides an archiveable reference to the object which the receiver represents.
If the corresponding managed object has not yet been saved, the object ID (and hence URI) is a temporary value that will change when the corresponding managed object is saved.