[Dbix-class] Fine-tuning of prefetched relationships

[Peter Rabbitson]

On Mon, Apr 01, 2013 at 08:54:55AM -0400, Shea Levy wrote:
> Hi Peter,
> 
> On 04/01/2013 08:46 AM, Peter Rabbitson wrote:
> >On Mon, Apr 01, 2013 at 08:43:43AM -0400, Shea Levy wrote:
> >>Hi all,
> >>
> >>In my db, a Project has many Jobs. I have a query on Projects where
> >>I want to:
> >>
> >>1. Sort the jobs of each project by a particular column on the Jobs table
> >>2. Only include jobs that satisfy some criterion, without excluding
> >>    projects where no such jobs exist (i.e. add a condition to JOIN ON,
> >>    not WHERE)
> >>
> >>Are either of these possible with a single search on Projects?
> >>Currently we're breaking it up into two queries.
> >Both are possible using usual syntax (and a custom-condition
> >relationship) in a single query using the 0.08242 or greater (not yet
> >released) version.
> 
> So something like (using Catalyst in my project):
> 
> $c->model('DB::Projects')->search({ "jobs.hidden" => 0} {order_by =>
> "jobs.name" })
> 

Almost - jobs.hidden will produce a WHERE condition (what you do not 
want). Instead you want to declare a *new* relationship like this:

https://github.com/dbsrgits/dbix-class/blob/master/t/lib/DBICTest/Schema/Artist.pm#L53

Cheers