11.0.0

11.0.0 (2023-05-08)

Breaking changes

• The error argument in NotificationCallbackDelegate and DictionaryNotificationCallbackDelegate used in *collection*.SubscribeForNotifications has been removed. It has been unused for a long time, since internal changes to the database made it impossible for errors to occur during notification callbacks. (Issue #3014)
• Removed RealmObjectBase.GetBacklinks - instead RealmObjectBase.DynamicApi.GetBacklinksFromType should be used. (Issue #2391)
• Removed Realm.DynamicApi.CreateObject(string, object) and replaced it with more specialized overloads:
  • RealmObjectBase.DynamicApi.CreateObject(string) can be used to create an object without a primary key.
  • RealmObjectBase.DynamicApi.CreateObject(string, string/long?/ObjectId?/Guid?) can be used to create an object with a primary key of the corresponding type.
• The API exposed by Realm.DynamicApi no longer return dynamic, instead opting to return concrete types, such as IRealmObject, IEmbeddedObject, and so on. You can still cast the returned objects to dynamic and go through the dynamic API, but that's generally less performant than using the string-based API, such as IRealmObjectBase.DynamicApi.Get/Set, especially on AOT platforms such as iOS or Unity. (Issue #2391)
• Removed Realm.WriteAsync(Action<Realm>) in favor of Realm.WriteAsync(Action). The new WriteAsync method introduced in 10.14.0 is more efficient and doesn't require reopening the Realm on a background thread. While not recommended, if you prefer to get the old behavior, you can write an extension method like:

  public static async Task WriteAsync(this Realm realm, Action<Realm> writeAction)
  {
    await Task.Run(() =>
    {
      using var bgRealm = Realm.GetInstance(realm.Config);
      bgRealm.Write(() =>
      {
        writeAction(bgRealm);
      });
    });
  
    await realm.RefreshAsync();
  }

  (PR #3234)
• Removed InMemoryConfiguration.EncryptionKey. It was never possible to encrypt in-memory Realms and setting that property would have resulted in runtime errors. (PR #3236)
• Removed SyncConfiguration - use PartitionSyncConfiguration or FlexibleSyncConfiguration instead. (PR #3237)
• Removed Realm.GetSession - use Realm.SyncSession instead. (PR #3237)
• Removed DiscardLocalResetHandler - use DiscardUnsyncedChangedHandler instead. (PR #3237)
• Removed Session.SimulateClientReset extensions. These didn't work with automatic reset handlers and were more confusing than helpful. (PR #3237)
• Removed AppConfiguration.CustomLogger and AppConfiguration.LogLevel - use Logger.Default and Logger.LogLevel instead. (PR #3238)
• Removed RealmConfigurationBase.ObjectClasses - use RealmConfigurationBase.Schema instead. (PR #3240)
• Removed ObjectSchema.IsEmbedded - use ObjectSchema.BaseType instead. (PR #3240)
• Removed ObjectSchema.Builder.IsEmbedded - use ObjectSchema.Builder.RealmSchemaType instead. (PR #3240)
• Removed ObjectSchema.Builder(string name, bool isEmbedded = false) - use Builder(string name, ObjectSchemaType schemaType) instead. (PR #3240)
• Removed RealmSchema.Find - use RealmSchema.TryFindObjectSchema instead. (PR #3240)
• Removed User.GetPushClient as it has been deprecated in Atlas App Services - see https://www.mongodb.com/docs/atlas/app-services/reference/push-notifications/. (PR #3241)
• Removed SyncSession.Error event - use SyncConfigurationBase.OnSessionError when opening a Realm instead. (PR #3241)
• Removed the parameterless constructor for ManualRecoveryHandler - use the one that takes a callback instead. (PR #3241)
• RealmValue.AsString will now throw an exception if the value contains null. If you want to get a nullable string, use AsNullableString. (PR #3245)
• RealmValue.AsData will now throw an exception if the value contains null. If you want to get a nullable byte[], use AsNullableData. (PR #3245)
• RealmValue.AsRealmObject will now throw an exception if the value contains null. If you want to get a nullable string, use AsNullableRealmObject. (PR #3245)
• Realm.SyncSession will now throw an error if the Realm is not opened with a PartitionSyncConfiguration or FlexibleSyncConfiguration - before it used to return null. (PR #3245)
• Realm.Subscriptions will now throw an error if the Realm is not opened with a FlexibleSyncConfiguration - before it used to return null. (PR #3245)
• Removed PermissionDeniedException as it was no longer possible to get it. (Issue #3272)
• Removed some obsolete error codes from the ErrorCode enum. All codes removed were obsolete and no longer emitted by the server. (PR 3273)
• Removed IncompatibleSyncedFileException as it was no longer possible to get it. (Issue #3167)
• The Realms.Schema.Property API now use IndexType rather than a boolean indicating whether a property is indexed. (Issue #3281)
• The extension methods in StringExtensions (Like, Contains) are now deprecated. Use the identical ones in QueryMethods instead - e.g. realm.All<Foo>().Where(f => f.Name.Like("Mic*l")) would need to be rewritten like realm.All<Foo>().Where(f => QueryMethods.Like(f.Name, "Mic*l")).

Enhancements

• Added nullability annotations to the Realm assembly. Now methods returning reference types are correctly annotated to indicate whether the returned value may or may not be null. (Issue #3248)
• Replacing a value at an index (i.e. myList[1] = someObj) will now correctly raise CollectionChange notifications with the Replace action. (Issue #2854)
• It is now possible to change the log level at any point of the application's lifetime. (PR #3277)
• Some log messages have been added to the Core database. Events, such as opening a Realm or committing a transaction will now be logged. (Issue #2910)
• Added support for Full-Text search (simple term) queries. (Issue #3281)
  • To enable FTS queries on string properties, add the [Indexed(IndexType.FullText)] attribute.
  • To run LINQ queries, use QueryMethods.FullTextSearch: realm.All<Book>().Where(b => QueryMethods.FullTextSearch(b.Description, "fantasy novel")).
  • To run Filter queries, use the TEXT operator: realm.All<Book>().Filter("Description TEXT $0", "fantasy novel").
• Performance improvement for the following queries (Core 13.8.0):
  • Significant (~75%) improvement when counting (IQueryable.Count()) the number of exact matches (with no other query conditions) on a string/int/UUID/ObjectID property that has an index. This improvement will be especially noticiable if there are a large number of results returned (duplicate values).
  • Significant (~99%) improvement when querying for an exact match on a DateTimeOffset property that has an index.
  • Significant (~99%) improvement when querying for a case insensitive match on a RealmValue property that has an index.
  • Moderate (~25%) improvement when querying for an exact match on a Boolean property that has an index.
  • Small (~5%) improvement when querying for a case insensitive match on a RealmValue property that does not have an index.
  • Moderate (~30%) improvement of equality queries on a non-indexed RealmValue.
• Enable multiple processes to operate on an encrypted Realm simultaneously. (Core 13.9.0)
• Improve performance of rolling back write transactions after making changes. If no notifications events are subscribed to, this is now constant time rather than taking time proportional to the number of changes to be rolled back. Rollbacks when there are notifications subscriptions are 10-20% faster. (Core 13.9.4)
• PBS to FLX Migration for migrating a client app that uses partition based sync to use flexible sync under the hood if the server has been migrated to flexible sync. (Core 13.10.0)

Fixed

• Fixed an issue that could cause a The specified table name is already in use exception when creating a new Realm file on multiple threads. (Issue #3302)
• Fixed a bug that may have resulted in arrays being in different orders on different devices. Some cases of “Invalid prior_size” may be fixed too. (Core 13.7.1)
• Fixed a crash when querying a RealmValue propert...

10.21.1

10.21.1 (2023-04-21)

Fixed

• Fixed a crash that occurs when the server sends a PermissionDenied error. (Issue #3292)

Compatibility

• Realm Studio: 13.0.0 or later.

Internal

• Using Core 13.6.0.

10.21.0

10.21.0 (2023-03-24)

Enhancements

• Added SyncConfiguration.CancelAsyncOperationsOnNonFatalErrors which controls whether async operations (such as Realm.GetInstanceAsync, Session.WaitForUploadAsync and so on) should throw an exception whenever a non-fatal session error occurs. (Issue #3222)
• Added AppConfiguration.SyncTimeoutOptions which has a handful of properties that control sync timeouts, such as the connection timeout, ping-pong intervals, and others. (Issue #3223)
• Updated some of the exceptions being thrown by the SDK to align them better with system exceptions and include more information - for example, we'll now throw ArgumentException when invalid arguments are provided rather than RealmException. (Issue #2796)
• Added a new exception - CompensatingWriteException that contains information about the writes that have been reverted by the server due to permissions. It will be passed to the supplied FlexibleSyncConfiguration.OnSessionError callback similarly to other session errors. (Issue #3258)

Fixed

• Changed the way the Realm SDK registers BsonSerializers. Previously, it would indiscriminately register them via BsonSerializer.RegisterSerializer, which would conflict if your app was using the MongoDB.Bson package and defined its own serializers for DateTimeOffset, decimal, or Guid. Now, registration happens via BsonSerializer.RegisterSerializationProvider, which means that the default serializers used by the SDK can be overriden by calling BsonSerializer.RegisterSerializer at any point before a serializer is instantiated or by calling BsonSerializer.RegisterSerializationProvider after creating an App/opening a Realm. (Issue #3225)
• Creating subscriptions with queries having unicode parameters causes a server error. (Core 13.6.0)

Compatibility

• Realm Studio: 13.0.0 or later.

Internal

• Using Core 13.6.0.
• Cancel existing builds when a new commit is pushed to a PR. (PR #3260)

10.20.0

10.20.0 (2023-02-10)

File format version bumped. Old files will be automatically upgraded but cannot be downgraded and opened with older versions of the .NET SDK.

Breaking Changes

• User.GetPushClient has been deprecated as it will be disabled soon on the server. (Issue #3073)

Enhancements

• The realm file will be shrunk if the larger file size is no longer needed. (Core 13.0.0)

• Most of the file growth caused by version pinning is eliminated. (Core 13.0.0)

• Improve performance of acquiring read locks when a read lock for that version is already held. This speeds up many operations related to change notifications, and particularly refreshing a Realm which has change notifiers registered. (Core 13.2.0)

• Upgrade OpenSSL from 1.1.1n to 3.0.7. (Core 13.2.0)

• Converting flexible sync realms to bundled and local realms is now supported (Core 13.2.0)

• Add support for nested classes for source generated classes. (Issue #3031)

• Enhanced support for nullable reference types in the model definition for source generated classes. This allows to use realm models as usual when nullable context is active, and removes the need to use of the Required attribute to indicate required properties, as this information will be inferred directly from the nullability status. There are some considerations regarding the nullability of properties that link to realm object:

  • Properties that link to a single realm object are inherently nullable, and thus the type must be defined as nullable.
  • List, Sets and Backlinks cannot contain null objects, and thus the type parameter must be non-nullable.
  • Dictionaries can contain null values, and thus the type parameter must be nullable.

  Defining the properties with a different nullability annotation than what has been outlined here will raise a diagnostic error. For instance:

  public partial class Person: IRealmObject
  {
      //Single values
      public Dog? MyDog { get; set; } //Correct
  
      public Dog MyDog { get; set; } //Error
  
      //List
      public IList<Dog> MyDogs { get; } //Correct
  
      public IList<Dog?> MyDogs { get; } //Error
  
      //Set
      public ISet<Dog> MyDogs { get; } //Correct
  
      public ISet<Dog?> MyDogs { get; } //Error
  
      //Dictionary
      public IDictionary<string, Dog?> MyDogs { get; } //Correct
  
      public IDictionary<string, Dog> MyDogs { get; } //Error
  
      //Backlink
      [Realms.Backlink("...")]
      public IQueryable<Dog> MyDogs { get; } //Correct
  
      [Realms.Backlink("...")]
      public IQueryable<Dog?> MyDogs { get; } //Error
  }

  We realise that some developers would still prefer to have more freedom in the nullability annotation of such properties, and it is possible to do so by setting realm.ignore_objects_nullability = true in a global configuration file (more information about global configuration files can be found in the .NET documentation). If this is enabled, all the previous properties will be considered valid, and the nullability annotations for properties linking to objects will be ignored.

• Improved performance of PropertyChanged and CollectionChanged notifications. (Issue #3112)

• Added support for tvOS in Xamarin/MAUI and Unity applications. (Issue #3161)

• Improve the performance of Realm.Freeze(). (Core 13.3.0)

Fixed

• ISet<RealmValue> consider string and binary data equivalent. This could cause the client to be inconsistent with the server if a string and some binary data with equivalent content was inserted from Atlas. (Core 13.0.0)
• Fixed wrong assertion on query error that could result in a crash. (Core 13.1.0)
• Fixed an issue preventing opening an encrypted file on a device with a page size bigger than the one on which the file was produced. (Core 13.1.1)
• Fixed possible segfault in sync client where async callback was using object after being deallocated (Core 13.2.0)
• Fixed crash when using client reset with recovery and flexible sync with a single subscription (Core 13.2.0)
• Added a more descriptive error message when a model's property is unsupported. It'll now suggest that the target type may need to inherit from RealmObject. (Issue #3162)
• Disposing a Realm instance while an active transaction is running will now correctly roll back the transaction. (Issue #2924)
• Fixed an issue that would cause PropertyChanged notifications to be delivered for collection properties when the content of the collection was modified even if the collection itself was not replaced. (Issue #3112)
• Fixed an issue where weaving assemblies on Unity could result in System.InvalidOperationException. (Issue #3199)
• Session.Stop will now correctly keep the session stopped until Session.Start is called. Previously, there were a number of circumstances that could cause the session to be resumed, even if not explicitly requested. (Core 13.3.0)
• When client reset with recovery is used and the recovery does not actually result in any new local commits, the sync client may have gotten stuck in a cycle with a A fatal error occured during client reset: 'A previous 'Recovery' mode reset from did not succeed, giving up on 'Recovery' mode to prevent a cycle' error message. (Core 13.3.0)
• Fixed diverging history in flexible sync if writes occur during bootstrap to objects that just came into view. (Core 13.3.0)
• Fix several data races when opening cached frozen Realms. New frozen Realms were added to the cache and the lock released before they were fully initialized, resulting in races if they were immediately read from the cache on another thread. (Core 13.3.0)
• If a client reset w/recovery or discard local is interrupted while the "fresh" realm is being downloaded, the sync client may crash with a MultpleSyncAgents exception. (Core 13.3.0)
• Changesets from the server sent during FLX bootstrapping that are larger than 16MB can cause the sync client to crash with a LogicError. (Core 13.3.0)
• Sharing Realm files between a Catalyst app and Realm Studio did not properly synchronize access to the Realm file. (Core 13.4.0)

Compatibility

• Realm Studio: 13.0.0 or later.

Internal

• Using Core 13.4.0.
• Updated DynamicRealmObjectHelper.TryGetPrimaryKeyValue not to use reflection. (Issue #3166)
• Fixed UWP tests workflow when running a debug build. (Issue #3030)

10.19.0

10.19.0 (2023-01-06)

Enhancements

• Removed redundant serialization/deserialization of arguments in CallAsync. (Issue #3079)

• Added a field Transaction.State which describes the current state of the transaction. (Issue #2551)

• Improved error message when null is passed as argument to params for EmailPasswordAuth.CallResetPasswordFunctionAsync. (Issue #3011)

• Removed backing fields of generated classes' properties which should provide minor improvements to memory used by Realm Objects (Issue #2647)

• Added two extension methods on IDictionary to get an IQueryable collection wrapping the dictionary's values:

  • dictionary.AsRealmQueryable() allows you to get a IQueryable<T> from IDictionary<string, T> that can be then treated as a regular queryable collection and filtered/ordered with LINQ or Filter(string).
  • dictionary.Filter(query, arguments) will filter the list and return a filtered collection of dictionary's values. It is roughly equivalent to dictionary.AsRealmQueryable().Filter(query, arguments).

  The resulting queryable collection will behave identically to the results obtained by calling realm.All<T>(), i.e. it will emit notifications when it changes and automatically update itself. (Issue #2647)

• Improve performance of client reset with automatic recovery and converting top-level tables into embedded tables. (Core upgrade)

• Flexible sync will now wait for the server to have sent all pending history after a bootstrap before marking a subscription as Complete. (Core upgrade)

• Slightly improve performance of Realm.RemoveAll() which removes all objects from an open Realm database. (Issue #2233)

• Improve error messages when not setting a BaseFilePath for realm or app configuration. (Issue 2863)

• Added diagnostic error for nested classes used with the source generator syntax, as they are not yet supported. (Issue #3130)

• Added IList implementation to all Realm collections to allow for UWP ListView databinding. (Issue #1759)

Fixed

• Fixed issue where Realm parameters' initialization would get run twice, resulting in unexpected behavior.
• Prevented IEmbeddedObjects and IAsymmetricObjects from being used as RealmValues when added to a realm, and displaying more meaningful error messages.
• Fix a use-after-free if the last external reference to an encrypted Realm was closed between when a client reset error was received and when the download of the new Realm began. (Core upgrade)
• Fixed an assertion failure during client reset with recovery when recovering a list operation on an embedded object that has a link column in the path prefix to the list from the top level object. (Core upgrade)
• Opening an unencrypted file with an encryption key would sometimes report a misleading error message that indicated that the problem was something other than a decryption failure. (Core upgrade)
• Fix a rare deadlock which could occur when closing a synchronized Realm immediately after committing a write transaction when the sync worker thread has also just finished processing a changeset from the server. (Core upgrade)
• Fix a race condition which could result in "operation cancelled" errors being delivered to async open callbacks rather than the actual sync error which caused things to fail. (Core upgrade)
• Bootstraps will not be applied in a single write transaction - they will be applied 1MB of changesets at a time, or as configured by the SDK. (Core upgrade)
• Fix database corruption and encryption issues on apple platforms. (Core upgrade)
• Added fully qualified names for source generated files, to avoid naming collisions. (Issue #3099
• Fixed an issue that would cause an exception when using unmanaged objects in bindings (Issue #3094)
• Fixed an issue where fetching a user's profile while the user logs out would result in an assertion failure. (Core upgrade)
• Removed the ".tmp_compaction_space" file being left over after compacting a Realm on Windows. (Core upgrade)
• Fixed a crash that would occur if you close a synchronized Realm while waiting for SubscriptionSet.WaitForSynchronizationAsync. (Issue #2952)
• Avoid calling the setter on UI-bound properties in case the new value of the property is the same as the current one. This avoids some issue with MAUI, that seems to be calling the setter of bound properties unnecessarily when CollectionView/ListView are shown on screen. This is problematic if the object does not belong to the current user's permissions, as it will cause a compensanting write. In some limited cases this could cause an error loop (verified on iOS) when recycling of cells is involved. (Issue #3128)
• Fixes an issue with where the source generator will not add the namespace for types used in properties' initializers. (Issue #3135)
• Fixed an issue that would prevent Realm from working correctly in Unity applications that have Domain Reloading turned off. (Issue #2898)
• Fixed a bug when using string.Contains in .NET 2.1 or later where the search string is not a literal. (Issue #3134)
• Added [Obsolete] notice for a few ErrorCode enum members that are no longer in use. (Issue #3155

Compatibility

• Realm Studio: 12.0.0 or later.

Internal

• Using Core 12.13.0.
• Replaced Realm.RefreshAsync with a native implementation. (PR #2995)

10.18.0

10.18.0 (2022-11-02)

Enhancements

• Introduced Realm.SourceGenerator, a Source Generator that can generate Realm model classes. This is part of our ongoing effort to modernize the Realm library, and will allow to introduce certain language level features easier in the future.
  In order to use the source generation the model classes need to be declared implementing one of the base interfaces (IRealmObject, IEmbeddedObject or IAsymmetricObject) and be declared partial. For example:

  public partial class Person: IRealmObject
  {
      public int Age { get; set; }
  
      public string Name { get; set; }  
  
      public PhoneNumber Phone { get; set; }
  }
  
  public partial class PhoneNumber: IEmbeddedObject
  {
      public string Number { get; set; }
  
      public string Prefix { get; set; }  
  }

  The source generator will then take care of adding the full implementation for the interfaces.

  Most of the time converting the "classic" Realm model classes (classes derived from RealmObject, EmbeddedObject or AsymmetricObject) to use the new source generation means just defining the class as partial and switching out the base class for the corresponding interface implementation.
  The classic Realm model definition will still be supported, but will be phased out in the future.

  Please note that the source generator is still in beta, so let us know if you experience any issue while using them.
  Some additional notes:

  • OnManaged and OnPropertyChanged are now partial methods.
  • Inheritance is not supported, so the Realm models cannot derive from any other class.
  • Nested classes are not supported.

Fixed

• Fixed a NullReferenceException being thrown when subscribing to PropertyChanged notifications on a Session instance that is then garbage collected prior to unsubscribing. (PR #3061)
• Removed bitcode support from the iOS binary as it's no longer accepted for App Store submissions. (Issue #3059)
• Slightly increased performance and reduced allocations when creating an enumerator for frozen collections (Issue #2815).

Compatibility

• Realm Studio: 11.0.0 or later.

Internal

• Using Core 12.9.0.
• Added workflow to automatically assign users to issues and PRs. (PR #3069)
• Added workflow to validate changelog has been updated. (PR #3069)

10.17.0

10.17.0 (2022-10-06)

Enhancements

• Prioritize integration of local changes over remote changes - shorten the time users may have to wait when committing local changes. Stop storing downloaded changesets in history. (Core upgrade)
• Greatly improve the performance of sorting or distincting a Dictionary's keys or values. The most expensive operation is now performed O(log N) rather than O(N log N) times, and large Dictionaries can see upwards of 99% reduction in time to sort. (Core upgrade)
• Seamlessly handle migrating an App Services application deployment model. (Core upgrade)

Fixed

• Fix a use-after-free when a sync session is closed and the app is destroyed at the same time. (Core upgrade)
• Fixed a NullReferenceException occurring in RealmObjectBase's finalizer whenever an exception is thrown before the object gets initialized. (Issue #3045)

Compatibility

• Realm Studio: 11.0.0 or later.

Internal

• Using Core 12.9.0

10.16.0

10.16.0 (2022-10-03)

Enhancements

• Introduced AsymmetricObject intended for write-heavy workloads, where high performance is generally important. This new object:

  1. syncs data unidirectionaly, from the clients to the server
  2. can't be queried, deleted, or modified once added to the Realm
  3. is only usable with flexible sync
  4. can't be the receiveing end of any type of relationship
  5. can contain EmbeddedObjects but cannot link to RealmObject or AsymmetricObject.

  In the same write transaction, it is legal to add AsymmetricObjects and RealmObjects

  class Measurement : AsymmetricObject
  {
      [PrimaryKey, MapTo("_id")]
      public Guid Id { get; private set; } = Guid.NewGuid();
  
      public double Value { get; set; }
  
      public DataTimeOffset Timestamp { get; private set; } = DateTimeOffset.UtcNow;
  }
  
  class Person : RealmObject
  {
      //............
  }
  
  //.....
  
  var measurement = new Measurement
  {
    Value = 9.876
  };
  
  realm.Write(() =>
  {
      realm.Add(measurement);
  
      realm.Add(new Person());
  });
  
  _ = asymmetricObject.Value;   // runtime error
  _ = realm.All<Measurement>(); // compile time error

• Added two client reset handlers, RecoverUnsyncedChangesHandler and RecoverOrDiscardUnsyncedChangesHandler, that try to automatically merge the unsynced local changes with the remote ones in the event of a client reset. Specifically with RecoverOrDiscardUnsyncedChangesHandler, you can fallback to the discard local strategy in case the automatic merge can't be performed as per your server's rules. These new two stragegies simplify even more the handling of client reset events when compared to DiscardUnsyncedChangesHandler.RecoverOrDiscardUnsyncedChangesHandler is going to be the default from now on. An example is as follows

• Added two client reset handlers, RecoverUnsyncedChangesHandler and RecoverOrDiscardUnsyncedChangesHandler, that try to automatically merge the unsynced local changes with the remote ones in the event of a client reset. Specifically with RecoverOrDiscardUnsyncedChangesHandler, you can fallback to the discard unsynced strategy in case the automatic merge can't be performed as per your server's rules. These new two stragegies simplify even more the handling of client reset events when compared to DiscardUnsyncedChangesHandler.RecoverOrDiscardUnsyncedChangesHandler is going to be the default from now on. More info on the aforementioned strategies can be found in our docs page. An example usage of one of the new handler is as follows:

  var conf = new PartitionSyncConfiguration(partition, user)
  {
    ClientResetHandler = new RecoverOrDiscardUnsyncedChangesHandler
    {
      // As always, the following callbacks are optional
  
      OnBeforeReset = (beforeFrozen) =>
      {
        // executed right before a client reset is about to happen
      },
      OnAfterRecovery = (beforeFrozen, after) =>
      {
        // executed right after an automatic recovery from a client reset has completed
      },
      OnAfterDiscard = (beforeFrozen, after) =>
      {
        // executed after an automatic recovery from a client reset has failed but the DiscardUnsyncedChanges fallback has completed
      },
      ManualResetFallback = (session, err) =>
      {
        // handle the reset manually
      }
    }
  };

  (PR #2745)

• Introducing string query support for constant list expressions such as realm.All<Car>().Filter("Color IN {'blue', 'orange'}"). This also includes general query support for list vs list matching such as realm.All<Car>().Filter("NONE Features IN {'ABS', 'Seat Heating'}"). (Core upgrade)

• Improve performance when a new Realm file connects to the server for the first time, especially when significant amounts of data has been written while offline. (Core upgrade)

• Shift more of the work done on the sync worker thread out of the write transaction used to apply server changes, reducing how long it blocks other threads from writing. (Core upgrade)

• Improve the performance of the sync changeset parser, which speeds up applying changesets from the server. (Core upgrade)

Fixed

• Added a more meaningful error message whenever a project doesn't have [TargetFramework] defined. (Issue #2843)
• Opening a read-only Realm for the first time with a SyncConfiguration did not set the schema version, which could lead to m_schema_version != ObjectStore::NotVersioned assertion failures. (Core upgrade)
• Upload completion callbacks (i.e. Session.WaitForUploadAsync) may have called before the download message that completed them was fully integrated. (Core upgrade)
• Fixed an exception "fcntl() with F_BARRIERFSYNC failed: Inappropriate ioctl for device" when running with MacOS on an exFAT drive. (Core upgrade)
• Syncing of a Decimal128 with big significand could result in a crash. (Core upgrade)
• Realm.Refresh() did not actually advance to the latest version in some cases. If there was a version newer than the current version which did not require blocking it would advance to that instead, contrary to the documented behavior. (Core upgrade)
• Several issues around notifications were fixed. (Core upgrade)
  • Fix a data race on RealmCoordinator::m_sync_session which could occur if multiple threads performed the initial open of a Realm at once.
  • If a SyncSession outlived the parent Realm and then was adopted by a new Realm for the same file, other processes would not get notified for sync writes on that file.
  • Fix one cause of QoS inversion warnings when performing writes on the main thread on Apple platforms. Waiting for async notifications to be ready is now done in a QoS-aware ways.
• If you set a subscription on a link in flexible sync, the server would not know how to handle it (#5409, since v11.6.1)
• If a case insensitive query searched for a string including an 4-byte UTF8 character, the program would crash. (Core upgrade)
• Added validation to prevent adding a removed object using Realm.Add. (Issue #3020)

Compatibility

• Realm Studio: 12.0.0 or later.

Internal

• Using Core 12.7.0.

10.15.1

10.15.1 (2022-08-08)

Fixed

• Fixed an issue introduced in 10.15.0 that would prevent non-anonoymous user authentication against Atlas App Services. (Issue #2987)
• Added override to User.ToString() that outputs the user id and provider. (PR #2988)
• Added == and != operator overloads to User that matches the behavior of User.Equals. (PR #2988)

Compatibility

• Realm Studio: 12.0.0 or later.

Internal

• Using Core x.y.z.

10.15.0

10.15.0 (2022-08-05)

Enhancements

• Preview support for .NET 6 with Mac Catalyst and MAUI. (PR #2959)
• Reduce use of memory mappings and virtual address space (Core upgrade)

Fixed

• Fix a data race when opening a flexible sync Realm (Core upgrade).
• Fixed a missing backlink removal when setting a RealmValue from a RealmObject to null or any other non-RealmObject value. Users may have seen exception of "key not found" or assertion failures such as mixed.hpp:165: [realm-core-12.1.0] Assertion failed: m_type when removing the destination object. (Core upgrade)
• Fixed an issue on Windows that would cause high CPU usage by the sync client when there are no active sync sessions. (Core upgrade)
• Improved performance of sync clients during integration of changesets with many small strings (totalling > 1024 bytes per changeset) on iOS 14, and devices which have restrictive or fragmented memory. (Core upgrade)
• Fix exception when decoding interned strings in realm-apply-to-state tool. (Core upgrade)
• Fix a data race when committing a transaction while multiple threads are waiting for the write lock on platforms using emulated interprocess condition variables (most platforms other than non-Android Linux). (Core upgrade)
• Fix some cases of running out of virtual address space (seen/reported as mmap failures) (Core upgrade)
• Decimal128 values with more than 110 significant bits were not synchronized correctly with the server (Core upgrade)

Compatibility

• Realm Studio: 11.0.0 or later.

Internal

• Using Core 12.4.0.