Programming Ecto

Running Transactions with Ecto.Multi

The other way to use Repo.transaction is pass in an Ecto.Multi struct, rather than a function. Ecto.Multi allows you to group your database operations into a data structure. When handed to the transaction function, the Multi’s operations run in order, and if any of them fail, all of the others are rolled back.

Let’s take a look at an earlier example where we ran a transaction with an anonymous function:

priv/examples/transactions_05.exs

artist = %Artist{name: "Johnny Hodges"}
Repo.transaction(fn ->
  Repo.insert!(artist)
  Repo.insert!(Log.changeset_for_insert(artist))
end)

Here’s how we can rewrite it using Multi:

alias Ecto.Multi

artist = %Artist{name: ...