class AddAttachableJournal < ActiveRecord::Migration
  def change
    create_table :attachable_journals, id: false do |t|
      t.integer :journal_id, null: false
      t.integer :attachment_id, null: false
      t.string  :filename, :default => '', :null => false
    end

    add_index :attachable_journals, :journal_id
    add_index :attachable_journals, [:journal_id, :attachment_id], unqiue: true
  end
end