Many to many and upserts « Plataformatec BlogNote: This is a sample chapter of the upcoming beta version of our “What’s new in Ecto 2.0” free book. Reserve Download your copy now if you want to receive the next beta and be notified of future versions. In the previous chapter we have learned about many_to_many associations and how to map external data to associated entries with the help of Ecto.Changeset.cast_assoc/3. While in the previous ch
