[Openinteract-help] Links_to problems

[Vsevolod (S. I. <si...@cs...>]

Chris,

At the risk of being a pain, I'll repost my two previous questions about 
links_to: I have a current project which is stalled because of them.

This refers to the solution that you suggested when I do this:

SPOPS class: SPOPS_Books
Your class: MyBooks isa SPOPS_Books
SPOPS class: SPOPS_Publisher
Your class: MyPublisher isa SPOPS_Publisher

Then declare in your publisher configuration:

  links_to => { MyBooks => 'link_table' }

1. My classes have a superclass. Let's call it MyObject. So I inherit 
MyBooks from SPOPS_Books and MyObject. I have to double-dispatch the 
new() method, but I can live with it.

However, I use strict field checking and field autodiscovery. When I 
begin to store attributes in MyObject via the regular Perl getter/setter 
methods which use $self as a hashref, I start to get SPOPS errors about 
accessing fields that are not present.

Obviously, I can turn strict fields checking off, but I'd like to retain 
that. The alternative is to somehow keep autodiscovery, but add in the 
config hash of SPOPS_Books additional fields which correspond to 
"instance variables" of MyObject. I am not sure how to do it, but even 
if I could, it's messy because I'll have to repeat it in every SPOPS_* 
class. This can be made a little less messy if I do not inherit from 
MyObject, but store a reference to it, but this one reference still has 
to be mentioned in SPOPS config.

2. I am trying to use objects that refer to each other, and I use 
links_to in both configuration. (I call them Job and Task, but they are 
similar in their relationship to Publisher and Book).

I attach the four class files and the script that tries to use them.
I inherit Job from SPOPS_Job and Task from SPOPS_Task. The SPOPS 
configuration refers to Common.pm, which would be different in your case.

There are four possible configurations:
SPOPS_Job links to SPOPS_Task, SPOPS_Task links to SPOPS_Job
SPOPS_Job links to Task, SPOPS_Task links to SPOPS_Job
SPOPS_Job links to SPOPS_Task, SPOPS_Task links to Job
SPOPS_Job links to Task, SPOPS_Task links to Job

The first three work, but the last one, which is of greater interest, 
does not. Could you please look at this and tell me if I am doing 
anything wrong?

The error message is:
Cannot run behavior in [links_to] [SPOPS_Job]: Failed to retrieve 
configuration from Compilation failed in require at Job.pm line 5.


The tables that the config files refer to are created thusly:

CREATE TABLE `Job` (`job_id` int(11));
CREATE TABLE `Task` (`task_id` int(11));
CREATE TABLE `JobToTask` (`id` int(11), `job_id` int(11), `task_id` 
int(11));

Thanks,
Simon

-- 

Simon (Vsevolod ILyushchenko)   si...@cs...
				http://www.simonf.com

America's business leaders simply don't want to think
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