Hi,
I had a need for a new Query API operator, which works as follows: if
you have an entity with a ManyAssociation, you may want to find all
entities where the ManyAssociation contains a specific entity. In my own
case I had a UserEntity with a ManyAssociation<Organization> for the
organizations the user is a member of. Then I wanted to find all users
for a particular organization.
This can be done using the new
QueryExpressions.contains(ManyAssociation, entity) operator. I have
added a new testcase for it in RdfQueryTest, which looks like this:
QueryBuilder<Person> qb = qbf.newQueryBuilder( Person.class );
Person person = templateFor( Person.class );
Domain gaming = unitOfWork.get( Domain.class, "Gaming" );
Query<Person> query = qb.where(
contains( person.interests(), gaming)
).newQuery( unitOfWork );
System.out.println( "*** script33: " + query );
verifyUnorderedResults( query, "Joe Doe" );
---
In this case it finds all people whose interests() ManyAssociation
contains the entity with id "Gaming".
I've added this to Iterable queries as well.
/Rickard
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