I have a relationship that is similar to Authors and Books (Many to
Many).  So lets say I am adding the book on a web site form and I
choose from a multi-select field two authors for said book.  From my
web environment, all I get is a list like [1,2] where 1 and 2 are the
ids of the authors the user picked.

1) What is the best way to update my book to have the correct authors
(keep in mind this has to work if we are adding the book or editing
it)
2) When preparing to edit a book, what is the best way to get a list
of author ids from books, so that I can use them to populate the
authors form field?

Thanks!
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