Rails - Sep 2010 - Railroad problem with :through?

I have the following model layout:

class List < ActiveRecord::Base
has_many :subscribers, :through => :list_subscribers
has_many :list_subscribers
end

class Subscriber < ActiveRecord::Base
has_many :lists
has_many :lists, :through => :list_subscribers
end

class ListSubscriber< ActiveRecord::Base
belongs_to :list
belongs_to :subscriber

validates_uniqueness_of :subscriber_id, :scope => :list_id
end

and get the following error:

railroad -i -l -a -m -M | dot -Tpng | sed
''s/font-size:14.00/font-size:12.00/g'' > doc/models.png
/usr/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/whiny_nil.rb:52:in
`method_missing'': undefined method `klass'' for nil:NilClass
(NoMethodError)
from
/usr/lib/ruby/gems/1.8/gems/activerecord-2.3.8/lib/active_record/reflection.rb:320:in
`source_reflection''
from
/usr/lib/ruby/gems/1.8/gems/activerecord-2.3.8/lib/active_record/reflection.rb:320:in
`collect''
from
/usr/lib/ruby/gems/1.8/gems/activerecord-2.3.8/lib/active_record/reflection.rb:320:in
`source_reflection''
from
/usr/lib/ruby/gems/1.8/gems/activerecord-2.3.8/lib/active_record/reflection.rb:381:in
`derive_class_name''
from
/usr/lib/ruby/gems/1.8/gems/activerecord-2.3.8/lib/active_record/reflection.rb:112:in
`class_name''
from
/home/kaitest/.gem/ruby/1.8/gems/dmattes-railroad_xing-0.5.4/lib/railroad/ar_model.rb:85:in
`process_association''
from
/home/kaitest/.gem/ruby/1.8/gems/dmattes-railroad_xing-0.5.4/lib/railroad/ar_model.rb:65:in
`edges''
from
/home/kaitest/.gem/ruby/1.8/gems/dmattes-railroad_xing-0.5.4/lib/railroad/ar_model.rb:64:in
`each''
from
/home/kaitest/.gem/ruby/1.8/gems/dmattes-railroad_xing-0.5.4/lib/railroad/ar_model.rb:64:in
`edges''
from
/home/kaitest/.gem/ruby/1.8/gems/dmattes-railroad_xing-0.5.4/lib/railroad/models_diagram.rb:69:in
`process_class''
from
/home/kaitest/.gem/ruby/1.8/gems/dmattes-railroad_xing-0.5.4/lib/railroad/models_diagram.rb:29:in
`generate''
from
/home/kaitest/.gem/ruby/1.8/gems/dmattes-railroad_xing-0.5.4/lib/railroad/models_diagram.rb:28:in
`each''
from
/home/kaitest/.gem/ruby/1.8/gems/dmattes-railroad_xing-0.5.4/lib/railroad/models_diagram.rb:28:in
`generate''
from
/home/kaitest/.gem/ruby/1.8/gems/dmattes-railroad_xing-0.5.4/bin/railroad:47
from /home/kaitest/.gem/ruby/1.8/bin/railroad:19:in `load''
from /home/kaitest/.gem/ruby/1.8/bin/railroad:19

Any help much appreciated.
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Sem Ptiri wrote:

Is this a typo, or your problem source?
> class Subscriber < ActiveRecord::Base
> has_many :lists
> has_many :lists, :through => :list_subscribers
> end
> 
class Subscriber < ActiveRecord::Base
  has_many :list_subscribers
  has_many :lists, :through => :list_subscribers
end
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Ar Chron wrote:
> Sem Ptiri wrote:
> 
> Is this a typo, or your problem source?
> 
>> class Subscriber < ActiveRecord::Base
>> has_many :lists
>> has_many :lists, :through => :list_subscribers
>> end
>> 
> 
> class Subscriber < ActiveRecord::Base
>   has_many :list_subscribers
>   has_many :lists, :through => :list_subscribers
> end
My problem source.

Thank you.
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