db/migrate/20110803223524_acts_as_taggable_on_migration.rb


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class ActsAsTaggableOnMigration < ActiveRecord::Migration
  def up
    create_table :tags do |t|
      t.string :name
    end unless table_exists?(:tags)

    unless table_exists?(:taggings)
      create_table :taggings do |t|
        t.references :tag

        # You should make sure that the column created is
        # long enough to store the required class names.
        t.references :taggable, :polymorphic => true
        t.references :tagger, :polymorphic => true

        t.string :context

        t.datetime :created_at
      end

      add_index :taggings, :tag_id
      add_index :taggings, [:taggable_id, :taggable_type, :context]
    end
  end

  def down
    drop_table :taggings
    drop_table :tags
  end
end