RLMRealm

Obtains an instance of the default Realm.

The default Realm is used by the RLMObject class methods which do not take an RLMRealm parameter, but is otherwise not special. The default Realm is persisted as default.realm under the Documents directory of your Application on iOS, in your application’s Application Support directory on macOS, and in the Cache directory on tvOS.

The default Realm is created using the default RLMRealmConfiguration, which can be changed via +[RLMRealmConfiguration setDefaultConfiguration:].

Obtains an instance of the default Realm bound to the given queue.

Rather than being confined to the thread they are opened on, queue-bound RLMRealms are confined to the given queue. They can be accessed from any thread as long as it is from within a block dispatch to the queue, and notifications will be delivered to the queue instead of a thread’s run loop.

Realms can only be confined to a serial queue. Queue-confined RLMRealm instances can be obtained when not on that queue, but attempting to do anything with that instance without first dispatching to the queue will throw an incorrect thread exception.

The default Realm is created using the default RLMRealmConfiguration, which can be changed via +[RLMRealmConfiguration setDefaultConfiguration:].

Obtains an RLMRealm instance with the given configuration.

Obtains an RLMRealm instance with the given configuration bound to the given queue.

Rather than being confined to the thread they are opened on, queue-bound RLMRealms are confined to the given queue. They can be accessed from any thread as long as it is from within a block dispatch to the queue, and notifications will be delivered to the queue instead of a thread’s run loop.

Realms can only be confined to a serial queue. Queue-confined RLMRealm instances can be obtained when not on that queue, but attempting to do anything with that instance without first dispatching to the queue will throw an incorrect thread exception.

Obtains an RLMRealm instance persisted at a specified file URL.

Asynchronously open a Realm and deliver it to a block on the given queue.

Opening a Realm asynchronously will perform all work needed to get the Realm to a usable state (such as running potentially time-consuming migrations) on a background thread before dispatching to the given queue. In addition, synchronized Realms wait for all remote content available at the time the operation began to be downloaded and available locally.

The Realm passed to the callback function is confined to the callback queue as if -[RLMRealm realmWithConfiguration:queue:error] was used.

The RLMSchema used by the Realm.

Indicates if the Realm is currently engaged in a write transaction.

The RLMRealmConfiguration object that was used to create this RLMRealm instance.

Indicates if this Realm contains any objects.

Indicates if this Realm is frozen.

Returns a frozen (immutable) snapshot of this Realm.

A frozen Realm is an immutable snapshot view of a particular version of a Realm’s data. Unlike normal RLMRealm instances, it does not live-update to reflect writes made to the Realm, and can be accessed from any thread. Writing to a frozen Realm is not allowed, and attempting to begin a write transaction will throw an exception.

All objects and collections read from a frozen Realm will also be frozen.

Returns a live reference of this Realm.

All objects and collections read from the returned Realm will no longer be frozen. This method will return self if it is not already frozen.

Writes a compacted and optionally encrypted copy of the Realm to the given local URL.

The destination file cannot already exist.

Note that if this method is called from within a write transaction, the current data is written, not the data from the point when the previous write transaction was committed.

Checks if the Realm file for the given configuration exists locally on disk.

For non-synchronized, non-in-memory Realms, this is equivalent to -[NSFileManager.defaultManager fileExistsAtPath:config.path]. For synchronized Realms, it takes care of computing the actual path on disk based on the server, virtual path, and user as is done when opening the Realm.

Deletes the local Realm file and associated temporary files for the given configuration.

This deletes the “.realm”, “.note” and “.management” files which would be created by opening the Realm with the given configuration. It does not delete the “.lock” file (which contains no persisted data and is recreated from scratch every time the Realm file is opened).

The Realm must not be currently open on any thread or in another process. If it is, this will return NO and report the error RLMErrorAlreadyOpen. Attempting to open the Realm on another thread while the deletion is happening will block (and then create a new Realm and open that afterwards).

If the Realm already does not exist this will return NO and report the error NSFileNoSuchFileError;

Adds a notification handler for changes in this Realm, and returns a notification token.

Notification handlers are called after each write transaction is committed, either on the current thread or other threads.

Handler blocks are called on the same thread that they were added on, and may only be added on threads which are currently within a run loop. Unless you are specifically creating and running a run loop on a background thread, this will normally only be the main thread.

The block has the following definition:

typedef void(^RLMNotificationBlock)(RLMNotification notification, RLMRealm *realm);

It receives the following parameters:

• NSString *notification: The name of the incoming notification. See RLMRealmNotification for information on what notifications are sent.

• RLMRealm *realm: The Realm for which this notification occurred.

Begins a write transaction on the Realm.

Only one write transaction can be open at a time for each Realm file. Write transactions cannot be nested, and trying to begin a write transaction on a Realm which is already in a write transaction will throw an exception. Calls to beginWriteTransaction from RLMRealm instances for the same Realm file in other threads or other processes will block until the current write transaction completes or is cancelled.

Before beginning the write transaction, beginWriteTransaction updates the RLMRealm instance to the latest Realm version, as if refresh had been called, and generates notifications if applicable. This has no effect if the Realm was already up to date.

It is rarely a good idea to have write transactions span multiple cycles of the run loop, but if you do wish to do so you will need to ensure that the Realm participating in the write transaction is kept alive until the write transaction is committed.

Commits all write operations in the current write transaction, and ends the transaction.

After saving the changes, all notification blocks registered on this specific RLMRealm instance are invoked synchronously. Notification blocks registered on other threads or on collections are invoked asynchronously. If you do not want to receive a specific notification for this write tranaction, see commitWriteTransactionWithoutNotifying:error:.

This method can fail if there is insufficient disk space available to save the writes made, or due to unexpected i/o errors. This version of the method throws an exception when errors occur. Use the version with a NSError out parameter instead if you wish to handle errors.

Commits all write operations in the current write transaction, and ends the transaction.

After saving the changes, all notification blocks registered on this specific RLMRealm instance are invoked synchronously. Notification blocks registered on other threads or on collections are invoked asynchronously. If you do not want to receive a specific notification for this write tranaction, see commitWriteTransactionWithoutNotifying:error:.

This method can fail if there is insufficient disk space available to save the writes made, or due to unexpected i/o errors.

Commits all write operations in the current write transaction, without notifying specific notification blocks of the changes.

After saving the changes, all notification blocks registered on this specific RLMRealm instance are invoked synchronously. Notification blocks registered on other threads or on collections are scheduled to be invoked asynchronously.

You can skip notifiying specific notification blocks about the changes made in this write transaction by passing in their associated notification tokens. This is primarily useful when the write transaction is saving changes already made in the UI and you do not want to have the notification block attempt to re-apply the same changes.

The tokens passed to this method must be for notifications for this specific RLMRealm instance. Notifications for different threads cannot be skipped using this method.

This method can fail if there is insufficient disk space available to save the writes made, or due to unexpected i/o errors.

Reverts all writes made during the current write transaction and ends the transaction.

This rolls back all objects in the Realm to the state they were in at the beginning of the write transaction, and then ends the transaction.

This restores the data for deleted objects, but does not revive invalidated object instances. Any RLMObjects which were added to the Realm will be invalidated rather than becoming unmanaged. Given the following code:

ObjectType *oldObject = [[ObjectType objectsWhere:@"..."] firstObject];
ObjectType *newObject = [[ObjectType alloc] init];

[realm beginWriteTransaction];
[realm addObject:newObject];
[realm deleteObject:oldObject];
[realm cancelWriteTransaction];

Both oldObject and newObject will return YES for isInvalidated, but re-running the query which provided oldObject will once again return the valid object.

KVO observers on any objects which were modified during the transaction will be notified about the change back to their initial values, but no other notifcations are produced by a cancelled write transaction.

Performs actions contained within the given block inside a write transaction.

Performs actions contained within the given block inside a write transaction.

Performs actions contained within the given block inside a write transaction.

Performs actions contained within the given block inside a write transaction.

Write transactions cannot be nested, and trying to execute a write transaction on a Realm which is already participating in a write transaction will throw an exception. Calls to transactionWithBlock: from RLMRealm instances in other threads will block until the current write transaction completes.

Before beginning the write transaction, transactionWithBlock: updates the RLMRealm instance to the latest Realm version, as if refresh had been called, and generates notifications if applicable. This has no effect if the Realm was already up to date.

You can skip notifiying specific notification blocks about the changes made in this write transaction by passing in their associated notification tokens. This is primarily useful when the write transaction is saving changes already made in the UI and you do not want to have the notification block attempt to re-apply the same changes.

The tokens passed to this method must be for notifications for this specific RLMRealm instance. Notifications for different threads cannot be skipped using this method.

Updates the Realm and outstanding objects managed by the Realm to point to the most recent data.

If the version of the Realm is actually changed, Realm and collection notifications will be sent to reflect the changes. This may take some time, as collection notifications are prepared on a background thread. As a result, calling this method on the main thread is not advisable.

Set this property to YES to automatically update this Realm when changes happen in other threads.

If set to YES (the default), changes made on other threads will be reflected in this Realm on the next cycle of the run loop after the changes are committed. If set to NO, you must manually call -refresh on the Realm to update it to get the latest data.

Note that by default, background threads do not have an active run loop and you will need to manually call -refresh in order to update to the latest version, even if autorefresh is set to YES.

Even with this property enabled, you can still call -refresh at any time to update the Realm before the automatic refresh would occur.

Write transactions will still always advance a Realm to the latest version and produce local notifications on commit even if autorefresh is disabled.

Disabling autorefresh on a Realm without any strong references to it will not have any effect, and autorefresh will revert back to YES the next time the Realm is created. This is normally irrelevant as it means that there is nothing to refresh (as managed RLMObjects, RLMArrays, and RLMResults have strong references to the Realm that manages them), but it means that setting RLMRealm.defaultRealm.autorefresh = NO in application:didFinishLaunchingWithOptions: and only later storing Realm objects will not work.

Defaults to YES.

Invalidates all RLMObjects, RLMResults, RLMLinkingObjects, and RLMArrays managed by the Realm.

A Realm holds a read lock on the version of the data accessed by it, so that changes made to the Realm on different threads do not modify or delete the data seen by this Realm. Calling this method releases the read lock, allowing the space used on disk to be reused by later write transactions rather than growing the file. This method should be called before performing long blocking operations on a background thread on which you previously read data from the Realm which you no longer need.

All RLMObject, RLMResults and RLMArray instances obtained from this RLMRealm instance on the current thread are invalidated. RLMObjects and RLMArrays cannot be used. RLMResults will become empty. The Realm itself remains valid, and a new read transaction is implicitly begun the next time data is read from the Realm.

Calling this method multiple times in a row without reading any data from the Realm, or before ever reading any data from the Realm, is a no-op.

Returns the same object as the one referenced when the RLMThreadSafeReference was first created, but resolved for the current Realm for this thread. Returns nil if this object was deleted after the reference was created.

Adds an object to the Realm.

Once added, this object is considered to be managed by the Realm. It can be retrieved using the objectsWhere: selectors on RLMRealm and on subclasses of RLMObject.

When added, all child relationships referenced by this object will also be added to the Realm if they are not already in it.

If the object or any related objects are already being managed by a different Realm an exception will be thrown. Use -[RLMObject createInRealm:withObject:] to insert a copy of a managed object into a different Realm.

The object to be added must be valid and cannot have been previously deleted from a Realm (i.e. isInvalidated must be NO).

Adds all the objects in a collection to the Realm.

This is the equivalent of calling addObject: for every object in a collection.

Adds or updates an existing object into the Realm.

The object provided must have a designated primary key. If no objects exist in the Realm with the same primary key value, the object is inserted. Otherwise, the existing object is updated with any changed values.

As with addObject:, the object cannot already be managed by a different Realm. Use -[RLMObject createOrUpdateInRealm:withValue:] to copy values to a different Realm.

If there is a property or KVC value on object whose value is nil, and it corresponds to a nullable property on an existing object being updated, that nullable property will be set to nil.

Adds or updates all the objects in a collection into the Realm.

This is the equivalent of calling addOrUpdateObject: for every object in a collection.

Deletes an object from the Realm. Once the object is deleted it is considered invalidated.

Deletes one or more objects from the Realm.

This is the equivalent of calling deleteObject: for every object in a collection.

Deletes all objects from the Realm.

Returns the schema version for a Realm at a given local URL.

Performs the given Realm configuration’s migration block on a Realm at the given path.

This method is called automatically when opening a Realm for the first time and does not need to be called explicitly. You can choose to call this method to control exactly when and how migrations are performed.

RLMRealm instances are cached internally by Realm and cannot be created directly.

Use +[RLMRealm defaultRealm], +[RLMRealm realmWithConfiguration:error:] or +[RLMRealm realmWithURL] to obtain a reference to an RLMRealm.

RLMRealm instances are cached internally by Realm and cannot be created directly.

Use +[RLMRealm defaultRealm], +[RLMRealm realmWithConfiguration:error:] or +[RLMRealm realmWithURL] to obtain a reference to an RLMRealm.

Get the RLMSyncSession used by this Realm. Will be nil if this is not a synchronized Realm.