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Realm notification to RX block


Realm notification to RX block

By : Purnaansh P Gunaicha
Date : November 22 2020, 09:00 AM
hop of those help? There is an Rx Realm extension available on GitHub you can use: https://github.com/RxSwiftCommunity/RxRealm
It allows you to get an Observable out of a single Realm object or a Realm Collection. Here's an example from the README:
code :
let realm = try! Realm()
let laps = realm.objects(Lap.self))

Observable.changesetFrom(laps)
  .subscribe(onNext: { results, changes in
    if let changes = changes {
    // it's an update
    print(results)
    print("deleted: \(changes.deleted) inserted: \(changes.inserted) updated: \(changes.updated)")
  } else {
    // it's the initial data
    print(results)
  }
})


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Copying a realm-file seems to cause realm Migration-block call - why?

Copying a realm-file seems to cause realm Migration-block call - why?


By : Narendra Varma
Date : March 29 2020, 07:55 AM
hop of those help? There was previously a bug in Realm where new realm files would have their schema version set to 0 instead of the current schema version, which would trigger a migration in your case.
A fix for this was pushed to the master branch of Realm last week: https://github.com/realm/realm-cocoa/pull/1142
Realm notification block returns unmodified value

Realm notification block returns unmodified value


By : A.Rimah
Date : March 29 2020, 07:55 AM
it fixes the issue Realm.add(_:update:) will result in an object being inserted if no existing object exists with the same primary key, or modified if an existing object does exist. The modifications you're seeing in your collection notification block are likely generated as a result of Realm.add(_:update:) modifying an existing object.
Note that this also applies to any relationships your object has with other managed objects. If the related objects have a primary key defined then they too will be updated if they already exist. This will result in any objects that they're already related to being marked as modified.
Force Realm notification block to run before proceeding

Force Realm notification block to run before proceeding


By : Marco Cardona
Date : March 29 2020, 07:55 AM
To fix the issue you can do The right way to do this in a fully reactive application would be to perform the animation based on the notification coming in. This way, no matter how an object is being added (getDataFromServer, a bg thread, or even a different process), your app would react the same way.
This leads to simpler code while being more robust.
Realm - Delete objects from realm in migration block

Realm - Delete objects from realm in migration block


By : Anna Kuznetsova
Date : March 29 2020, 07:55 AM
wish helps you I need to delete objects from a realm during a migration. , You can tell Realm to delete when migration needed.
code :
Realm.Configuration.defaultConfiguration = Realm.Configuration(
    schemaVersion: 10,
    migrationBlock: { migration, oldSchemaVersion in


    },
    deleteRealmIfMigrationNeeded: true
)
How do I work with realm notification if result is updated after notification is initialized?

How do I work with realm notification if result is updated after notification is initialized?


By : Siva Vsg
Date : March 29 2020, 07:55 AM
I wish this helpful for you You overwrite results in updateSearchResults(). Notification and notificationToken is tied to specific Results object and query. So if you overwrite results by another query, you should stop the previous notification, then re-add notification to the new results object.
So updateSearchResults() method should be like the following:
code :
func updateSearchResults(for searchController: UISearchController) {
    let searchText = searchController.searchBar.text!
    if searchText.isEmpty == false {
        results = results?.realm?.objects(Person.self).filter("active = '1'")
        results = results?.filter("name BEGINSWITH[c] %@ OR lastName CONTAINS[c] %@", searchText, searchText)
        results = results?.sorted(byProperty: "name", ascending: true)
    }
    else {
        results = results?.realm?.objects(Person.self).filter("active = '1'").sorted(byProperty: "name", ascending: true)
    }

    notificationToken.stop()
    notificationToken = results?.addNotificationBlock { [weak self] (changes: RealmCollectionChange) in
        guard let tableView = self?.tableView else { return }
        switch changes {
        case .initial:
            tableView.reloadData()
            break
        case .update(_, let deletions, let insertions, let modifications):
            tableView.beginUpdates()

            tableView.insertRows(at: insertions.map { IndexPath(row: $0, section: 0) }, with: .automatic)

            tableView.deleteRows(at: deletions.map { IndexPath(row: $0, section: 0) }, with: .automatic)
            tableView.reloadRows(at: modifications.map { IndexPath(row: $0, section: 0) }, with: .automatic)
            tableView.endUpdates()
            break
        case .error(let error):
            print("Error: \(error)")
            break
        }
    }
}
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