On 5/25/06, Guillermo Roditi <[EMAIL PROTECTED]> wrote:
I am building a TODO manager, and I am having trouble grasping how i should
handle dependency relations within todo objects. here's a simplified layout
To_Dos
Fields: id (PK), title, due_date
To_Do_Dependencies
Fields: dependent_id (FK To_Dos.id), dependee_id (FK To_Dos.id)
PK: dependent_id, dependee_id
[...]
So this is a many to many, but i can't wrap my head around how to specify
this in RDBO
There was a recent example of how to set this up posted to the mailing list:
http://sourceforge.net/mailarchive/message.php?msg_id=15698216
Previously, there was a bug that prevented it from working correctly,
but that's since been fixed. Basically, it's just a regular
many-to-many relationship that happens to have the same class on both
"ends" of the relationship. That means that you need to explicitly
specify map_from and map_to values (they'd be correctly guessed by
RDBO if they pointed to different classes instead of the same class)
but otherwise it's nothing special.
-John
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