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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