Backgroundrb devel - Sep 2006 - question about passing array of AR objects to worker

got a wierd problem maybe someone can help with.

whenever i try to pass an array or AR objects to my worker, i end up
with a DRb object in the worker...here''s an example

class SearchWorker < BackgrounDRb::Rails

  attr_reader :resources

  def do_work(resources)
    logger.info resources.inspect
  end
end

class SearchController < ApplicationController

  def start_search
    @resources = Resource.find(:all)
    logger.info @resources.inspect
    session[:job_key] = MiddleMan.new_worker(:class => :search_worker,
:args => @resources)
  end
end

class Resource < ActiveRecord::Base
  include DRbUndumped
  # attribute, "uri", string
end

now, my controller logs the array as:

[#<Resource:0xb79d9f58
@attributes={"uri"=>"http://www.google.com/search?hl=en&q=ruby+on+rails&btnG=Google+Search",
"id"=>"1"}>, #<Resource:0xb79d9ee0
@attributes={"uri"=>"http://eee.tsinghua.edu.cn/",
"id"=>"2"}>,
#<Resource:0xb79d9ea4
@attributes={"uri"=>"http://www.digg.com/?s=ruby+on+rails",
"id"=>"3"}>, #<Resource:0xb79d9e68
@attributes={"uri"=>"http://www.a9.com/ruby%20on%20rails",
"id"=>"4"}>, #<Resource:0xb79d9e2c
@attributes={"uri"=>"http://www.yahoo.com/search?p=ruby+on+rails&fr=FP-tab-web-t500&toggle=1&cop=&ei=UTF-8",
"id"=>"5"}>, #<Resource:0xb79d9da0
@attributes={"uri"=>"http://search.msn.com/results.aspx?q=ruby+on+rails&FORM=QBHP",
"id"=>"6"}>]


but the worker logs it as (in backgroundrb.log) as

#<DRb::DRbObject:0xb77c09a8 @ref=-607202372,
@uri="druby://localhost:42531">

can someone explain what''s going on here?

Chris

its not good to pass AR objects to your worker, that has sth to do with DRb
itself, dont know exactly what... a way around that is to pass the ids of
the object or somthing else to identify the record.

2006/9/5, Chris Hall <christopher.k.hall at
gmail.com>:
>
> got a wierd problem maybe someone can help with.
>
> whenever i try to pass an array or AR objects to my worker, i end up
> with a DRb object in the worker...here''s an example
>
> class SearchWorker < BackgrounDRb::Rails
>
>   attr_reader :resources
>
>   def do_work(resources)
>     logger.info resources.inspect
>   end
> end
>
> class SearchController < ApplicationController
>
>   def start_search
>     @resources = Resource.find(:all)
>     logger.info @resources.inspect
>     session[:job_key] = MiddleMan.new_worker(:class => :search_worker,
> :args => @resources)
>   end
> end
>
> class Resource < ActiveRecord::Base
>   include DRbUndumped
>   # attribute, "uri", string
> end
>
> now, my controller logs the array as:
>
> [#<Resource:0xb79d9f58
> @attributes={"uri"=>"
>
http://www.google.com/search?hl=en&q=ruby+on+rails&btnG=Google+Search",
> "id"=>"1"}>, #<Resource:0xb79d9ee0
> @attributes={"uri"=>"http://eee.tsinghua.edu.cn/",
"id"=>"2"}>,
> #<Resource:0xb79d9ea4
>
@attributes={"uri"=>"http://www.digg.com/?s=ruby+on+rails",
> "id"=>"3"}>, #<Resource:0xb79d9e68
>
@attributes={"uri"=>"http://www.a9.com/ruby%20on%20rails",
> "id"=>"4"}>, #<Resource:0xb79d9e2c
> @attributes={"uri"=>"
>
http://www.yahoo.com/search?p=ruby+on+rails&fr=FP-tab-web-t500&toggle=1&cop=&ei=UTF-8
> ",
> "id"=>"5"}>, #<Resource:0xb79d9da0
> @attributes={"uri"=>"
> http://search.msn.com/results.aspx?q=ruby+on+rails&FORM=QBHP",
> "id"=>"6"}>]
>
>
> but the worker logs it as (in backgroundrb.log) as
>
> #<DRb::DRbObject:0xb77c09a8 @ref=-607202372,
> @uri="druby://localhost:42531">
>
> can someone explain what''s going on here?
>
> Chris
> _______________________________________________
> Backgroundrb-devel mailing list
> Backgroundrb-devel at rubyforge.org
> http://rubyforge.org/mailman/listinfo/backgroundrb-devel
>


-- 
Michael Siebert <info at siebert-wd.de>

www.siebert-wd.de - Gedanken lesen
www.stellar-legends.de - Weltraum-Browsergame im Alpha-Stadium
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Hi ~

On Sep 5, 2006, at 9:09 AM, Chris Hall wrote:
> got a wierd problem maybe someone can help with.
>
> whenever i try to pass an array or AR objects to my worker, i end up
> with a DRb object in the worker...here''s an example
>
> class SearchWorker < BackgrounDRb::Rails
>
>   attr_reader :resources
>
>   def do_work(resources)
>     logger.info resources.inspect
>   end
> end
>
> class SearchController < ApplicationController
>
>   def start_search
>     @resources = Resource.find(:all)
>     logger.info @resources.inspect
>     session[:job_key] = MiddleMan.new_worker(:class => :search_worker,
> :args => @resources)
>   end
> end
>
> class Resource < ActiveRecord::Base
>   include DRbUndumped
>   # attribute, "uri", string
> end
>
> now, my controller logs the array as:
>
> [#<Resource:0xb79d9f58
>
@attributes={"uri"=>"http://www.google.com/search?hl=en&q=ruby+on
> +rails&btnG=Google+Search",
> "id"=>"1"}>, #<Resource:0xb79d9ee0
> @attributes={"uri"=>"http://eee.tsinghua.edu.cn/",
"id"=>"2"}>,
> #<Resource:0xb79d9ea4
>
@attributes={"uri"=>"http://www.digg.com/?s=ruby+on+rails",
> "id"=>"3"}>, #<Resource:0xb79d9e68
>
@attributes={"uri"=>"http://www.a9.com/ruby%20on%20rails",
> "id"=>"4"}>, #<Resource:0xb79d9e2c
>
@attributes={"uri"=>"http://www.yahoo.com/search?p=ruby+on
> +rails&fr=FP-tab-web-t500&toggle=1&cop=&ei=UTF-8",
> "id"=>"5"}>, #<Resource:0xb79d9da0
>
@attributes={"uri"=>"http://search.msn.com/results.aspx?q=ruby+on
> +rails&FORM=QBHP",
> "id"=>"6"}>]
>
>
> but the worker logs it as (in backgroundrb.log) as
>
> #<DRb::DRbObject:0xb77c09a8 @ref=-607202372, @uri="druby:// 
> localhost:42531">
>
> can someone explain what''s going on here?
>
> Chris

Hey Chris-

	This is the way that DRb works. For any object that you include  
DRbUndumped into, drb creates a proxy DRbObject on the other side of  
the wire. So #inspect will tell you its a DRbObject instead of your  
AR model. But you can just pretend that it really is your AR model  
and call whatever methods on it that you want and it will work. Its  
just that #inspect shows th proxy object instead of what the real  
object is.

-Ezra