How to upsert associations?

[hrdwdmrbl]

Example where there is a uniqueness constraint on Children's names

parent = Parent.new
parent.children.build(name: "Ken")
parent.save!

When the parent saves, it will auto-save the child. How can I upsert the child?

[hrdwdmrbl]

A possible solution is to intercept the save method

def save(*args)
  upsert(*args)
end

This seems to work in my testing but it makes me very nervous!