Railroad problem with :through?

rubyonrails-talk
1

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.

2

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

3

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.