Re: Mapping fake FKs as relationships?

From: Andrus Adamchik (andru..bjectstyle.org)
Date: Sun Jan 10 2010 - 09:35:02 EST

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    Not directly, but you can emulate that with entity qualifiers by
    filtering the generic entity on the value of the column that is not
    participating in a join. You can even map that as an inheritance
    hierarchy.

    Andrus

    On Jan 10, 2010, at 4:05 PM, George Stan wrote:
    > Hi,
    >
    > Is it possible to map fake foreign keys with CM?
    >
    > In many DBs for webapps there seem to be quite a few tables (for
    > entities like Tags, Comments, Attachments, Events) to have
    > relationships to many other tables, and instead of a FK, a
    > combination of two fields is used (target_table_name and
    > target_row_id).
    >
    > I know that other ORMs (like ActiveRecord from RoR) have this
    > feature, but I'm not sure about Cayenne.
    >
    > Thanks in advance,
    >
    > George.

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