spring-data-mongodb entity implementing an interface create wrong collections

Question

I want to allow user to choose their own persistence technologies, and to do so developers must write entities that implements given interface.

By default application use spring-data with mongodb, the following are extract code from entity:

@Document(collection="event_handlers")
@CompoundIndexes({
  @CompoundIndex(name = "handlers_unique_idx", def = "{'eventName': 1, 'className': 1}", unique=true, sparse=true)
})
public class HandlerImpl implements Handler {
  ....
}

and its related repository:

@Repository
public interface HandlerRepository extends MongoRepository<Handler, String> {
...
}

Running integration test, I’ve noticed that application write entity in an unexpected collections, named handler, as the entity interface, and not in the expected collection, name event_handlers, and besides, the composite key doesn't work because it has been associated with the right collection that remain all time empty.

That's the collection list for my db:

> show collections
event_handlers
handler
system.indexes
>

How can I use spring-data to use this kind of configuration?

Thanx

Oliver Drotbohm · Accepted Answer · 2014-06-27 12:00:13Z

1

The collection objects are stored in is determined from the domain type you configure the repository with. Thus you should see this working as expected if you annotate Handler with @Document.

This works as it works to allow people storing objects of a type hierarchy in a single collection to allow polymorphic queries. If you don't need that, the way to go is a repository interface per concrete domain type.

answered Jun 27, 2014 at 12:00

Oliver Drotbohm

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