[Dbix-class] DBIC and Moo woes

[Aran Deltac]

I've been converting a lot of @work's custom components, result, result
set, schema, and storage classes (yes, we even have custom storage classes)
to Moo roles and classes.

I've just about completed it and have worked through a lot of issues, but
am left with one remaining issue which I'm stumped at and have been able to
whittle it down to a couple small examples:

package FooResult;
use Moo;
print 'HAS BUILDARGS: ' . (FooResult->can('BUILDARGS') ? 'YES' : 'NO') .
"\n";
extends 'DBIx::Class::Core';
print 'HAS BUILDARGS: ' . (FooResult->can('BUILDARGS') ? 'YES' : 'NO') .
"\n";

That prints:
HAS BUILDARGS: YES
HAS BUILDARGS: NO

I was able to change this to YES-YES by adding Moo::Object to the front of
my extends, which in the above example would look like:

extends 'Moo::Object', 'DBIx::Class::Core';

Is that the right thing to do when inheriting from a non-Moo class?
Documentation on non-moo inheritance was minimal in the Moo docs, but maybe
I missed it.  Note that I found this issue via a Moose result class which
inherits from my Moo result base class which inherits from
DBIx::Class::Core.  Something about that relationship structure requires
BUILDARGS even though the involved code neither declares nor calls
BUILDARGS.

Another issue is this:

package FooResult;
use Moo;
extends 'DBIx::Class::Core';
has bar => ( is=>'ro' );
FooResult->new( bar=>32 );

Which then hangs with:

Deep recursion on subroutine "DBIx::Class::Row::throw_exception" at
/home/aran/local-lib/lib/perl5/DBIx/Class/Row.pm line 1416.
Deep recursion on subroutine "DBIx::Class::Row::result_source" at
/home/aran/local-lib/lib/perl5/DBIx/Class/Row.pm line 1568.

I tried fiddling with FOREIGNBUILDARGS to see if I could produce arguments
which made DBIC's new() happy but it was a fruitless effort.

At this point the error I am getting with the real application code is:

DBIx::Class::Sims::load_sims(): Can't call method "new" on an undefined
value at /home/aran/local-lib/lib/perl5/DBIx/Class/ResultSet.pm line 2590.
at /home/aran/ziprecruiter/app/t/lib/Test/ZR/Schema.pm line 95

Which is what lead me to the two previous examples.  As far as I can tell
my Moo conversion is complete and there is something wrong with the
argument processing between Moo and DBIC.

I'm using the latest DBIC (0.082800) and Moo (1.006).

Any pointers, examples, words of wisdom, RTFMs, etc, appreciated.

Thanks!
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.scsys.co.uk/pipermail/dbix-class/attachments/20141001/a694848c/attachment.htm>