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Questions tagged [realm]

Realm, formally known as MongoDB Realm, is an object-oriented database widely used as an alternative to SQLite & ORMs that includes a built-in device-to-cloud data sync. Realm supports a variety of platforms including Android, iOS, Linux, macOS, and Windows.

Realm formally known as MongoDB Realm, is an object-oriented database widely used as an alternative to CoreDate, SQLite & ORMs. Realm supports a variety of platforms including Android, iOS, Linux, macOS, and Windows.

Realm can be used as a local-only data store or synchronized to MongoDB’s multi-cloud database platform Atlas via a built-in, real-time device-to-cloud sync service – Realm Sync.

Originally released in 2016, Realm was acquired by MongoDB in 2019. It remains open source under the Apache License.

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"foreign key" as primary key in realm

I'm getting started with realm and trying to figure out the best way to write my model layer, so after overthinking about it I decide to ask here to get some opinions. Here we go: I'm writing a realm version of these tables: Account id - String…
Filipe Alvarenga
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Running my most recent Realm migration hangs

So I added some new properties to some of my models, and in the simulator, simply calling this works: setSchemaVersion(7, realmPath: Realm.defaultPath) { migration, oldSchemaVersion in if oldSchemaVersion < 7 { …
Adam Singer
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How to get parent object in Realm

Reference to realms doc I have some entities, for example it is: Category and Item. The Category contains RealmList of Items and I can access all items of category by calling getter of this list. But how can I query all items by category's id(it's…
uneven
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Realm data not saving java

I am trying to save data into a RealmListafter calling a dialog box. The dialog is supposed to take the name of the new object, a FixtureInfo, add it to the RealmList, and then move to the next activity. However after moving to the next activity and…
JJ Stamp
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Realm: Update/Set relationship without updating existing child object

Given the following data model, is there a way to update or set a child relationship without updating the (existing) child object? Data Model class Person: Object { dynamic var id = 0 dynamic var dog: Dog? override static func…
schickling
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How to avoid import cycle if I need the protocols imported?

In objective-C i made 11 classes which subclass RLMObject to represent the model of my database. And as of now I have a problem building my App with this, because as stated in the title, they seem to not see each other. Additionally: they are in the…
dfinki
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io.realm.exceptions.RealmError: Unrecoverable error. mmap() failed: Out of memory in io_realm_internal_SharedGroup.cpp line 115

I have a chat application with history cached in Realm database wrapped at RxJava operators. Everything works fine but I sometimes catch this exception on a specific set of devices: io.realm.exceptions.RealmError: Unrecoverable error. mmap()…
Gleb Eremeev
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Realm findAllSorted by field of a filed

Another question about realm. I have this structure; Class A has a class B which has a String name. I want to sort the list of Class A by B b that has a name "xy"; so this is how I tried but does not…
Ferenczi Jano
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Realm model migration strategy

I have run into a problem working with Realm migration blocks and the strategy for migrating realms. Given an object MyObject with a number of properties: In version 1 we have the property myProperty In version 2 we change the property to…
Leif Bredgaard Honorė
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java.lang.IllegalArgumentException: Category is not part of the schema for this Realm

I using Android Studio 1.2.2 and Realm 0.81.1. I have created a Model 'Category' as follows: @RealmClass public class Category extends RealmObject { private String name; // getter and setter } But I am getting …
Shivang Doshi
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Sharing Realm fields on Android

Realm on Android doesn't support model inheritance/polymorphism. So is there any way to share fields on Android? We have 5 models that all share the same synchronization-related fields and code. We use inheritance in our current SQLite models; if we…
Nolan Amy
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Open Realm Browser on Live Database in Genymotion?

I'd like to monitor a Realm database while running an Android app on Genymotion -- rather than pulling it over and over again. The most obvious possibilities would be to have the Realm database stored on external storage that's mounted to the local…
ZaBlanc
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Parsing json to a string in Gson

I have a json string: { "id":123, "name":"", "details":{} } I want to parse to this object: class Student { int id; String name; String details; } This is the error that I get: java.lang.RuntimeException: Unable to start activity…
Jimmy
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Realm or Paper for JPA in Android?

I'm developing an Android app with Android Annotations. For persistence, I firstly used a Content Provider (very complex) on top of SQLite. Then, I discovered Realm. It seemed very cool until I had to be notified for insertions to make my…
Louis CAD
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Realm Swift : Update an object inside a closure

For the sake of the question, here's a simple example (with a few shortcuts) : class Foo: Object { dynamic var id: Int = 0 [...] } class Bar: Object { dynamic var id: Int = 0 dynamic var foo: Foo? convenience required init(data:…
Sylver
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