I've got the following class structure:
class Aggregate{
int id;
string name;
IList<ItemBase> Items {get; set;}
}
abstract class ItemBase {}
class Item1 : ItemBase {
decimal value;
string key;
}
class Item2 : ItemBase{
int range;
DateTime time;
}
... // total of 5 item types
My DB schema (legacy, no changes possible) is as follows:
id,
name,
-- Item1 fields
value,
key,
-- Item2 fields
range,
time,
... // other columns to hold values for the rest of item types
So, now I have to be able to load this Aggregate with items as a part
of a list. There is finite number of "items" in the schema (5) and
the only way to map it that I came up with so far is to have something
like this:
class Aggregate{
private Item1 _item1{
set {
Items.Add(value);
}
}
int id;
string name;
IList<ItemBase> Items {get; set;}
}
And I map this via <component> mapping:
<component name="_item1" class="Item1">
<property name="value" .../>
<property name="key" ... />
</component>
This works for loading only, but it is ugly and definitely not how I
should approach this problem - it pollutes my domain entities with
totally artificial constructs. Even more - when columns for a
particular Item are all NULL I shouldn't add it to the list (I can do
that using this hack approach I've got now).
I would really appreciate if anyone could point me in the right
direction.
Thanks a lot!
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