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Realm Relation how to implement


Realm Relation how to implement

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Realm Relation how to implement
Tag : ios , By : user155548
Date : November 15 2020, 03:01 PM

hop of those help? I am working on iOS and that is saving product. and this product has some more things inside its model , Just put dynamic keyword before your property
dynamic var Product : ProductModel? = nil 

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Inverse relation in realm


Tag : development , By : Ron
Date : March 29 2020, 07:55 AM
wish of those help UPDATE (10-27-2014)
Bidirectional relationships are now supported. See Realm's docs: http://realm.io/docs/cocoa/latest#inverse-relationships
@class Box;

@interface Item : RLMObject
@property Box *box;
@end

RLM_ARRAY_TYPE(Item);

@interface Box : RLMObject
@property RLMArray<Item> *items;
@end

...

Item *item = [[Item alloc] init];
Box *box = [[Box alloc] initWithObject:@[@[item]]];
item.box = box;

Realm relation field always null


Tag : android , By : Rik
Date : March 29 2020, 07:55 AM
should help you out I was thinking my objects must not be null directly but the point is Realm uses proxy for models and the proxy is not null actually.

How to add Realm object just once to relation


Tag : ios , By : user185283
Date : March 29 2020, 07:55 AM
Hope that helps add(_:update:) with update: true and its friends take care of updating related objects as well. Make sure that those have also primary keys, otherwise you'd end up inevitable with duplicates.
Beside that, you could just check for the presence of a related object in a write transaction, after creating the root object with one of these methods. Write transactions are using a locking mechanism across all opened Realm for the same file, so you don't have to worry about simultaneously putting an object in a relationship as long as you check within the write transaction itself, whether it is not already part of it.

Going from one-to-one relation to one-to-many in Realm Swift


Tag : ios , By : Joe
Date : March 29 2020, 07:55 AM
This might help you If all of your B objects are linked to by exactly one A object, you can do the following in your migration:
migration.deleteData("B")
migration.enumerate("A") { oldObject, newObject in
    let b = migration.create("B", value: oldObject!["b"]!)
    (newObject!["bs"] as! List<MigrationObject>).append(b)
}

ios - creating a relation in Realm migration


Tag : ios , By : David
Date : March 29 2020, 07:55 AM
around this issue As I've found this github issue - https://github.com/realm/realm-cocoa/issues/1385 I assume it is not possible right now.
So my solution was to create a migration dictionary which contained information which relations should be created after the migration is performed and then create relations myself by calling realm.write { }.
var migrationDict = [Int: Int]()

let configuration = Realm.Configuration(schemaVersion: 2, migrationBlock: { (migration, oldVersion) in
    if oldVersion < 2 { 
        migration.enumerateObjects(ofType: A.className(), { (old, new) in
            if let bID = old?["bID"] as? Int, let id = old?["identifier"] as? Int {
                migrationDict[id] = bID
            }
        }
    }
})

Realm.Configuration.defaultConfiguration = configuration

let realm = try! Realm()
try! realm.write {
    migrationDict.forEach { aID, bID in
        // set the A.b relation here
    }
}
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