class CommentableOnMigration < ActiveRecord::Migration<%= migration_version %>
  def self.up
    create_table :comments do |t|
      t.references :commentable, polymorphic: true
      t.references :commenter, polymorphic: true
      t.text :body
      t.string :thread

      t.timestamps
    end

    add_index :comments, :thread
    add_index :comments, [:commenter_id, :commenter_type]
    add_index :comments, [:commentable_id, :commentable_type]
  end

  def self.down
    drop_table :comments
  end
end