[Catalyst] Global 'helper' methods

Tomas Doran bobtfish at bobtfish.net
Tue Oct 30 22:33:49 GMT 2012

On 30 Oct 2012, at 14:03, Craig Chant wrote:

> So it seems it’s OK to whack them in the main MyApp.pm , here is an example of what is currently in a ‘MemberGlobs.pm’, which is ‘required’ in 90% of all the perl scripts.


> I’m forever having to switch between UK dates and USA dates so have helper methods.
> Where do these go?

The example function was immutable, and side effect free.

As such, it's purely functional, and thus I'd import it (i.e. write a module which just exported functions, and export it from there).

> Also where do you put application global constants?

How constant is constants?

If it's configurable, it comes from the config file!

If it's a real constant (as per the functions above), same situation applies.

However, I'd suggest that if you need functions such as this, your entire approach is broken! You should be inflating all dates and times into DateTime objects, and then using a correctly configured DateTime::Formatter::XXX to format them as appropriate for the output context.

This would mean that you'd set the date format generically for a user / page / whatever granularity you want, and you'd do conversion in one or two places - thus supporting the DRY principle, and allowing you to be much more flexible in future, when you need other date/time output formats.


More information about the Catalyst mailing list