vaildate_models.rake

namespace :validate do
  desc "Validates all model records"
  
  task :models => :environment do
    Dir.glob(Rails.root.to_s + '/app/models/*.rb').each { |file| require file }
    objects = ObjectSpace.each_object(Class) do |klass| 
      if ActiveRecord::Base > klass
        begin
          all_records = klass.all
        rescue
          puts "Error querying model #{klass} - maybe the table doesn't exist?"
          next
        end
        all_records.each do |r|
          if !r.valid?
            puts "Invalid record in model #{klass} with id #{r.id}!"
          end
        end
      end
    end
  end
end