Android Room: storing an object hierarchy and querying for the superclass

Asked Mar 22 '19 at 11:07

Active Mar 22 '19 at 11:07

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In my application there is a User superclass and Coach and Player classes that extend User. I'd like to be able to use DAO methods like these:

@Query
fun getUsers(): Flowable<List<User>>

and not have to request Coaches and Players separatly. When I try something like this now my generated implementation class is not valid because it tries to create User objects, which is an abstract class.

Is there a way for Room to attain this polymorphic behaviour? Should the User class also have an @Entity tag or not? The User has the UUID that is being used as a Primary key.

asked Mar 22 '19 at 11:07

HDW

https://commonsware.com/AndroidArch/previews/polymorphic-room-relations – ronginat Mar 22 '19 at 11:21
https://stackoverflow.com/questions/46317047/does-room-support-entity-inheritance – ronginat Mar 22 '19 at 11:22
https://stackoverflow.com/questions/44746225/reusable-generic-base-class-daos-with-android-room#answer-45578682 – ronginat Mar 22 '19 at 11:23
Just google it... – ronginat Mar 22 '19 at 11:24

Android Room: storing an object hierarchy and querying for the superclass

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