protected TypedQuery<UserGroupMembershipEntity> getUserGroupMappingQuery(GroupModel group) {
TypedQuery<UserGroupMembershipEntity> query =
em.createNamedQuery("userMemberOf", UserGroupMembershipEntity.class);
query.setParameter("user", getEntity());
query.setParameter("groupId", group.getId());
return query;
}
@Override
public void joinGroup(GroupModel group) {
if (isMemberOf(group)) return;
UserGroupMembershipEntity entity = new UserGroupMembershipEntity();
entity.setUser(getEntity());
entity.setGroupId(group.getId());
em.persist(entity);
em.flush();
em.detach(entity);
}