Hi Kamil,
Your solution is mostly correct - what you need is the Defer feature:
https://metacpan.org/module/Mason::Plugin::Defer
This allows you to defer the computation of certain output until the very end
of the request.
In your autohandler, just do this:
<title><% $m->defer(sub { $self->title }) %></title>
or alternatively
% $.Defer {{
<% $self->title %>
% }}
So that $self->title won't be computed until after it has been set in the page.
This feature is powerful but kind of hidden in the docs, I need to remedy this.
Hope that helps!
Jon
On Jul 15, 2012, at 1:53 PM, Kamil Niechajewicz wrote:
> Hello,
>
> In our upcoming project we've decided to give Mason 2.0 a go - we'll be
> completly rewritting pretty big web portal with over 10 years of history
> which had previously been written in old Mason/mod_perl.
>
> I checked documentation and I really like the direction of 2.0 version, but
> considering our needs I have one important question: biggest problem with old
> Mason was using infromation from top page component (the one which was
> accessed from browser, like index.m) in upper "wrappers" that decided on
> things like meta data, HTML header and base layout.
>
> To give an example (pardon pseudo code but I just want to make it clear as
> quick as possible) in Mason 1.x:
>
> ----------------------------------------
> /index.m
> <%init>
> my $article = Article::get_article(...);
> my $title = "Article: " . $article->{title};
> </%init>
> <h1><% $article->{title}</h1>
> <% $article->{body} %>
>
>
> ----------------------------------------
> /autohandler
> <%init>
> my $title = "Default title";
> </%init>
> <html>
> <head>
> <title><% $title %></title> // $title should be either default or
> // overriden by base components like index.m
> </head>
> <body>
> <% $m->call_next %>
>
> In Mason 1.x it was quite hard (if not impossible) to get that $title from
> base component (index.m) up to autohandler which required that information to
> set up <title></title> of web page. <%attr> block worked a bit like this, but
> it was static and could not be changed depending on some logic (like setting
> title of fetched article etc.)
>
> My question is - how can this be achieved in Mason 2.0 - I suppose that
> having components as classes help here a lot? I couldn't find the exact
> example of such "passing" of attributes. If Base.mc is some kind of
> autohandler (if I'm correct) then it will become a parent of index.mc
> component, right? If so, can I define
>
> /Base.mc
> <%class>
> has 'title'
> </%class>
> <html>
> <head>
> <title><% $self->title %></title>
> </head>
> <body>
> <% inner() %>
>
> and then in index.mc do this:
>
> /index.mc
> <%init>
> $self->title('New title');
> </%init>
>
> And it will cause the Base.mc component class to display the title set by its
> child? Or should we approach this more in a OO manner defining some virtual
> method in Base.mc like GetPageTitle() and override it in other components
> with a method returning a specific title?
>
> I'd be really grateful for some short examples of good practices of doing
> this in Mason 2.0 :)
>
> Thanks,
>
> KN
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