Rails - Apr 2008 - Calling to_yaml on an array of ActiveRecord objects is producing TypeError: wrong argument type nil (expected Data)

I have a query I am running from the console that is eager loading the
address on the people model:

people = People.find(:all,
                               :include => [:address],
                               :limit => 50)

Trying to output that to yaml via:

people.to_yaml

Produces the following exception:

TypeError: wrong argument type nil (expected Data)
	from /usr/local/lib/ruby/1.8/yaml.rb:387:in `emit''
	from /usr/local/lib/ruby/1.8/yaml.rb:387:in `quick_emit''
	from /usr/local/lib/ruby/1.8/yaml/rubytypes.rb:107:in `to_yaml''
	from (irb):10

I don''t see any nil data in the include... thoughts?

Thanks,

Scott
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I also run into the same error when running Spec tests that trigger 
Observers, which trigger DelayedJobs.

The full stack trace:

ruby-1.8.7-p249/lib/ruby/1.8/yaml.rb:391:in `emit''
ruby-1.8.7-p249/lib/ruby/1.8/yaml.rb:391:in `quick_emit''
ruby-1.8.7-p249/lib/ruby/1.8/yaml/rubytypes.rb:15:in `to_yaml''
vendor/bundler_gems/gems/delayed_job-2.0.3/lib/delayed/backend/base.rb:61:in 
`payload_object=''
vendor/bundler_gems/gems/activerecord-2.3.5/lib/active_record/base.rb:2746:in 
`send''
vendor/bundler_gems/gems/activerecord-2.3.5/lib/active_record/base.rb:2746:in 
`attributes=''
vendor/bundler_gems/gems/activerecord-2.3.5/lib/active_record/base.rb:2742:in 
`each''
vendor/bundler_gems/gems/activerecord-2.3.5/lib/active_record/base.rb:2742:in 
`attributes=''
vendor/bundler_gems/gems/activerecord-2.3.5/lib/active_record/base.rb:2438:in 
`initialize''
vendor/bundler_gems/gems/activerecord-2.3.5/lib/active_record/base.rb:721:in 
`new''
vendor/bundler_gems/gems/activerecord-2.3.5/lib/active_record/base.rb:721:in 
`create''
vendor/bundler_gems/gems/delayed_job-2.0.3/lib/delayed/backend/base.rb:21:in 
`enqueue''
app/models/mail_opt_in_observer.rb:12:in `after_save''
app/models/mail_opt_in_observer.rb:11:in `each''
app/models/mail_opt_in_observer.rb:11:in `after_save''
vendor/plugins/state_machine/lib/state_machine/integrations/active_record/observer.rb:32:in
`send''
vendor/plugins/state_machine/lib/state_machine/integrations/active_record/observer.rb:32:in
`update''

I''ve been trying to find the root of this for a few days now and its 
getting a little frustrating. I''ve tried to re-open the class and do
the
following (because I noticed the error doesn''t occur when I *clone* the
object and then call to_yaml).

module ActiveRecord
  class Base

    to_old_yaml = self.instance_method(:to_yaml)

    define_method(:to_yaml) do
      clone = self.clone
     clone.id = self.id
      oh_boy = to_old_yaml.bind(clone).call
     #debugger
     #testtest = ''test''
      return oh_boy
    end

  end
end

...but this yields a similar error:

wrong argument type String (expected Data)
> Scott wrote:
> I have a query I am running from the console that is eager loading the
> address on the people model:
> 
> people = People.find(:all,
>                                :include => [:address],
>                                :limit => 50)
> 
> Trying to output that to yaml via:
> 
> people.to_yaml
> 
> Produces the following exception:
> 
> TypeError: wrong argument type nil (expected Data)
>   from /usr/local/lib/ruby/1.8/yaml.rb:387:in `emit''
>   from /usr/local/lib/ruby/1.8/yaml.rb:387:in `quick_emit''
>   from /usr/local/lib/ruby/1.8/yaml/rubytypes.rb:107:in `to_yaml''
>   from (irb):10
> 
> I don''t see any nil data in the include... thoughts?
> 
> Thanks,
> 
> Scott
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