class MakeGroupOrderKeyNullable < ActiveRecord::Migration[7.0]
  def change
    # Make column nullable (safe even if already is)
    change_column_null :group_orders, :multi_group_order_id, true

    # Remove old FK if it exists (avoid name conflict)
    remove_foreign_key :group_orders, column: :multi_group_order_id

    # Re-add with ON DELETE SET NULL
    add_foreign_key :group_orders, :multi_group_orders, column: :multi_group_order_id, on_delete: :nullify
  end
end