Weird active record problem - goes away with cache_classes change

rubyonrails-talk
1

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) %></

<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?