Ecto.multi with insert and insert_all?

Yeah you can using Multi.merge/2 (or Multi.run). It looks something like this:

Multi.new()
|> Multi.insert(:user, User.changeset(%User{}, params))
|> Multi.merge(fn %{user: user} ->
  # That is the inserted user from the first part of the multi
  Multi.new()
  |> Multi.insert_all(:posts, build_insert_all_posts_changeset(user))
end)
|> Repo.transaction()

What is this function??

It is a function that you would need to define that returns a list of post changesets (and is suitable for insert_all so it might have to set inserted_at and updated_at).

How can you use insert_all with a list of changeset?

You can’t directly. Repo.*_all are lower level APIs, which don’t support many schema or changeset features. You can map things from changeset to values for insert_all manually if you don’t need any of the not really supported parts.

Thanks for the clarification.

So, is there any example on how to insert a bunch of “children” in a Multi with validation?

Will open a new thread though. Don’t want to necrobump.