im pretty sure we've had this pattern before (didnt check tho).  you should be able to do a mostly-normal mapping setup, but you will need to explicitly specify the primaryjoin and secondaryjoin conditions.

On Aug 17, 2006, at 7:17 AM, Michael Carter wrote:

Hello,
I was having some trouble with mapping the following two tables:

users = Table('users', meta,
    Column('id', Integer, primary_key = True),
    Column('user_name', String(16) ))    
    
friendship = Table('friendship', meta,
    Column('user_id', Integer, ForeignKey('users.id'), primary_key=True),
    Column('friend_id', Integer, ForeignKey('users.id'), primary_key=True))


Whether or not a particular user id appears in the user_id column or friend_id column, I want that row to count in the relation.

so:
>>> user1.friends.append(user2)
>>> user1.friends
[ <User: 2> ]
>>> user2.friends
[ <User: 1>]

friendship table:
-----------------------
| user_id | friend_id |
-----------------------
|       1 |         2 |
-----------------------

Thanks,
Michael Carter
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