[Catalyst] overload/override sub? (Session::PerUser)

[Matt S Trout]

On Mon, Aug 06, 2007 at 09:42:28PM +0100, Ash Berlin wrote:
> Fernan Aguero wrote:
> > Hi,
> > 
> > I'd like to overload (or would it be override?) the
> > merge_session_to_user sub in
> > Catalyst::Plugin::Session::PerUser to be able to guide the
> > hash merge (i.e. create new hash value keys for conflicting
> > keys).
> > 
> > Now, where and how should I do the overriding? Excuse my ignorance
> > ... but I've never done this and searching for 'Perl
> > overload' always gets me to instructions on how to overload
> > built-in operators ...
> > 
> > Thanks in advance,
> > 
> > Fernan
> 
> Redefine is the term in perl-lingua.

Not really, it's just subclassing. 

Catalyst plugins (like DBIC components) just end up as extra superclasses
 
> In MyApp.pm:
> 
> {
>   no warnings 'redefine';

# this line is completely pointless.

> 
>   sub merge_session_to_user {
>     # your new sub
> 
>     # ...
> 
>     # To call the previous implementation if you should want it:
>     # $self->NEXT::merge_session_to_user(@args);
>   }
> }
> 
> The key thing to remember here is that all Cat plugins 'pollute' the $c
> namespace, which isa Myapp.

They end up on your @ISA, this polluting the namespace of potential method
names, but they don't pollute the MyApp package directly - that level of
stupidity I haven't seen since Class::DBI::Plugin::*

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