[Catalyst] Re: Alternatives to Catalyst ?

Aristotle Pagaltzis pagaltzis at gmx.de
Mon Apr 26 21:59:49 GMT 2010

* Zbigniew Lukasiak <zzbbyy at gmail.com> [2010-04-26 12:25]:
> This is a fine advice - but unfortunately the ->param method
> call suffers from additional problem - which is described in
> much detail in the documentation (go to the NOTE at:
> http://search.cpan.org/~bobtfish/Catalyst-Runtime-5.80022/lib/Catalyst/Request.pm#$req-%3Eparam).

Yeah, but the ->params hash has the converse problem: if you

    $c->model->insert_person( name => $c->req->params->{'name'} )

then you may be surprised to find out there are people with name
like ARRAY(0xDEADBEEF). Of course that’s just a relatively minor
case of data corruption. Worse is if you legitimately expect
a parameter to have one or more values, eg. a pile of checkboxes.
Then you have to constantly check whether you’re getting a scalar
or an array reference.

So either you use the legacy method and have to protect against
getting more values than you wanted, or you use the suggested
method and have to protect against getting fewer values than you
expect in the general case.

I briefly tried to write something to stick Hash::MultiValue into
Catalyst to end the madness, but doing it properly would require
a plugin, plus HTTP::BodyParser (I think) was using a misdesigned
approach that made deep integration of H::MV impossible (with
properly preserved k/v pair order).

Could have written a Request role… but that seemed unsatisfying.

I wonder whether it would be possible to rip out the respective
bits from Cat and use just H::MV, and leave the current stuff to
a compat plugin or something like that…

Aristotle Pagaltzis // <http://plasmasturm.org/>

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