oshipka/vm_gen/templates/_relationship_py

    [%- if not column.secondary %]
    [[ column.name ]]_id = db.Column(db.Integer, db.ForeignKey('[%- if column.to %][[ column.to|camel_to_snake ]][%- else %][[ column.name ]][% endif %].id'))
    [%- endif %]
    [[ column.name|pluralize if column.secondary else column.name ]] = db.relationship('[%- if column.to %][[ column.to ]][%- else %][[ column.name|snake_to_camel ]][% endif %]',
                                        [%- if column.secondary %]secondary=[[ column.secondary ]], [%- endif %]
                                        backref=db.backref("[%- if column.backref %][[ column.backref ]][%- else %][[ name|camel_to_snake|pluralize ]][%- endif %]"),
                                        [%- if column.foreign_keys %]foreign_keys=[ [[ column.foreign_keys ]]_id],[%- endif %]
                                        )