I have a model containing Transactions and Splits. The splits are children of transactions. I’m trying to first insert a new transaction, pick-up the freshly generated transaction.uuid, and use that value to insert into the child row to be created in the next step. I’m having trouble finding a way to reference the fresh minted uuid from the first step in the insert on child. What would be considered a good way to handle this? Thanks.

test "SPLIT inserts via Ecto.Multi style transaction." do
      multi =
        Ecto.Multi.new()
        |> Ecto.Multi.insert(:transaction, create_transaction(transaction_map()))
        |> Ecto.Multi.insert(:split, create_split(split_map(:transaction)))

      case Repo.transaction(multi) do
        {:ok, _results} ->
          IO.puts("Success")

        {:error, :transaction, changeset, _changes} ->
          IO.inspect(changeset.errors, label: "Transaction insert failed.")

        {:error, :split, changeset, _changes} ->
          IO.inspect(changeset.errors, label: "split insert failed.")
      end
end