gistfile1.rb

class UpdatePetsCache < ActiveRecord::Migration
  def up
    User.all.each do |user|
      User.reset_counters user.id, :pets
    end
  end

  def down
  end
end

gistfile2.txt

[out :: ] ==  UpdatePetsCache: migrating ================================================
[out :: ]
[out :: ] rake aborted!
[out :: ]
[out :: ] An error has occurred, this and all later migrations canceled:
[out :: ]
[out :: ]
[out :: ] uninitialized constant User::Pet
[out :: ] /var/www/Test/shared/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/inheritance.rb:111:in `compute_type'

[out :: ]
[out :: ] /var/www/Test/shared/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/reflection.rb:172:in `klass'
[out :: ]
[out :: ] /var/www/Test/shared/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/counter_cache.rb:33:in `block in res
ounters'
[out :: ]
[out :: ] /var/www/Test/shared/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/counter_cache.rb:19:in `each'
[out :: ]
[out :: ] /var/www/Test/shared/bundle/ruby/1.9.1/gems/activerecord-3.2.13/lib/active_record/counter_cache.rb:19:in `reset_counte