defmodule Zoeyscomputer.Repo.Migrations.ChangeGistsId do
  alias Ecto.Repo
  alias Zoeyscomputer.IdGenerator
  use Ecto.Migration

  import Ecto.Query, only: [from: 2]

  def change do
    alter table(:gists) do
      add(:new_id, :string)
    end

    flush()

    execute """
    UPDATE gists SET new_id = substring(md5(random()::text), 0, 8)
    """

    alter table(:gists) do
      remove(:id)
      modify(:new_id, :string, primary_key: true)
    end

    rename(table(:gists), :new_id, to: :id)
  end
end