Thanks Simon. While this seems to have worked, I only run into the next 
error. Mind you, I’m somewhat new to Alchemy and my SQL is rather rusty at 
the moment. My current approach

    managed_teams = relationship("Team",                                   
                         
                                 secondary="join(user_team_association, 
user_team_association.c.is_manager==true)",
                                 backref="managers")                       
                         

seems to be an incomplete join. I’ll look into this tomorrow…
Jens


On Thursday, June 15, 2017 at 6:25:00 PM UTC+10, Simon King wrote:
>
> Table objects put columns under the ".c" attribute, so you probably 
> need "user_team_association.c.is_manager". 
>
> Simon 
>
>

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