Question

I have some code in my Item model (very loosely) like such:

def author_id=(xyz) 
  book = Book.find_by_author_id(xyz)
  book.author_id = self.id
end

self.id doesn’t seem to be set though, when creating a new record…Any ideas?

Answer 1

id is set to record only after it is saved to database. So you could add a simple callback here

after_create (or after_save - whatever you need) do |record|
  book = Book.find_by_author_id(xyz)
  book.update_attributes :author_id => record.id
end