Multiple nested collections search

Hibernate Search
2

Hey Filip,

Your question looks similar to the one discussed in this thread Searching in nested lists

Overall you want to use a nested structure on your index-embedded and a nested predicate. In particular take a look at the example from that section (it shows how to build a predicate where two fields of a nested object must match the condition for an entity to be included in the results.

The problematic part is that you need to have the map key be a part of the object representing the corresponding value. (using a value extractor for both keys and values won’t work since you’ll just end up having two collections)

So you could try to have something along the next lines instead:

AnObject{
    // don't map the map itself
    private Map<EnumKey, AnotherObject> anotherObjects;

    // have a getter instead that would return a custom object:
    @IndexedEmbedded(structure = ObjectStructure.NESTED)
    @IndexingDependency(derivedFrom = {
		@ObjectPath(@PropertyValue(propertyName = "anotherObjects"))})
    List<AnotherObjectsWrapped> getAnotherObjectsWrapped() {
    	return anotherObjects.entrySet().stream().map( AnotherObjectsWrapped::new ).collect( Collectors.toList() );
    }

}

public static class AnotherObjectsWrapped {
	@GenericField
	EnumKey enumKey;
	@IndexedEmbedded
	AnotherObject anotherObject;
	public BookEntry(Map.Entry<EnumKey,AnotherObject> entry) {
		...
	}
}