ecto-wtf.halp.ex

# lib./my_app/entries.ex
defmodule MyApp.Entries do
  alias MyApp.Entry

  # Aqui, eu espero erros serem retornados (como tuplas)
  # ao invés de serem lançados (com throw, etc.)
  def create_entry(attrs \\ %{}) do
    %Entry{}
    |> Entry.changeset(attrs)
    |> Repo.insert()
  end
end

# lib./my_app/entries/entry.ex
defmodule MyApp.Entry do
  use Ecto.Schema
  import Ecto.Changeset
  alias MyApp.Address

  schema "entries" do
    embeds_one(:address, Address, on_replace: :update)
    field(:notes, :string)
    timestamps(type: :utc_datetime)
  end

  def changeset(entry, attrs) do
    entry
    |> cast(attrs, [:notes])
    |> cast_embed(:address)
    |> validate_required([:address])
  end
end