undefined method `eq' for nil:NilClass with rails 3 and ruby enterprise on ubuntu hardy

Question

I am not sure what causes this error but since I came across this issue in passenger and now in the console as well I am thinking maybe the mysql driver is the problem? Everything works as expected on osx/10.6. It just won't on Ubuntu 8.04 hardy.

I nailed down the problem to either the "destroy" method or also when I call a method of an activerecord instance directly. Why is this happening? Any ideas?

System:

• Ubuntu 8.04 hardy.
• ruby 1.8.7 (2010-04-19 patchlevel 253) [i686-linux], MBARI 0x8770, Ruby Enterprise Edition 2010.02
• rails 3.0.0-beta4
• mysql Ver 14.12 Distrib 5.0.51a, for debian-linux-gnu (i486) using readline 5.2

Here's the error output

root@gehege:/var/www/foobar.com/api.foobar.com/v1# rake cleanup:status_cleanup RAILS_ENV=production --trace
(in /var/www/foobar.com/api.foobar.com/v1)
** Invoke cleanup:status_cleanup (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute cleanup:status_cleanup
rake aborted!
undefined method `eq' for nil:NilClass
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta4/lib/active_record/persistence.rb:76:in `destroy'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta4/lib/active_record/locking/optimistic.rb:110:in `destroy'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta4/lib/active_record/callbacks.rb:278:in `destroy'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/activesupport-3.0.0.beta4/lib/active_support/callbacks.rb:412:in `_run_destroy_callbacks'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta4/lib/active_record/callbacks.rb:278:in `destroy'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta4/lib/active_record/transactions.rb:230:in `destroy'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta4/lib/active_record/transactions.rb:287:in `with_transaction_returning_status'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta4/lib/active_record/connection_adapters/abstract/database_statements.rb:139:in `transaction'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta4/lib/active_record/transactions.rb:202:in `transaction'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta4/lib/active_record/transactions.rb:285:in `with_transaction_returning_status'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/activerecord-3.0.0.beta4/lib/active_record/transactions.rb:230:in `destroy'
/var/www/foobar.com/api.foobar.com/v1/lib/tasks/cleanup.rake:8
/var/www/foobar.com/api.foobar.com/v1/lib/tasks/cleanup.rake:6:in `each'
/var/www/foobar.com/api.foobar.com/v1/lib/tasks/cleanup.rake:6
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `each'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/1.8/monitor.rb:242:in `synchronize'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `each'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2001:in `run'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998:in `run'
/opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/rake-0.8.7/bin/rake:31
/opt/ree/bin/rake:19:in `load'
/opt/ree/bin/rake:19

EDIT:

Even after running an apt-get update/upgrade to the latest hardy packages and recompiling ree and the mysql gem I get the same error.

Answer 1

I have the same error when delete from table with no id field. I think this is a Rails 3 beta 4 bug.

Answer 2

to answer my own question: after some research i found out that rails (activerecord) needs id fields on tables that are mapped to models. if you use linktables they are not needed - but for tables you want to adress as models, they are. in my case the solution was to add

set_primary_key :cal_id

where cal_id is my unique key.

Answer 3

I found this problem after I converted a HABTM table with no id to a join model for has_many :through. I forgot to add :id column...