Question

I have two tables, foo and bar, and I want foo.bar_id to link to bar. The catch is that this is a one-way one-to-one relationship. bar must not know anything about foo. For every foo, there will be one and only one bar.

Ideally, after selecting a foo, I could do something like this:

myfoo.bar.whatever = 5 

How to accomplish this?

Answer 1

If you want a true one-to-one relationship, you also have to use the “uselist=False” in your relationship definition.

bar_id = Column(Integer, ForeignKey(Bar.id))
bar = relationship(Bar, uselist=False)