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Showing content from https://www.mongodb.com/docs/realm-sdks/objc/latest/Classes/RLMObjectId.html below:

RLMObjectId Class Reference

Objective-C

@interface RLMObjectId : NSObject <NSCopying>

Swift

@_nonSendable(_assumed) class RLMObjectId : NSObject, NSCopying, @unchecked Sendable

A 12-byte (probably) unique object identifier.

ObjectIds are similar to a GUID or a UUID, and can be used to uniquely identify objects without a centralized ID generator. An ObjectID consists of:

1. A 4 byte timestamp measuring the creation time of the ObjectId in seconds since the Unix epoch.
2. A 5 byte random value
3. A 3 byte counter, initialized to a random value.

ObjectIds are intended to be fast to generate. Sorting by an ObjectId field will typically result in the objects being sorted in creation order.

• Creates a new randomly-initialized ObjectId.

  Declaration

  Objective-C

  + (nonnull instancetype)objectId;

  Swift

  class func generate() -> Self

• Creates a new zero-initialized ObjectId.

  Declaration

  Objective-C

  - (nonnull instancetype)init;

• Creates a new ObjectId from the given 24-byte hexadecimal string.

  Returns nil and sets error if the string is not 24 characters long or contains any characters other than 0-9a-fA-F.

  Declaration

  Objective-C

  - (nullable instancetype)initWithString:(nonnull NSString *)string
                                    error:(NSError *_Nullable *_Nullable)error;

  Swift

  init(string: String) throws

  Parameters string

  The string to parse.

• Creates a new ObjectId using the given date, machine identifier, process identifier.

  Declaration

  Objective-C

  - (nonnull instancetype)initWithTimestamp:(nonnull NSDate *)timestamp
                          machineIdentifier:(int)machineIdentifier
                          processIdentifier:(int)processIdentifier;

  Swift

  init(timestamp: Date, machineIdentifier: Int32, processIdentifier: Int32)

  Parameters timestamp

  A timestamp as NSDate.

  machineIdentifier

  The machine identifier.

  processIdentifier

  The process identifier.

• Comparision operator to check if the right hand side is greater than the current value.

  Declaration

  Objective-C

  - (BOOL)isGreaterThan:(nullable RLMObjectId *)objectId;

  Swift

  func isGreaterThan(_ objectId: RLMObjectId?) -> Bool

• Comparision operator to check if the right hand side is greater than or equal to the current value.

  Declaration

  Objective-C

  - (BOOL)isGreaterThanOrEqualTo:(nullable RLMObjectId *)objectId;

  Swift

  func isGreaterThanOrEqual(to objectId: RLMObjectId?) -> Bool

• Comparision operator to check if the right hand side is less than the current value.

  Declaration

  Objective-C

  - (BOOL)isLessThan:(nullable RLMObjectId *)objectId;

  Swift

  func isLessThan(_ objectId: RLMObjectId?) -> Bool

• Comparision operator to check if the right hand side is less than or equal to the current value.

  Declaration

  Objective-C

  - (BOOL)isLessThanOrEqualTo:(nullable RLMObjectId *)objectId;

  Swift

  func isLessThanOrEqual(to objectId: RLMObjectId?) -> Bool

• Get the ObjectId as a 24-character hexadecimal string.

  Declaration

  Objective-C

  @property (nonatomic, readonly) NSString *_Nonnull stringValue;

  Swift

  var stringValue: String { get }

• Get the timestamp for the RLMObjectId

  Declaration

  Objective-C

  @property (nonatomic, readonly) NSDate *_Nonnull timestamp;

  Swift

  var timestamp: Date { get }

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