code: protected boolean isUnidirectionalOneToMany(PersistentProperty property) {
          return ((property instanceof org.grails.datastore.mapping.model.types.OneToMany) && !((Association)property).isBidirectional());
      }
docs: Checks whether a property is a unidirectional non-circular one-to-many
  
  @param property The property to check
  @return true if it is unidirectional and a one-to-many