Hi,
My system has been encounter this problem, and I couldn't find
solution after debugging. My scenario is stated below:
class user
has_many :posts
has_many :comments
end
class post
belongs_to :user
has_many :comments, :as => :commentable
end
class comment
belongs_to :post
belongs_to :user
end
For this case, I am trying to retrieve each post's comment together
with submitter username and I write as below:
class PostsController<ApplicationController
def show
raise @post.comments.first.user.inspect
end
end
While the first time I run this script, it works fine. But, after I
hitting a refresh, it hits following problem "can't dup NilClass". It
is repeats the same for everytime i restart mongrel, working for the
first time and failed for the rest.
I append the application error log as below:
/opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/
base.rb:2189:in `dup'
/opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/
base.rb:2189:in `scoped_methods'
/opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/
base.rb:2193:in `current_scoped_methods'
/opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/
base.rb:2183:in `scope'
/opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/
base.rb:1548:in `find_every'
/opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/
base.rb:1588:in `find_one'
/opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/
base.rb:1574:in `find_from_ids'
/opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/
base.rb:616:in `find'
/opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/
associations/belongs_to_association.rb:44:in `find_target'
/opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/
associations/association_proxy.rb:240:in `load_target'
/opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/
associations/association_proxy.rb:112:in `reload'
/opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/
associations.rb:1231:in `user'
Need some help for this. Thanks in advance.
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