Realm

Path to the file where this Realm is persisted.

Indicates if this Realm was opened in read-only mode.

The Schema used by this realm.

Returns a Configuration that can be used to create this Realm instance.

Indicates if this Realm contains any objects.

The location of the default Realm as a string. Can be overridden.

~/Library/Application Support/{bundle ID}/default.realm on OS X.

default.realm in your application’s documents directory on iOS.

Obtains a Realm instance with the given configuration. Defaults to the default Realm configuration, which can be changed by setting Realm.Configuration.defaultConfiguration.

Obtains a Realm instance persisted at the specified file path.

Obtains a Realm instance with persistence to a specific file path with options.

Like init(path:), but with the ability to open read-only realms and encrypted realms.

Obtains a Realm instance for an un-persisted in-memory Realm. The identifier used to create this instance can be used to access the same in-memory Realm from multiple threads.

Because in-memory Realms are not persisted, you must be sure to hold on to a reference to the Realm object returned from this for as long as you want the data to last. Realm’s internal cache of Realms will not keep the in-memory Realm alive across cycles of the run loop, so without a strong reference to the Realm a new Realm will be created each time. Note that Objects, Lists, and Results that refer to objects persisted in a Realm have a strong reference to the relevant Realm, as do NotifcationTokens.

Helper to perform actions contained within the given block inside a write transation.

Begins a write transaction in a Realm.

Only one write transaction can be open at a time. Write transactions cannot be nested, and trying to begin a write transaction on a Realm which is already in a write transaction with throw an exception. Calls to beginWrite from Realm instances in other threads will block until the current write transaction completes.

Before beginning the write transaction, beginWrite updates the Realm to the latest Realm version, as if refresh() was 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 in the write transaction is kept alive until the write transaction is committed.

Commits all writes operations in the current write transaction.

After this is called, the Realm reverts back to being read-only.

Calling this when not in a write transaction will throw an exception.

Revert all writes made in the current write transaction and end 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 reinstate deleted accessor objects. Any Objects which were added to the Realm will be invalidated rather than switching back to standalone objects. Given the following code:

let oldObject = objects(ObjectType).first!
let newObject = ObjectType()

realm.beginWrite()
realm.add(newObject)
realm.delete(oldObject)
realm.cancelWrite()

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

Calling this when not in a write transaction will throw an exception.

Indicates if this Realm is currently in a write transaction.

Adds or updates an object to be persisted it in this Realm.

When ‘update’ is ‘true’, the object must have a primary key. If no objects exist in the Realm instance with the same primary key value, the object is inserted. Otherwise, the existing object is updated with any changed values.

When added, all linked (child) objects referenced by this object will also be added to the Realm if they are not already in it. If the object or any linked objects already belong to a different Realm an exception will be thrown. Use one of the create functions to insert a copy of a persisted object into a different Realm.

The object to be added must be valid and cannot have been previously deleted from a Realm (i.e. invalidated must be false).

Adds or updates objects in the given sequence to be persisted it in this Realm.

Create an Object with the given value.

Creates or updates an instance of this object and adds it to the Realm populating the object with the given value.

When ‘update’ is ‘true’, the object must have a primary key. If no objects exist in the Realm instance with the same primary key value, the object is inserted. Otherwise, the existing object is updated with any changed values.

Deletes the given object from this Realm.

Deletes the given objects from this Realm.

Deletes all objects from this Realm.

Returns all objects of the given type in the Realm.

Get an object with the given primary key.

Returns nil if no object exists with the given primary key.

This method requires that primaryKey() be overridden on the given subclass.

Add a notification handler for changes in this Realm.

Remove a previously registered notification handler using the token returned from addNotificationBlock(_:)

Whether this Realm automatically updates when changes happen in other threads.

If set to true (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 false, you must manually call -refresh on the Realm to update it to get the latest version.

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

Notifications are sent when a write transaction is committed whether or not this is enabled.

Disabling this on a Realm without any strong references to it will not have any effect, and it will switch back to YES the next time the Realm object is created. This is normally irrelevant as it means that there is nothing to refresh (as persisted Objects, Lists, and Results have strong references to the containing Realm), but it means that setting Realm().autorefresh = false in application(_:didFinishLaunchingWithOptions:) and only later storing Realm objects will not work.

Defaults to true.

Update a Realm and outstanding objects to point to the most recent data for this Realm.

Invalidate all Objects and Results read from this 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 Object, Results and List instances obtained from this Realm on the current thread are invalidated, and can not longer be used. 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. This method cannot be called on a read-only Realm.

Write an encrypted and compacted copy of the Realm to the given path.

The destination file cannot already exist.

Note that if this is called from within a write transaction it writes the current data, and not data when the last write transaction was committed.

Set the encryption key to use when opening Realms at a certain path.

This can be used as an alternative to explicitly passing the key to Realm(path:, encryptionKey:, readOnly:, error:) each time a Realm instance is needed. The encryption key will be used any time a Realm is opened with Realm(path:) or Realm().

If you do not want Realm to hold on to your encryption keys any longer than needed, then use Realm(path:, encryptionKey:, readOnly:, error:) rather than this method.