In RoR, if I say that A has_one B, is it mandatory that A has one B?

Question

I need to setup a relationship so that A has one B, but there will be some entries where A doesn't have a B. Is this possible? If not, how can this be done?

Thanks for reading.

Answer 1

Yes, it is possible. By default A doesn't have to have a B unless you add code to enforce it.

Answer 2

You can check that there is a B by adding validates_presence_of :b in class A