[CDBI] order by a foreign key

Marcello m.romani at spinsoft.it
Wed Aug 17 08:33:17 BST 2005


Marcello ha scritto:
> Hallo everybody,
>     I'm working with Class-DBI in a catalyst project, and I found a 
> problem that I think is not directly related to Catalyst, but to 
> Class-DBI (or perhaps to Class::DBI::Plugin::RetrieveAll).
> 
> Let me first describe the scenario:
> 
> I have two tables, 'cd' and 'artist', whose model classes are MyApp::Cd 
> and MyApp::Artist.
> 
> MyApp::Artist is stringified as 'name'
> 
> The relationship is:
> MyApp:Cd->has_a( artist => MyApp::Artist );
> 
> MyApp::Cd uses Class::DBI::Plugin::RetrieveAll, so I can say:
> my @cds = MyApp::Cd->retrieve_all_sorted_by( $order ); # e.g. title ASC
> 
> And now to the point:
> if $order == 'artist' the @cds list gets ordered by the artist *id*, not 
> by the artist name.
> 
> What I would like to obtain is a list ordered by the foreign class's 
> 'stringify' column.
> 
> (just to clarify I know this is the obvious behaviour and I know how to 
> solve this in SQL, but I was looking for a general solution that would 
> fit into Class-DBI)
> 
> I've coded a solution (tested) into one of my model classes, but I would 
> like to use it in other classes/projects without any cut'n'paste coding ;-)
> So I'm wandering wether to modify Class::DBI::Plugin::RetrieveAll or to 
> override retrieve_all_sorted_by in my base CDBI model class...
> 
> Has anybody had/solved this issue before ?
> 
> (Sorry for getting too Catalyst specific in the last part)
> 
> Marcello
> 
> _______________________________________________
> ClassDBI mailing list
> ClassDBI at lists.digitalcraftsmen.net
> http://lists.digitalcraftsmen.net/mailman/listinfo/classdbi
> 

I managed to insert my solution into Class::DBI::Plugin::RetrieveAll
For those interested, the patch is located at:

http://rt.cpan.org/NoAuth/Bug.html?id=14202

Marcello




More information about the ClassDBI mailing list