[Dancer-users] How to use dancer functions in other modules

Flavio Poletti polettix at gmail.com
Tue Mar 8 07:40:23 CET 2011


Hi,

   first of all you should import with the ":syntax" import option to avoid
some collateral effects that should happen only in the main module:

use Dancer ':syntax';

Second, looking at the code the import mechanism is quite bare-bones and
does not allow you to perform selective import. Considering that you have
control upon the module that needs Dancer, do you think that you can rename
your "sub params" in some other way? I think it should be better for you too
- having two "params" requires a switch of mental context at each edit file
change.

Cheers,

    Flavio.




On Tue, Mar 8, 2011 at 3:43 AM, Brian E. Lozier <brian at massassi.com> wrote:

> Well I think I hit "send" too soon.  The problem is that I have a
> "params" METHOD already defined in this form class.  When I import
> Dancer it seems to override that method.  Is there a way to only
> import the logging functions and not all the Dancer functions?
>
> Thanks!
>
> On Mon, Mar 7, 2011 at 6:40 PM, Brian E. Lozier <brian at massassi.com>
> wrote:
> > I have some modules for form generation and processing that aren't
> > Dancer classes (in that they don't contain any routes).  Inside these
> > I'd like to use some of the dancer functions like "params."  When I
> > "use Dancer" at the top of one of these modules I am getting a really
> > odd error message.
> >
> > runtime error
> >
> > Operation "eq": no method found,
> >        left argument in overloaded package Fan::Form::Register,
> >        right argument has no overloaded magic at
> > /usr/local/lib/perl5/site_perl/5.12.3/Dancer/Request.pm line 177.
> >
> > /usr/local/lib/perl5/site_perl/5.12.3/Dancer/Request.pm around line 177
> >
> > 174     return %{$self->{params}} if wantarray && @_ == 1;
> > 175     return $self->{params} if @_ == 1;
> > 176
> > 177     if ($source eq 'query') {
> > 178         return %{$self->{_query_params}} if wantarray;
> > 179         return $self->{_query_params};
> > 180     }
> >
> > In my main Dancer class, Fan::Web, I have a route sub that says:
> >
> > my $params = params();
> >
> > I then pass this hashref into my form module like this:
> >
> >   my $form = Fan::Form::Register->new($params);
> >
> > If I don't "use Dancer" in the form module, all works well.  If I "use
> > Dancer;" in the form module I get the error message.  I am trying to
> > use Dancer so I can use the debug/warning functions.  I don't
> > understand the error message.  I have an overloaded "" operator in the
> > form class (to return an HTML representation of the form) but I don't
> > know how calling the params() function in my main Dancer routes class
> > (Fan::Web) and then passing the hashref into my form class can cause
> > an error like this.  Any thoughts?
> >
> > Thanks,
> > Brian
> >
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