undefined class/module

Hi,

We are running a Rails application in development mode.
Intermittenly we
get an error on some pages, saying : undefine class/module
User. If we
refresh the page, the error goes away and we see the html
correctly
rendered. User is a model defined in the models directory
and has been
listed in application.rb as model :user.

I am suprised by the fact that this happens only
occasionally. Can
someone suggest what might have gone wrong?

Thanks,
Yash

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Yash wrote:
> Hi,
> 
> We are running a Rails application in development mode.
Intermittenly we
> get an error on some pages, saying : undefine
class/module User. If we
> refresh the page, the error goes away and we see the
html correctly
> rendered. User is a model defined in the models
directory and has been
> listed in application.rb as model :user.
> 
> I am suprised by the fact that this happens only
occasionally. Can
> someone suggest what might have gone wrong?
> 
> Thanks,
> Yash

I have seen this problem too. It seems to happen when the
system is
under heavy load. I suspect that the reflection technique
used to
get the table details is hitting some timeout when trying to
access
the database.
The environment where it occasionally occurs for me is
-- Development mode, Rails 1.0, Ruby 1.8.4
-- Linux
-- Postgres
-- Webrick using SSL
-- Heavy load

My questions:
If a timeout occurs on db access, shouldn't Rails just
retry later? 
(that would be the robust thing)
How can development mode cause this kind of error? (makes
things slower, 
yes ... but they shouldn't *break*).

-- Mike Berrow




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Mike Berrow wrote:
> Yash wrote:
>> Hi,
>> 
>> We are running a Rails application in development
mode. Intermittenly we
>> get an error on some pages, saying : undefine
class/module User. If we
>> refresh the page, the error goes away and we see
the html correctly
>> rendered. User is a model defined in the models
directory and has been
>> listed in application.rb as model :user.
>> 
>> I am suprised by the fact that this happens only
occasionally. Can
>> someone suggest what might have gone wrong?
>> 
>> Thanks,
>> Yash
> 
> I have seen this problem too. It seems to happen when
the system is
> under heavy load. I suspect that the reflection
technique used to
> get the table details is hitting some timeout when
trying to access
> the database.
> The environment where it occasionally occurs for me is
> -- Development mode, Rails 1.0, Ruby 1.8.4
> -- Linux
> -- Postgres
> -- Webrick using SSL
> -- Heavy load
> 
> My questions:
> If a timeout occurs on db access, shouldn't Rails just
retry later? 
> (that would be the robust thing)
> How can development mode cause this kind of error?
(makes things slower, 
> yes ... but they shouldn't *break*).
> 
> -- Mike Berrow

I am under ruby 1.8.5,rails 1.1.6,Development mode,system is
not under 
heavy load:
require 'Cring'
class QueryController < ApplicationController
......
score_cache ||= File.zero?('score.cache') ? Hash.new
: 
Marshal.load(f)
......
It's all right when this Controller be called the first
time,then it 
will nerver run,just raise this exception:undefined
class/module Cring
After restart my Webrick,it will be right just once,then
raise 
exception!

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