Hi,
I have a slight problem with map mappings.
public class Item extends BusinessDomainObject {
private Map<Attribute, Value> values = new HashMap<Attribute, Value>();
@OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
public Map<Attribute, Value> getValues() { return values; }
}
and:
public abstract class Value extends DomainObject {
private Attribute attribute;
private Item item;
@ManyToOne(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
public Attribute getAttribute() { return attribute; }
@ManyToOne(optional = false)
public Item getItem() { return item; }
This all works quite fine. However when I put a new values into the map,
without checking for old ones. I get duplicated assignments in my join.
The map table is filled correctly but I would like the map to be in
synch with the Value table. Means: it should remove the values that are
assossiated with a given Item over the attribute map.
So what happens now is:
item.getValues().put(a1, v1);
store(item);
then i do:
item.getValues().put(a1, v2);
I would like v1 to be removed from the database automagically. Otherwise
I would need to fetch the old values and update those all the time.
Which is a bit of a hazzle.
Is that possible?
/Andreas
