db/migrate/20170105224407_add_shortcode_to_media_attachments.rb


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class AddShortcodeToMediaAttachments < ActiveRecord::Migration[5.0]
  def up
    add_column :media_attachments, :shortcode, :string, null: true, default: nil
    add_index :media_attachments, :shortcode, unique: true

    # Migrate old links
    MediaAttachment.local.update_all('shortcode = id')
  end

  def down
  	remove_index :media_attachments, :shortcode
  	remove_column :media_attachments, :shortcode
  end
end