[Catalyst] TT via AJAX

[Roland Philibert]

Hi Will,

Thanks for this, am not sure I understand though..

I don't really want to re-build the datastructure as the resultset $rs cont=
ains all relationships used by the template.

What I want to achieve is send back $body (from my rendered TT) via JSON ba=
ck to my $.ajax.

Any example on how to this and I'd be very grateful.

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Thanks.

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From: will trillich [mailto:will.trillich at serensoft.com] =

Sent: 25 April 2012 14:53
To: The elegant MVC web framework
Subject: Re: [Catalyst] TT via AJAX

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Roland --

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

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

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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.

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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 arr=
ayrefs when needed) instead of asking JSON to translate blessed objects tha=
t are dozens of layers deep.

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

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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 );

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

Hello all,

I'd like to render some HTML content being formatted from a  TT view via AJ=
AX.
Can anybody recommend a way to do that please?

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The method I am using now for AJAX  is REST controller and JSON View.

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...

sub ajaxaction :Local :ActionClass('REST') {}

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sub ajaxaction _GET {

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                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");

}

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..but doing this I get the error:

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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."

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Thanks for your help.

Roland

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