Update all model`s counters

reset_counters.rake

# -*- coding: utf-8 -*-
#
namespace :db do
  desc 'Update all model`s counters'
    task :reset_counters => :environment do
      Dir.glob(Rails.root + '/app/models/*.rb').each { |file| require file }
      models = Rails::VERSION::MAJOR >= 3 ? ActiveRecord::Base.connection.tables.map {|t| t.classify.constantize rescue nil}.compact : Object.subclasses_of(ActiveRecord::Base)

      models.each do |model|

        countables = []

        model.reflections.keys.each do |reflection|
          countables << reflection if model.attribute_names.include? "#{reflection.to_s}_count"
        end

        next if countables.empty?

        puts "#{model}: #{countables.join(', ')}"

        model.find_each do |r|
          model.reset_counters r.id, *countables
        end
      end

  end
end

# Alternative:
# https://github.com/rails/rails/blob/39d461703361834c2e51dd9179afce0f8a0a83ff/activerecord/lib/active_record/counter_cache.rb#L17