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class ActsAsTaggableOnMigration < ActiveRecord::Migration

  def self.up

    create_table :tags do |t|

      t.column :name, :string

    end

    create_table :taggings do |t|

      t.column :tag_id, :integer

      t.column :taggable_id, :integer

      t.column :tagger_id, :integer

      t.column :tagger_type, :string

      # You should make sure that the column created is

      # long enough to store the required class names.

      t.column :taggable_type, :string

      t.column :context, :string

      t.column :created_at, :datetime

    end

    add_index :taggings, :tag_id

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

  end

  def self.down

    drop_table :taggings

    drop_table :tags

  end

end