ash_hq/priv/repo/migrations/20221103061339_migrate_resources31.exs

defmodule AshHq.Repo.Migrations.MigrateResources31 do
  @moduledoc """
  Updates resources based on their most recent snapshots.

  This file was autogenerated with `mix ash_postgres.generate_migrations`
  """

  use Ecto.Migration

  import Ecto.Query

  def up do
    alter table(:guides) do
      add(:sanitized_name, :text, null: true)
    end

    flush()

    query =
      from row in "guides",
        update: [
          set: [
            sanitized_name:
              fragment(
                "(string_to_array(?, '/'))[array_upper(string_to_array(?, '/'), 1)]",
                row.route,
                row.route
              )
          ]
        ]

    AshHq.Repo.update_all(query, [])

    alter table(:guides) do
      modify(:sanitized_name, :text, null: false)
    end
  end

  def down do
    alter table(:guides) do
      remove(:sanitized_name)
    end
  end
end