memEx/lib/memex/repo/migrator.ex

defmodule Memex.Repo.Migrator do
  @moduledoc """
  Genserver to automatically perform all migration on app start
  """

  use GenServer
  require Logger

  def start_link(_) do
    GenServer.start_link(__MODULE__, [], [])
  end

  def init(_) do
    migrate!()
    {:ok, nil}
  end

  def migrate! do
    path = Application.app_dir(:memex, "priv/repo/migrations")
    Ecto.Migrator.run(Memex.Repo, path, :up, all: true)
  end
end