Rails - Jul 2006 - Catch 22 with after_save. Please help.

I have a pretty strange problem. Here is basically what I have to  
demonstrate my problem:

class Event < ActiveRecord::Base
	def after_create
		AnotherClass.find_event(id)
	end
end

class AnotherClass < ActiveRecord::Base
	def self.find_event(event_id)
		e = Event.find event_id
	end
end

Here is the catch 22 and it''s quite annoying. Basically ActiveRecord  
puts to whole save action into a transaction. If an exception is  
raised in the after_create method it rolls back the transaction, as  
if the save never happened. The problem is that during the  
transaction the save is never committed to the database. So  
AnotherClass.find_event raises the exception "Can''t find event
with
id=34" or whatever id it had, because the transaction hasn''t been
committed. That exception then rolls back the transaction, creating a  
catch 22.

So basically what I''m asking if there an after_after_create method?  
ha ha. Basically a method that gets called after the transaction is  
committed.

Also, in case you were wondering I did set up an EventObserver and  
get the same exact problem.

Lastly, I can not pass the object because AnotherClass is in a  
background process and passing methods between processes is not  
permitted. I''m using backgroundrb for this.

Any help is greatly appreciated.

Thank You,
Ben Johnson
E: bjohnson@contuitive.com



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On Jul 18, 2006, at 6:40 PM, Ben Johnson wrote:
> I have a pretty strange problem. Here is basically what I have to  
> demonstrate my problem:
>
> class Event < ActiveRecord::Base
> 	def after_create
> 		AnotherClass.find_event(id)
> 	end
> end
>
> class AnotherClass < ActiveRecord::Base
> 	def self.find_event(event_id)
> 		e = Event.find event_id
> 	end
> end
>
> Here is the catch 22 and it''s quite annoying. Basically  
> ActiveRecord puts to whole save action into a transaction. If an  
> exception is raised in the after_create method it rolls back the  
> transaction, as if the save never happened. The problem is that  
> during the transaction the save is never committed to the database.  
> So AnotherClass.find_event raises the exception "Can''t find
event
> with id=34" or whatever id it had, because the transaction
hasn''t
> been committed. That exception then rolls back the transaction,  
> creating a catch 22.
>
> So basically what I''m asking if there an after_after_create
method?
> ha ha. Basically a method that gets called after the transaction is  
> committed.
>
> Also, in case you were wondering I did set up an EventObserver and  
> get the same exact problem.
>
> Lastly, I can not pass the object because AnotherClass is in a  
> background process and passing methods between processes is not  
> permitted. I''m using backgroundrb for this.
>
> Any help is greatly appreciated.
>
> Thank You,
> Ben Johnson
> E: bjohnson@contuitive.com
>
>

Hey Ben-

	Actually there is a way to pass full instantiated active record  
objects to the drb server. What you need to do is in your model class  
definition you need to add the following line to each model you want  
to send over the wire to the drb server:

include DRbUndumped


	And then you can pass the objects to the drb server and back.

-Ezra

>
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