nairobi/db/migrate/20190321144328_add_config_to_download_settings.rb

class AddConfigToDownloadSettings < ActiveRecord::Migration[4.2]
  def change
    add_column :download_settings, :config, :integer, default: 0, null: false

    remove_index :download_settings, column: [:name_model, :name_field]
    add_index :download_settings, [:name_model, :name_field, :config], unique: true
  end
end