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Databases & messaging · #realm
I am integrating the Realm Kotlin SDK into an Android application where each release may bump the Realm schema version and run a Migration callback that adds or transforms fields. The documented behavior is that once the local .realm file is migrated to the higher version, the change is one-way: shipping a hotfix that reverts the schema version in code cause
We need to paginate a Hibernate query that joins a parent entity to a large child collection, returning pages of roughly fifty parents. The dataset is deep enough that later pages must avoid excessive row scanning, yet the mapping cannot be changed to a unidirectional association without losing the existing object graph. Offset-based pagination using setFirs
Realm Date Persistence and UI Timezone Display The goal is to decide whether Realm should persist an explicit timezone identifier together with the UTC instant so that applications can reconstruct the original local time without performing manual conversion on read. Constraints include maintaining backward compatibility with existing Realms, keeping storage
When a write operation fails inside Realm.executeTransaction(), the transaction is rolled back and the method returns false, allowing the caller to retry the same intent. Because Realm uses MVCC, readers see a consistent snapshot and committed changes are invisible until the transaction succeeds. The goal is to confirm that a retry does not create duplicate
Integrating Realm Java with an asynchronous threading model requires managing the boundary between thread-confined live objects and thread-safe frozen objects. While frozen objects allow read access across different threads without triggering an IllegalStateException , they represent a snapshot of the data at a specific point in time. The challenge arises wh
Goal: confirm whether an existing Realm Database file can be opened after a required non-nullable property is added to an object model without supplying a default value and without defining an explicit migration block. Realm tracks an internal schema version, and documentation indicates migration blocks are required for changes beyond purely additive updates
Data Migration and SDK Coexistence When transitioning an Android application from the Realm Java SDK (io.realm) to the Realm Kotlin Multiplatform SDK (io.realm.kotlin), there is a critical boundary regarding the underlying storage engine. While both SDKs target the same general data model concepts, they bundle different versions of the Realm Core engine. Cur
In Realm Java/Kotlin, the RealmConfiguration relies on the schemaVersion to determine if the on-disk database structure matches the current object models. When the version in the Realm file exceeds the version defined in the configuration, the system prevents access to avoid data corruption. A specific challenge arises in environments where different applica
Goal Decide whether offset-and-limit slicing on Realm live Results can serve as stable deep pagination for a large dataset, or whether the application must manage an ordering key and re-query from a known anchor. Constraints Realm Results are live, auto-updating collections rather than static snapshots. Objects inserted or deleted before the offset change in
android
kotlin
hibernate