Re^4: Extensions via Moose


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Re^4: Extensions via Moose

by John M. Dlugosz (Monsignor)

on Apr 30, 2011 at 09:06 UTC ( [id://902155]=note: print w/replies, xml )

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in reply to Re^3: Extensions via Moose
in thread Extensions via Moose

Hmm, the code in MooseX::Traits states

# runtime role application is fundamentally broken.  if you really
# need it, write it yourself, but consider applying the roles before
# you create an instance.
[download]

And it is basically a call to:

$trait->meta->apply($self, rebless_params => $rebless_params || {});
[download]

So why should I be scared of Trait->meta->apply? Why would writing it myself be better than the function that appears here?

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Re^5: Extensions via Moose
by stvn (Monsignor) on May 01, 2011 at 01:56 UTC

Hmm, the code in MooseX::Traits states ...

Not sure who wrote that comment, I suspect either Florian or Jonathan Rockway, I would not take that too much to heart, it is an opinion and a somewhat extreme one at that. It also may very well refer to an earlier state of that behavior, a lot of cleanup has taken place in that corner of the code base in the last few years.

So why should I be scared of Trait->meta->apply?

You shouldn't, but some people are scared off by the MOP (which is a good thing sometimes and a bad thing other times).

Why would writing it myself be better than the function that appears here?

Well, what is in MooseX::Traits has already been tested and is regularly tested against the Moose core with our smoke tester. But the code is basically just calls to Moose::Util functions, so I wouldn't worry about writing your own code too much.

-stvn

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