def attach_to_parent_draft(parent_draft, relation)
        if parent_draft && relation
          draft.parent = parent_draft
          draft.parent_association_name = relation
        end
      end
def attach_to_parent_draft(parent_draft, relation)
        if parent_draft && relation
          draft.parent = parent_draft
          draft.parent_association_name = relation
        end
      end
Attach the draft object to a parent draft object, if there is one.
 The parent_draft may be for an Article which has_many :comments,
 as an example.

 @param [Draft] parent_draft the draft that this draft is associated with.
 @param [Symbol] relation the name of the has_many (or has_one) association.