[Maypole] Multiple controllers

[Dave Howorth]

Vsevolod (Simon) Ilyushchenko wrote:
> How would I deal with the following, in Maypole or otherwise?

I'm not sure I've understood your question, so forgive me if I go off at 
a tangent.

> Suppose I have to enter a date on several web pages. I include a 
> template for displaying dates into the templates for my web pages, and I 
> have a DateController class that is created and owned by each page's 
> controller.

I'm not sure what the page controller is here? I guess the corresponding 
entity in Maypole would be the do_edit action of the page's model class? 
If so, the Model, View and StandardTemplate chapters of the manual have 
some explanation of how that works in Maypole.

> However, I have to exchange data (day/month/year) between the main model 
> instance and the the DateController instance. I am doing this pretty 
> haphazardly, and I wonder if someone wrote any standard ways of 
> accomplishing this.

For dates in particular, and also as an example of the general case, 
Maypole relies on the model's facilities (i.e. CDBI). You would pick a 
suitable class to model a date (Time::Piece is the usual example) and 
tell CDBI and friends to use it by calling has_a (see the Class::DBI 
docs) and untaint_columns (see Class::DBI::FromCGI and CGI::Untaint).

Maypole has the concept of component requests (i.e. bits of pages with 
different models etc) on output but AFAIK it doesn't have a standard way 
to do that on input. But you could easily code the top-level responding 
action to call component actions to deal with parts of the input. The 
interface would be by side-effect - changed state in the model - unless 
you wanted to code specific features into the method calls. But this 
sounds OK; going back to the object in the model that represents your 
date and asking it for its value seems like the right thing to do.

Cheers, Dave


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