I am trying to build a tree of objects that won't be persisted until a 
later date. I can't use the `add_*` methods because they require the parent 
object to be persisted prior to calling them. Is there a way in sequel to 
link a bunch of unpersisted objects together and persist the whole graph at 
some later time? For example:

```
class Author
  one_to_many :books
end

class Book
  many_to_one :author
end

author = Author.new # build an author
author.books << Book.new # add a new unsaved book
author.books << Book.new # add a new unsaved book
author.save # save the author and the books
```

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