Rails - Oct 2007 - Weird active record problem - goes away with cache_classes change

I have three active record objects, User, Question and Answer

- Questions belong to a user and has_many answers
- Answer belongs to a user

Now, when I start with an array of answers, I can do this
successfully:

for a in answers
  a.user.user_id
end

If I do this:

for q in questions
  answers = q.answers
  for a in answers
    a.user.user_id
  end
end

It works the first time, but it fails the 2nd time on with this:

ActionView::TemplateError (undefined method `user'' for #<Answer:
0x351617c>) on line #45 of app/views/lib/_qnalist.rhtml:
42:                                             <div class="qna-a-
details">
43:                                                     <span
class="qna-a-body"><%= format_line_wrap(a.body, width, 14)
%></
span><br>
44:                                                     <span
class="qna-a-info">
45:
Answered by <%= a.user.user_id %> - <%= a.created_at %>
46:                                                     </span>
47:                                             </div>
48:                                             <div class="very-
narrow-space">&nbsp</div>

However, this is fixed IF I change development.rb and change
cache_classes to true

config.cache_classes = true

I have no clue what is happening :(.

Any one knows how to fix this?


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