session is designed to handle this. Add a property that leverages the
foreign key you defined. Then let session do the work.

http://www.sqlalchemy.org/docs/orm/tutorial.html#building-a-relationship


class ModelAttribute(Base):
    __tablename__ ='model_attribute'
    id =  Column(Integer,primary_key=True)
    confirmed = Column(Boolean,default=False, nullable=False)
    values = relationship(ModelAttributeValue)

attr = ModelAttribute(confirmed=True)
attr.values.append(ModelAttributeValue(value=1))

session.add(attr)
session.commit()

-- 
Mike Conley

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