impressionist/upgrade_migrations/version_0_3_0.rb

class CreateImpressionsTable < ActiveRecord::Migration
  def self.up
    add_column :impressions, :session_hash, :string
    remove_index :impressions, :name => :poly_index
    remove_index :impressions, :name => :controlleraction_index
    add_index :impressions, [:impressionable_type, :impressionable_id, :request_hash], :name => "poly_request_index", :unique => false
    add_index :impressions, [:impressionable_type, :impressionable_id, :ip_address], :name => "poly_ip_index", :unique => false
    add_index :impressions, [:impressionable_type, :impressionable_id, :session_hash], :name => "poly_session_index", :unique => false
    add_index :impressions, [:controller_name,:action_name,:request_hash], :name => "controlleraction_request_index", :unique => false
    add_index :impressions, [:controller_name,:action_name,:ip_address], :name => "controlleraction_ip_index", :unique => false
    add_index :impressions, [:controller_name,:action_name,:session_hash], :name => "controlleraction_session_index", :unique => false

  end

  def self.down
    remove_column :impressions, :session_hash
    remove_index :impressions, :name => :poly_request_index
    remove_index :impressions, :name => :poly_ip_index
    remove_index :impressions, :name => :poly_session_index
    remove_index :impressions, :name => :controlleraction_request_index
    remove_index :impressions, :name => :controlleraction_ip_index
    remove_index :impressions, :name => :controlleraction_session_index
    remove_index :impressions, :user_id
    add_index :impressions, [:impressionable_type, :impressionable_id, :request_hash, :ip_address], :name => "poly_index", :unique => false
    add_index :impressions, [:controller_name,:action_name,:request_hash,:ip_address], :name => "controlleraction_index", :unique => false
  end
end