Mapping in TopLink workbench: Sorting order for one-to-one mapping field

Hi,
we have a requirement; though it is one-to-many relationship, we wanted to map it as one-to-one, so that we get latest of the mappped entity based on attribute:*noOfVisits*. For this, I am trying to make descending order by noOfVisists in workbench; but no provision there.. it is available only for one-to-many relationship;
If I map as one-to-many, I can specify the sorting order; but is there any option to limit the max rows of it to *1*.
Pls suggest the solution; I am trying to avoid to write named query for this; and wanted to get from the entity itself by navigating to one-to-one relationship entity.
Thanks,
Dhana kumar.

Hello,
If you want strictly JPA options, I'd either not map it and query for it (which you can then store it in the object if you want in a transient attribute), or map it as 1:M with the order by and have a getSingleVistedChild type method that returns the first element if its noOfVisits value is 1.
Mapping it using the 1:1 as you are asking can be done. All that is required is that you add selection criteria for the query used in the mapping as described here:
http://wiki.eclipse.org/EclipseLink/Examples/JPA/MappingSelectionCriteria
Best Regards,
Chris

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