Non-primary key UUIDs in Phoenix

migration.exs

defmodule MyApp.Repo.Migrations.AddTrackerIdToProperty do
  use Ecto.Migration

  def change do
    alter table :properties do
      add :tracker_id, :uuid, default: fragment("uuid_generate_v4()")
    end
  end
end

schema.ex

defmodule MyApp.Analytics.Property do
  use Ecto.Schema

  import Ecto.Changeset

  schema "properties" do
    field :name, :string
    field :tracker_id, :binary_id, read_after_writes: true

    belongs_to :product, MyApp.Analytics.Product

    timestamps()
  end
  
  # changeset functions, etc.
end