Hello, not sure if i got you right, but here is what i think.

> users_projects=Table('users_projects', metadata,
>     Column('id_users', Integer, ForeignKey('users.id_users')),
>     Column('id_projects', Integer, ForeignKey('projects.id_projects')),
>     )
>   
> users_projects.create()
> 
> class Users(object):
>       pass
> class Projects(object):
>       pass        
> 
> umapper=mapper(Users, users)

umapper = mapper(Users, users, properties = dict(
        projects = relation(Projects, secondary = users_projects),
        ))

> pmapper=mapper(Projects, projects, properties={
>     'users' : relation(Users, secondary=users_projects,
> backref="projects"), }
>     )



> 
> u=session.query(Users).select()
> 
> for i in range(len(u)):
>     pr=u[i].fk_project.split(',')
>     for p in range(len(pr)-1):
>         
> pname=session.query(Projects).selectfirst(projects.c.id_projects==pr[p])
>       ????????

all_usuers = session.query(Users).select()

for user in all_users:
    project_ids = user.fk_project.split(',')
    for project_id in project_ids:
        project = session.get(Projects, project_id)
        user.projects.append(project)

session.flush()


> Actually, the users table has a fk_project field like 1,15,3,. Each
Now dismiss the fk_project field altogether, you do not need it with
many-to-many relationships.

-- 
Cheers, Sol.

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