[Catalyst] TT via AJAX

[will trillich]

Roland --

Assuming your JSON view is trying to encode the 'result' item from your
stash, first let's see why encoding a blessed object is fraught with peril.

Try running your server in debug mode, and when you get to the ->stash()
line, try "x $rs". You really want all that JSON-encoded?

Blessed objects (such as a recordset or a request or a response) typically
contain many, many layers that are often going to be overkill when encoding
stuff as JSON, when really you just want a few top-level items.

So you should iterate through your objects and/or collections and create a
hashref that contains plain primitives (or maybe a few more hashrefs or
arrayrefs when needed) instead of asking JSON to translate blessed objects
that are dozens of layers deep.

Instead of doing ...->stash( result =3D> [ $rs ] ) build your own data
structure, by doing something like

my $json =3D {
  data =3D> [],
  count=3D> $rs->count,
  other =3D> $self->blah,
};
while ( my $rec =3D $rs->next ) {
  my %fields =3D $self->get_important_values( $rec );
  push @{ $json->{data} }, { %fields );
}
$c->stash( result =3D> $json );



On Wed, Apr 25, 2012 at 8:26 AM, Roland Philibert <rphilibert at aptina.com>wr=
ote:

> Hello all,****
>
> I=92d like to render some HTML content being formatted from a  TT view via
> AJAX.
> Can anybody recommend a way to do that please?****
>
> ** **
>
> The method I am using now for AJAX  is REST controller and JSON View.****
>
> ** **
>
> ...****
>
> sub ajaxaction :Local :ActionClass('REST') {}****
>
> ** **
>
> sub ajaxaction _GET {****
>
> ** **
>
>                 my ($self, $c) =3D @_;****
>
>                 my $rs =3D  $c->model(DN)->resultset(Table)->find(...);**=
**
>
>                 my $body =3D
> $c->view(MYTT)->render($c,'dir/temp.mailtt',$c->stash( result  =3D> [ $rs=
 ]
> )); =DF this is the weird bit I guess.****
>
>                 my @content =3D();****
>
>                 push @content, $body;****
>
>                 $self->status_ok(****
>
>                         $c,****
>
>                         entity =3D> \@content,****
>
>                 );****
>
> }****
>
> sub end :Private {****
>
>         my ($self, $c) =3D @_;****
>
>         $c->forward("View::JSON");****
>
> }****
>
> ** **
>
> ..but doing this I get the error:****
>
> ** **
>
> Caught exception in MyApp::View::JSON->process "encountered object
> 'MyApp::Model::DB::Table=3DHASH(0xdb2c330)', but neither allow_blessed nor
> convert_blessed settings are enabled at (eval 1606) line 151."****
>
> ** **
>
> Thanks for your help.****
>
> Roland****
>
> ** **
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-- =

"We act as though comfort and luxury were the chief requirements of life,
when all that we need to make us happy is something to be enthusiastic
about." -- Albert Einstein
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