From: Christopher Small <sonicdisturber@...>
Date: 2008-07-01T17:19:06+09:00
Subject: Re: Problem with Ruby Multithreading


First of all, do you mean "multithreading" as in the context of 
wikipedia's definition 
(http://en.wikipedia.org/wiki/Thread_(computer_science)), because if so, 
I don't see the connection. Otherwise, I imagine that you are talking 
about forums with multiple threads, or something to that effect.

> I am trying to use threads in my RoR app.
> But unfortunately I came across a very strange issue.
> I am unable to use "finders" within my thread to read data from my
> database.

Are "finders" a specific sort of object in RoR? If so I know nothing 
about them. If you are talking about find methods to search through 
database entries, that's another thing - is this what you mean?


> In addition to this, the Thread does not allow me to create any new
> object inside the Thread.
> 
> Eg:
> 
> class TagsController < ApplicationController
> 
> def some_method
> 
> begin
>   Thread.new do
>    new_user = User.new
>   end
> rescue
>   p $!
> end
> 
> end
> 
> end
> 
> Throws an exception saying
> "#<ArgumentError: A copy of TagsController has been removed from the
> module tree but is still active!>"

First of all, are you writing your app RESTfully? What is "some_method"? 
Also, I'm not quite clear about what you are trying to do here - is it 
create a new thread and a new user at the same time?

I hope that I can be of some help.

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