I don't think you could do all of this with the standard 
nested_attributes on the book model, you'd need to write your own setter 
method.  Ultimately you're going to be creating an authoring_role 
object, and either finding an existing author or creating a new author, 
and the same for the role.  So, if the authoring_role model has 
nested_attributes that let you set role and author data, then you could 
call that when you create it.  I've not done much with nested_attributes 
myself though.
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