Q: Undefined method when accessing through association and uninitialized constant when trying to destroy with :dependent => :destroy I've tried persistently googling this error, but to no avail. I currently have these models
app/models/survey.rb
class Survey < ActiveRecord::Base
  belongs_to :user
  has_attached_file :original, :default_url => "/public/:class/:attachment/:basename.:extension"
  has_many :sub_surveys, :dependent => :destroy
end

app/models/sub_survey.rb
class SubSurvey < ActiveRecord::Base
  belongs_to :survey
  has_many :questions, :dependent => :destroy
end

app/models/question.rb
class Question < ActiveRecord::Base
  belongs_to :sub_survey
  validates_presence_of :sub_survey
  acts_as_list :scope => :sub_survey
  #after_destroy :destroy_orphaned_choices

  has_many :answers, :dependent => :destroy
  has_many :choices, :dependent => :destroy
end

app/models/choice.rb
class Choices < ActiveRecord::Base
  belongs_to :question
  validates_presence_of :question
end

app/models/answer.rb
class Answer < ActiveRecord::Base
  belongs_to :question
  belongs_to :user
  belongs_to :game
  validates_uniqueness_of :question_id, :scope => [:user_id, :game_id]
end

Now when I try to destroy a survey, I get an error
uninitialized constant Question::Choice

That traces through /vendor/rails/active* stuff after the survey.destroy
Then when I try to access choices from question.Choices, I get an error 
undefined method `Choices' for #<Question:0xb7224f2c>

which for some reason has this on top of the trace-stack
vendor/rails/activerecord/lib/active_record/attribute_methods.rb:256:in `method_missing'
vendor/plugins/attribute_fu/lib/attribute_fu/associations.rb:28:in `method_missing'
app/views/answers/_answer.html.erb:7:in `_run_erb_47app47views47answers47_answer46html46erb'

I do use attribute_fu when importing surveys in xml-format, but I have no idea why the trace of question.Choices has it.
I also tried renaming choices to choicealternatives, but that didn't have an effect.
Any ideas?

A: Your Choices table has already got a pluralised name which may be causing problems. Ideally that table should be called Choice otherwise your has_many :choices should specify the class_name option too. E.g.
has_many :choices, :class_name => 'Choices'

Though I'd opt for renaming the class and table Choice if you can.
Attachment_fu is probably appearing in the stack trace because they have overridden or aliased the method_missing method to add their own behaviour. It's not necessarily anything to be concerned about.

A: I'm not sure why you get the error when destroying a Survey, but you're getting this
undefined method `Choices' for #<Question:0xb7224f2c>

because you should be accessing it like this:
question.choices # No capitalization

I think that should solve one of the problems.
