On 6/03/11 9:03 PM, Bruno René Santos wrote:
I have an object structure with a Child dataobject which inherits from a Parent
which is linked to a db_entity. I am trying to use the Parent on a GUI and the
Child on another GUI. The Child overrides some methods from the Parent (but the
db table is the same) and so is mandatory that on each GUI their respective
searches yeld Child objects or Parent objects. On the GUI that uses the Child
everything goes according plan, the performQueries return lists of Children.
But on the Parent GUI I call
context.performQuery(new SelectQuery(Parent.class))
but the method returns also a list of Children, which are incompatible with the
parent GUI. Is there any way that this query returns Parents instead of
Children? I was trying these inheritance so that i could reuse all db fields
and relationships from the parent on the child.
What does the discriminator column say about these objects? Are they actually
Child entities in the database or Parent? They can't be both at the same time.
This isn't like plain-old Java inheritance where you can just cast from one to
the other as needed. If you could, what would happen if you queried for a list
of Child objects, casting them as Parents, changed some Parent attribute and
committed the context? Would they now become Parents in the database?
Ari
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Aristedes Maniatis
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