Strange Error

gistfile1.txt

module Trans 
end

class Job < ActiveRecord::Base
  has_many :job_translations
  has_many :default_job_translations, :through => :job_translations
end

class DefaultJobTranslation < ActiveRecord::Base
  named_scope :forum, where(:group=>"forum")
end

class JobTranslation < ActiveRecord::Base 
  belongs_to :default_job_translation
  include Trans <---- If I remove this line then the below error does not occur
end

job = Job.find 4
job.default_job_translations <--- this causes error

NameError: uninitialized constant Job::JobTranslation
	from /home/chrisr/.rvm/gems/ruby-1.8.7-head/gems/activerecord-3.0.1/lib/active_record/base.rb:1201:in `compute_type'
	from /home/chrisr/.rvm/gems/ruby-1.8.7-head/gems/activerecord-3.0.1/lib/active_record/reflection.rb:162:in `send'
	from /home/chrisr/.rvm/gems/ruby-1.8.7-head/gems/activerecord-3.0.1/lib/active_record/reflection.rb:162:in `klass'
	from /home/chrisr/.rvm/gems/ruby-1.8.7-head/gems/activerecord-3.0.1/lib/active_record/reflection.rb:338:in `source_reflection'