Can you provide an example on how to properly index fields in the (automagically generated) "join" table that rails creates when 2 models are declared as habtm?

For example:
class Role < ActiveRecord::Base

has_and_belongs_to_many :users

end

class User < ActiveRecord::Base

has_and_belongs_to_many :roles

end

Then, how do I properly index the "role_id" and "user_id" columns in the automatically generated "roles_users" table?

It seems that cache-money requires index declarations in all models, but the problem is, there's no actual model file declared for the "roles_users" table. So, do I need to manually create the model file...? Or is there some other way to accomplish what I want?

Thanks.

I feel cache_money is great, especially for its support of transaction. I haven't seen any others provide such feature.
However, I need to use rails as the backend of a Flex project, and use rubyamf (http://code.google.com/p/rubyamf/) to communicate with the front side. When an ActiveRecord (e.g. User) is configured with class mapping:

  ClassMappings.register(
  :actionscript => 'model.UserModel',
  :ruby => 'User',
  :type => 'active_record',
  :attributes => ["id", "name"],
  :associations  =>{ :for_default=>[] })

User.find 1 reports some error:
NoMethodError: You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.indices

from (__DELEGATION__):2:in `__send__'
from (__DELEGATION__):2:in `indices'
from (__DELEGATION__):2:in `__send__'
from (__DELEGATION__):2:in `indices'
from /home/clive/ruby/RailsApplication1/vendor/plugins/nkallen-cache-money/lib/cash/query/abstract.rb:114:in `indexed_on?'
from /home/clive/ruby/RailsApplication1/vendor/plugins/nkallen-cache-money/lib/cash/query/abstract.rb:56:in `cacheable?'
from /home/clive/ruby/RailsApplication1/vendor/plugins/nkallen-cache-money/lib/cash/query/abstract.rb:15:in `perform'
from /home/clive/ruby/RailsApplication1/vendor/plugins/nkallen-cache-money/lib/cash/query/primary_key.rb:17:in `perform'
from /home/clive/ruby/RailsApplication1/vendor/plugins/nkallen-cache-money/lib/cash/query/abstract.rb:7:in `perform'
from /home/clive/ruby/RailsApplication1/vendor/plugins/nkallen-cache-money/lib/cash/finders.rb:29:in `find_from_ids'
from /home/clive/ruby/RailsApplication1/vendor/rails/activerecord/lib/active_record/base.rb:590:in `find'
from (irb):1

and index [:name] in User class also reports:
home/clive/ruby/RailsApplication1/vendor/rails/activerecord/lib/active_record/base.rb:1833:in method_missing':NoMethodError: undefined methodindex' for #<Class:0xb730f374>

I couldn't find a way to attach the rails project I created here. If some one has problem in reproduce the issue, feel free to contact me

Hi Nick,
Occasionally, I get the following "Cash::Lock::Error" and was wondering if you could shed some light as to whether cache-money or memcached generated the underlying issue:

... /var/lib/gems/1.8/gems/memcached-0.14/lib/memcached/memcached.rb:389:in `check_return_code': Key {"lock/Url:7/client_id/19799"=>"172.16.164.42:11211:8"} Cash::Lock::Error

If it's an error that's ultimately generated by memcached, I assume there's no way to fix it at any other level (e.g., in rails). Is that a fair assessment?

Thanks,
-- Darien

I am on ruby 1.8.7 , Rails 2.3.2 , cache-money 0.2.5

This works

Location.new(:lat => 12.1, :lng => 12.2)

, lng: #<BigDecimal:3e33df4,'0.122E2',8(8)>, address: nil, city: nil, state: nil, country: nil, pincode: nil, created_at: nil, updated_at: nil>

This fails

Location.create(:lat => 12.1, :lng => 12.2)

ArgumentError: wrong number of arguments (4 for 2)

from /vendor/gems/nkallen-cache-money-0.2.5/lib/cash/buffered.rb:123:in `set'
from /vendor/gems/nkallen-cache-money-0.2.5/lib/cash/buffered.rb:123:in `send'
from /vendor/gems/nkallen-cache-money-0.2.5/lib/cash/buffered.rb:123:in `call'
from /vendor/gems/nkallen-cache-money-0.2.5/lib/cash/buffered.rb:94:in `perform_commands'
from /vendor/gems/nkallen-cache-money-0.2.5/lib/cash/buffered.rb:93:in `each'
from /vendor/gems/nkallen-cache-money-0.2.5/lib/cash/buffered.rb:93:in `perform_commands'
from /vendor/gems/nkallen-cache-money-0.2.5/lib/cash/buffered.rb:75:in `flush'
from /vendor/gems/nkallen-cache-money-0.2.5/lib/cash/transactional.rb:19:in `transaction'
from /vendor/gems/nkallen-cache-money-0.2.5/lib/cache_money.rb:50:in `transaction'
from /vendor/rails/activerecord/lib/active_record/transactions.rb:228:in `with_transaction_returning_status'
from /vendor/rails/activerecord/lib/active_record/transactions.rb:196:in `save'
from /vendor/rails/activerecord/lib/active_record/transactions.rb:208:in `rollback_active_record_state!'
from /vendor/rails/activerecord/lib/active_record/transactions.rb:196:in `save'
from /vendor/rails/activerecord/lib/active_record/base.rb:728:in `create'
from (irb):1

Help with this...

?> x = Package.find_by_name "Platinum Pack"
  SQL (0.1ms)   SET SQL_AUTO_IS_NULL=0
  Package Columns (1.2ms)   SHOW FIELDS FROM `packages`
  Package Load (0.2ms)   SELECT * FROM `packages` WHERE (`packages`.`name` = 'Platinum Pack') LIMIT 1
=> #
>> x.send :all_package_ids
  AssociatedPackage Columns (1.1ms)   SHOW FIELDS FROM `associated_packages`
  AssociatedPackage Load (0.2ms)   SELECT * FROM `associated_packages` WHERE (`associated_packages`.`id` = 7) AND (`associated_packages`.package_id = 21) 
=> [21, 20, 19]
>> x.send :all_package_ids

SystemStackError: stack level too deep
    from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.3/lib/active_support/core_ext/hash/except.rb:18:in `except!'
    from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.3/lib/active_support/core_ext/hash/except.rb:13:in `except'
    from /opt/local/lib/ruby/gems/1.8/gems/nkallen-cache-money-0.2.5/lib/cash/query/abstract.rb:78:in `safe_options_for_cache?'
    from /opt/local/lib/ruby/gems/1.8/gems/nkallen-cache-money-0.2.5/lib/cash/query/abstract.rb:52:in `cacheable?'
    from /opt/local/lib/ruby/gems/1.8/gems/nkallen-cache-money-0.2.5/lib/cash/query/abstract.rb:52:in `each'
    from /opt/local/lib/ruby/gems/1.8/gems/nkallen-cache-money-0.2.5/lib/cash/query/abstract.rb:52:in `cacheable?'
    from /opt/local/lib/ruby/gems/1.8/gems/nkallen-cache-money-0.2.5/lib/cash/query/abstract.rb:15:in `perform'
    from /opt/local/lib/ruby/gems/1.8/gems/nkallen-cache-money-0.2.5/lib/cash/query/abstract.rb:7:in `perform'
    from /opt/local/lib/ruby/gems/1.8/gems/nkallen-cache-money-0.2.5/lib/cash/finders.rb:24:in `find_every'
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/base.rb:1583:in `find_one'
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/base.rb:1569:in `find_from_ids_without_cache'
    from /opt/local/lib/ruby/gems/1.8/gems/nkallen-cache-money-0.2.5/lib/cash/query/abstract.rb:6:in `__send__'
    from /opt/local/lib/ruby/gems/1.8/gems/nkallen-cache-money-0.2.5/lib/cash/query/abstract.rb:6:in `find_from_ids_without_cache'
    from /opt/local/lib/ruby/gems/1.8/gems/nkallen-cache-money-0.2.5/lib/cash/query/abstract.rb:158:in `find_from_keys'
    from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.3/lib/active_support/core_ext/module/delegation.rb:122:in `to_proc'
    from /opt/local/lib/ruby/gems/1.8/gems/nkallen-cache-money-0.2.5/lib/cash/accessor.rb:17:in `call'
... 4742 levels...
    from /opt/local/lib/ruby/gems/1.8/gems/nkallen-cache-money-0.2.5/lib/cash/query/abstract.rb:19:in `perform'
    from /opt/local/lib/ruby/gems/1.8/gems/nkallen-cache-money-0.2.5/lib/cash/query/abstract.rb:7:in `perform'
    from /opt/local/lib/ruby/gems/1.8/gems/nkallen-cache-money-0.2.5/lib/cash/finders.rb:24:in `find_every'
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/base.rb:615:in `find'
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/base.rb:635:in `all'
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/associations/association_collection.rb:379:in `send'
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/associations/association_collection.rb:379:in `method_missing'
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/base.rb:2143:in `with_scope'
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/associations/association_proxy.rb:206:in `send'
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/associations/association_proxy.rb:206:in `with_scope'
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/associations/association_collection.rb:375:in `method_missing'
    from /xxx/app/models/package.rb:43:in `parent_packages'
    from /xxx/app/models/package.rb:96:in `all_package_ids'
    from (irb):78:in `send'
    from (irb):78
    from :0>> 

# == Schema Information
#
# Table name: packages_channels
#
#  channel_id :integer(4)
#  package_id :integer(4)
#  id         :integer(4)      not null, primary key
#

class PackagesChannel < ActiveRecord::Base
  belongs_to :package
  belongs_to :channel

  # memcache indexes
  index :id
  index :package_id
  index [:package_id, :channel_id]
  
end

class Package < ActiveRecord::Base

 has_many :associated_packages
 
 def parent_packages
    # to make things mem_cache friendly (avoiding joins)
    associated_packages.all.collect{|assoc| assoc.associated_package}
 end

  def all_package_ids
    [self.id] + self.parent_packages.map{|pkg| pkg.all_package_ids}.flatten
  end

end

All mock(Story).get.never calls are failing with ArgumentError in ... wrong number of arguments (0 for 1)

I'm on Rails 2.3.3, Ruby 1.8.7, Mac OSX, memcached 1.2.5 (on libevent 1.4.12-stable) is running and receiving requests. Using Cache-money 0.2.5. RR is version 0.10.2

Test config memcache config looks like:
test:
ttl: 604800 namespace: deucescracked sessions: false debug: false servers: localhost:11211

Complete run...

Mac-san:cache_money wiseleyb$ rake
(in /Users/wiseleyb/Dev/dc/deucescracked/vendor/plugins/cache_money) /usr/local/bin/ruby -I"lib:test" "/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake/rake_test_loader.rb"
/usr/local/bin/ruby -I"lib:test" "/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake/rake_test_loader.rb"
/usr/local/bin/ruby -I"lib:test" "/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake/rake_test_loader.rb"
-- create_table("stories", {:force=>true}) -> 0.2287s -- create_table("characters", {:force=>true}) -> 0.0022s -- initialize_schema_migrations_table() -> 0.0027s -- assume_migrated_upto_version(2) -> 0.0012s Profiling enabled.
...........................................FF.F......FFFF......F......F..FF...F...................................................................................................................F...**..

Top 10 slowest examples:
0.7442140 Windows#find(...) when the cache is not populated#find(:all, :conditions => ..., :limit => ...) and query limit <= index limit when there are fewer than limit + buffer items populates the cache with all items
0.6272080 Windows#destroy when the cache is populated when the index size is <= limit of items when the count of records in the database is >= limit of items refreshes the list (from the database)
0.6196620 Windows#destroy when the cache is not populated when count of records in the database is <= limit of items when the count of records in the database is between limit and limit + buffer items populates the index
0.6155840 Windows#find(...) when the cache is populated#find(:all, :conditions => ...) uses the database, not the cache
0.6027420 Windows#find(...) when the cache is populated#find(:all, :conditions => ..., :limit => ...) and query limit > index limit uses the database, not the cache
0.5723260 Windows#find(...) when the cache is populated#find(:all, :conditions => ..., :limit => ..., :offset => ...) and query limit + offset > index limit uses the database, not the cache
0.5702350 Windows#find(...) when the cache is not populated#find(:all, :conditions => ..., :limit => ...) and query limit <= index limit when there are more than limit + buffer items populates the cache with limit + buffer items
0.5175020 Windows#find(...) when the cache is populated#find(:all, :conditions => ..., :limit => ...) and query limit <= index limit does not use the database
0.5068240 Cash::Lock#acquire_lock prevents two processes from acquiring the same lock at the same time
0.5023990 Windows#create! when the cache is not populated when the count of records in the database is > limit + buffer items truncates the index

Pending:

Cash::WriteThrough Locking acquires and releases locks, in order, for all indices to be written (TODO)
./spec/cash/write_through_spec.rb:172

Cash::WriteThrough Locking acquires and releases locks on destroy (TODO)
./spec/cash/write_through_spec.rb:183

1)
ArgumentError in 'Cash::Finders Calculations when the cache is populated#count(:column, :conditions => ...) uses the database, not the cache'
wrong number of arguments (0 for 1)
./spec/cash/calculations_spec.rb:19:

2)
ArgumentError in 'Cash::Finders Calculations when the cache is populated#count(:all, :distinct => ..., :select => ...) uses the database, not the cache'
wrong number of arguments (0 for 1)
./spec/cash/calculations_spec.rb:26:

3)
ArgumentError in 'Cash::Finders Calculations when the cache is not populated#count(:all, ...)#count(:all) uses the database, not the cache'
wrong number of arguments (0 for 1)
./spec/cash/calculations_spec.rb:47:

4)
ArgumentError in 'Cash::Finders Cache Usage when the cache is populated#find#find(:first, ...)#find(:first, :readonly => true) uses the database, not the cache'
wrong number of arguments (0 for 1)
./spec/cash/finders_spec.rb:54:

5)
ArgumentError in 'Cash::Finders Cache Usage when the cache is populated#find#find(:first, ...)#find(:first, :join => ...) or find(..., :include => ...) uses the database, not the cache'
wrong number of arguments (0 for 1)
./spec/cash/finders_spec.rb:62:

6)
ArgumentError in 'Cash::Finders Cache Usage when the cache is populated#find#find(:first, ...)#find(:first) uses the database, not the cache'
wrong number of arguments (0 for 1)
./spec/cash/finders_spec.rb:70:

7)
ArgumentError in 'Cash::Finders Cache Usage when the cache is populated#find#find(:first, ...)#find(:first, :conditions => "...") on unindexed attributes uses the database, not the cache'
wrong number of arguments (0 for 1)
./spec/cash/finders_spec.rb:79:

8)
ArgumentError in 'Cash::Finders Cache Usage when the cache is populated#find#find(:first, ...)#find(:first, :conditions => {...}) on unindexed attribtes uses the database, not the cache'
wrong number of arguments (0 for 1)
./spec/cash/finders_spec.rb:142:

9)
ArgumentError in 'Cash::Finders Cache Usage when the cache is populated#find#find(:all) uses the database, not the cache'
wrong number of arguments (0 for 1)
./spec/cash/finders_spec.rb:217:

10)
ArgumentError in 'Cash::Finders Cache Usage when the cache is populated#find#find([...])#find([1, 2, ...], :conditions => ...) uses the database, not the cache'
wrong number of arguments (0 for 1)
./spec/cash/finders_spec.rb:250:

11)
ArgumentError in 'Cash::Finders Cache Usage when the cache is populated#find#find([...])#find([1], :conditions => ...) uses the database, not the cache'
wrong number of arguments (0 for 1)
./spec/cash/finders_spec.rb:258:

12)
ArgumentError in 'Cash::Finders Cache Usage when the cache is populated#without_cache when finders are called within the provided block uses the database not the cache'
wrong number of arguments (0 for 1)
./spec/cash/finders_spec.rb:302:

13)
ArgumentError in 'Cash::WriteThrough ClassMethods after destroy when the object is a new record does nothing'
wrong number of arguments (0 for 2)
./spec/cash/write_through_spec.rb:134:

Finished in 15.381762 seconds

202 examples, 13 failures, 2 pending
rake aborted!
Command /usr/local/bin/ruby -I"/Users/wiseleyb/.gem/ruby/1.8/gems/rspec-1.2.8/lib" "/Users/wiseleyb/.gem/ruby/1.8/gems/rspec-1.2.8/bin/spec" "spec/cash/accessor_spec.rb" "spec/cash/active_record_spec.rb" "spec/cash/calculations_spec.rb" "spec/cash/finders_spec.rb" "spec/cash/lock_spec.rb" "spec/cash/order_spec.rb" "spec/cash/transactional_spec.rb" "spec/cash/window_spec.rb" "spec/cash/write_through_spec.rb" --format profile --color failed

I'm on Rails 2.3.3, Ruby 1.8.7, Mac OSX, memcached 1.2.5 (on libevent 1.4.12-stable) is running and receiving requests. Using Cache-money 0.2.5. RR is version 0.10.2

If I do a BlogEntry.find(2) it fails with:
ActiveRecord::RecordNotFound: Couldn't find BlogEntry with ID=0

    from /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/base.rb:1586:in `find_one'
    from /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/base.rb:1569:in `find_from_ids_without_cache'
    from /Users/wiseleyb/Dev/dc/deucescracked/vendor/plugins/cache_money/lib/cash/query/abstract.rb:6:in `__send__'
    from /Users/wiseleyb/Dev/dc/deucescracked/vendor/plugins/cache_money/lib/cash/query/abstract.rb:6:in `find_from_ids_without_cache'
    from /Users/wiseleyb/Dev/dc/deucescracked/vendor/plugins/cache_money/lib/cash/query/abstract.rb:158:in `find_from_keys'
    from /Users/wiseleyb/Dev/dc/deucescracked/vendor/plugins/cache_money/lib/cash/query/primary_key.rb:31:in `miss'
    from /Users/wiseleyb/Dev/dc/deucescracked/vendor/plugins/cache_money/lib/cash/query/abstract.rb:66:in `hit_or_miss'
    from /Users/wiseleyb/Dev/dc/deucescracked/vendor/plugins/cache_money/lib/cash/accessor.rb:17:in `call'
    from /Users/wiseleyb/Dev/dc/deucescracked/vendor/plugins/cache_money/lib/cash/accessor.rb:17:in `fetch'
    from /Users/wiseleyb/Dev/dc/deucescracked/vendor/plugins/cache_money/lib/cash/accessor.rb:29:in `get'
    from /Users/wiseleyb/Dev/dc/deucescracked/vendor/plugins/cache_money/lib/cash/query/abstract.rb:65:in `hit_or_miss'
    from /Users/wiseleyb/Dev/dc/deucescracked/vendor/plugins/cache_money/lib/cash/query/abstract.rb:18:in `perform'
    from /Users/wiseleyb/Dev/dc/deucescracked/vendor/plugins/cache_money/lib/cash/query/primary_key.rb:17:in `perform'
    from /Users/wiseleyb/Dev/dc/deucescracked/vendor/plugins/cache_money/lib/cash/query/abstract.rb:7:in `perform'
    from /Users/wiseleyb/Dev/dc/deucescracked/vendor/plugins/cache_money/lib/cash/finders.rb:29:in `find_from_ids'
    from /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.3.3/lib/active_record/base.rb:616:in `find'

If I do BlogEntry.find_by_id(2) first, then BlogEntry.find(2) works (after it's been stored in memcache.

I've tried getting backgroundrb and background-fu going. Cache money seems to be getting in the way somehow -
/var/lib/gems/1.8/gems/nkallen-cache-money-0.2.5/lib/cash/config.rb:18:in `repository': repository delegated to @cache_config.repository, but @cache_config is nil: BdrbJobQueue(id: integer, args: binary, worker_name: string, worker_method: string, job_key: string, taken: integer, finished: integer, timeout: integer, priority: integer, submitted_at: datetime, started_at: datetime, finished_at: datetime, archived_at: datetime, tag: string, submitter_info: string, runner_info: string, worker_key: string, scheduled_at: datetime) (RuntimeError)

It did the same thing for background-fu's Job model too. I have absolutely no idea what is wrong with it.

Please replace those requirements with 'active_record' and 'active_support'. They are deprecated from Rails 2.3.5.

Is it possible to avoid caching if memcached is down without raising an error?