[mst]

You might find the Dwarn command available from http://p3rl.org/Devel::Dwarn (original) and http://p3rl.org/Devel::DDCWarn (newer version with extra-compact output) helpful - it lets you change e.g.

    return $foo->bar->baz;

to

    return Dwarn $foo->bar->baz;

which will 'warn' out the dumped structure and then return it, so you can instrument code for debugging trivially.

DDCWarn also provides a DwarnT so you can add a tag that gets printed but not returned, i.e.

    return DwarnT TAG_NAME => $foo->bar->baz;

There's not really a book on Moose, but the Moose::Manual pages plus Modern Perl plus The Definitive Guide to Catalyst work out pretty well between them for bringing people up to speed.