norm

20130807222326_make_normalized_net_interface_data_usages_polymorphic.rb

class MakeNormalizedNetInterfaceDataUsagesPolymorphic < ActiveRecord::Migration
  def up
    rename_column :normalized_net_interface_data_usages, :net_interface_id, :measurable_data_id
    add_column    :normalized_net_interface_data_usages, :measurable_data_type, :string
    
    change_table :net_interfaces do |t|
      t.references :measurable_data, polymorphic: true
    end
    
    change_table :router_configs do |t|
      t.references :measurable_data, polymorphic: true
    end

    change_table :accounts do |t|
      t.references :measurable_data, polymorphic: true
    end

    rename_table :normalized_net_interface_data_usages, :normalized_data_usages
  end

  def down
    change_table :net_interfaces do |t|
      t.remove_references :measurable_data, polymorphic: true
    end
    
    change_table :router_configs do |t|
      t.remove_references :measurable_data, polymorphic: true
    end

    change_table :accounts do |t|
      t.remove_references :measurable_data, polymorphic: true
    end

    remove_column    :normalized_net_interface_data_usages, :measurable_data_type
    rename_table :normalized_data_usages, :normalized_net_interface_data_usages
  end
end