RLMRealmConfiguration

@interface RLMRealmConfiguration : NSObject <NSCopying>

An RLMRealmConfiguration instance describes the different options used to create an instance of a Realm.

RLMRealmConfiguration instances are just plain NSObjects. Unlike RLMRealms and RLMObjects, they can be freely shared between threads as long as you do not mutate them.

Creating configuration objects for class subsets (by setting the objectClasses property) can be expensive. Because of this, you will normally want to cache and reuse a single configuration object for each distinct configuration rather than creating a new object each time you open a Realm.

Default Configuration

  • Returns the default configuration used to create Realms when no other configuration is explicitly specified (i.e. +[RLMRealm defaultRealm]).

    Declaration

    Objective-C

    + (nonnull instancetype)defaultConfiguration;

    Swift

    class func `default`() -> Self

    Return Value

    The default Realm configuration.

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  • Sets the default configuration to the given RLMRealmConfiguration.

    Declaration

    Objective-C

    + (void)setDefaultConfiguration:(nonnull RLMRealmConfiguration *)configuration;

    Swift

    class func setDefault(_ configuration: RLMRealmConfiguration)

    Parameters

    configuration

    The new default Realm configuration.
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Properties

  • The local URL of the Realm file. Mutually exclusive with inMemoryIdentifier.

    Declaration

    Objective-C

    @property (readwrite, copy, nonatomic, nullable) NSURL *fileURL;

    Swift

    var fileURL: URL? { get set }
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  • A string used to identify a particular in-memory Realm. Mutually exclusive with fileURL.

    Declaration

    Objective-C

    @property (readwrite, copy, nonatomic, nullable) NSString *inMemoryIdentifier;

    Swift

    var inMemoryIdentifier: String? { get set }
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  • A 64-byte key to use to encrypt the data, or nil if encryption is not enabled.

    Declaration

    Objective-C

    @property (readwrite, copy, nonatomic, nullable) NSData *encryptionKey;

    Swift

    var encryptionKey: Data? { get set }
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  • Whether to open the Realm in read-only mode.

    This is required to be able to open Realm files which are not writeable or are in a directory which is not writeable. This should only be used on files which will not be modified by anyone while they are open, and not just to get a read-only view of a file which may be written to by another thread or process. Opening in read-only mode requires disabling Realm’s reader/writer coordination, so committing a write transaction from another process will result in crashes.

    Declaration

    Objective-C

    @property (assign, readwrite, nonatomic) BOOL readOnly;

    Swift

    var readOnly: Bool { get set }
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  • The current schema version.

    Declaration

    Objective-C

    @property (assign, readwrite, nonatomic) uint64_t schemaVersion;

    Swift

    var schemaVersion: UInt64 { get set }
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  • The block which migrates the Realm to the current version.

    Declaration

    Objective-C

    @property (readwrite, copy, nonatomic, nullable)
    RLMMigrationBlock migrationBlock;
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  • Whether to recreate the Realm file with the provided schema if a migration is required. This is the case when the stored schema differs from the provided schema or the stored schema version differs from the version on this configuration. Setting this property to YES deletes the file if a migration would otherwise be required or executed.

    Note

    Setting this property to YES doesn’t disable file format migrations.

    Declaration

    Objective-C

    @property (assign, readwrite, nonatomic) BOOL deleteRealmIfMigrationNeeded;

    Swift

    var deleteRealmIfMigrationNeeded: Bool { get set }
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  • A block called when opening a Realm for the first time during the life of a process to determine if it should be compacted before being returned to the user. It is passed the total file size (data + free space) and the total bytes used by data in the file.

    Return YES to indicate that an attempt to compact the file should be made. The compaction will be skipped if another process is accessing it.

    Declaration

    Objective-C

    @property (readwrite, copy, nonatomic, nullable)
    RLMShouldCompactOnLaunchBlock shouldCompactOnLaunch;

    Swift

    var shouldCompactOnLaunch: RLMShouldCompactOnLaunchBlock? { get set }
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  • The classes managed by the Realm.

    Declaration

    Objective-C

    @property (readwrite, copy, nonatomic, nullable) NSArray *objectClasses;

    Swift

    var objectClasses: [Any]? { get set }
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