enumerable_roles.rb

class ChangeColumnTypeForUserRole < ActiveRecord::Migration
  
  ROLES = User.roles.keys

  def up
    users = User.all
    rename_column :users, :role, :old_role
    add_column :users, :role, :integer, default: 0
    users.all.each do |u|
      u.update(role: ROLES.index(u.old_role))
    end
    remove_column :users, :old_role
  end
 
  def down
    users = User.all
    rename_column :users, :role, :old_role
    add_column :users, :role, :string
    users.all.each do |u|
      u.update(role: ROLES[u.old_role])
    end
    remove_column :users, :old_role
  end

end