Rake task to look for all invalid ActiveRecord records in a Rails application

invalid_records.rake

namespace :db do
  namespace :data do
    desc "Find all invalid ActiveRecord records"
    task :invalid_records => :environment do
      models = Object.subclasses_of(ActiveRecord::Base)
      models.each do |model|
        begin
          model.all.each do |record|
            if !record.valid?
              puts "#{model} #{record.id} is invalid: #{record.errors.full_messages.to_sentence}"
            end
          end
        rescue Exception => e
          puts "Error checking class #{model} (#{e})"
        end
      end
    end
  end
end