I believe something like this should work.
conversations = sqlalchemy.orm.relationship("Conversation",
primaryjoin=
"""or_(User.id==Conversation.user_id_1,
User.id==Conversation.user_id_2,
)""",
order_by=
"Conversation.id.desc()",
)
i also think you'll need to make an explicit relationship for a user1 and
user2 relationship instead of using back_populates. i could be wrong.
personally i would make separate relationships though, because having an
undordered list for them makes little sense.
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