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Catalyst::View::TT::Alloy(3) User Contributed Perl Documentation Catalyst::View::TT::Alloy(3)

Catalyst::View::TT::Alloy - Template::Alloy (TT) View Class

version 0.00007

# use the helper to create your View view TT::Alloy TT::Alloy

# configure in myapp.yml

        - __path_to(root/src)__
        - __path_to(root/lib)__
      PRE_PROCESS: 'config/main'
      WRAPPER: 'site/wrapper'
      # optional
      CATALYST_VAR: 'Catalyst'

# example render view in lib/MyApp/Controller/

    sub default : Private {
        my ( $self, $c ) = @_;
        $c->stash->{template} = 'message.tt2';
        $c->stash->{message}  = 'Hello World!';

    sub end : ActionClass('RenderView') {

# access variables from template

    The message is: [% message %].

    # example when CATALYST_VAR is set to 'Catalyst'
    Context is [% Catalyst %]
    The base is [% Catalyst.req.base %]
    The name is [% %]

    # example when CATALYST_VAR isn't set
    Context is [% c %]
    The base is [% base %]
    The name is [% name %]

This is the Catalyst view for the TT emulator Template::Alloy.

Your application should define a view class which is a subclass of this module. The easiest way to achieve this is using "script/" (replacing "myapp" with the name of your application).

    $ script/ view TT::Alloy TT::Alloy

You can either manually forward to the "TT::Alloy" as normal, or use Catalyst::Action::RenderView to do it for you.

    # In MyApp::Controller::Root

    sub end : ActionClass('RenderView') { }

Template::Alloy is a pure-perl module which emulates most common features of TT, and in some cases is faster too. See Template::Alloy::TT for details of which features are missing.

Catalyst::View::TT::Alloy is generally compatible with Catalyst::View::TT. The "TIMER" configuration option isn't supported, and the "paths()" alias to "include_path()" has been removed.

Although Template::Alloy emulates several other templating modules, the interface differs for each one. For this reason, this module only provides the TT interface.

Sometimes it is desirable to modify INCLUDE_PATH for your templates at run time.

Additional paths can be added to the start of INCLUDE_PATH via the stash as follows:

    $c->stash->{additional_template_paths} =
        [$c->config->{root} . '/test_include_path'];

If you need to add paths to the end of INCLUDE_PATH, there is also an include_path() accessor available:

    push( @{ $c->view('TT')->include_path }, qw/path/ );

Note that if you use include_path() to add extra paths to INCLUDE_PATH, you MUST check for duplicate paths. Without such checking, the above code will add "path" to INCLUDE_PATH at every request, causing a memory leak.

A safer approach is to use include_path() to overwrite the array of paths rather than adding to it. This eliminates both the need to perform duplicate checking and the chance of a memory leak:

    $c->view('TT')->include_path([ qw/ path another_path / ]);

If you are calling "render" directly then you can specify dynamic paths by having a "additional_template_paths" key with a value of additonal directories to search. See "CAPTURING TEMPLATE OUTPUT" for an example showing this.

The view plugin renders the template specified in the "template" item in the stash.

    sub message : Global {
        my ( $self, $c ) = @_;

        $c->stash->{template} = 'message.tt2';


If "template" isn't defined, then it builds the filename from "Catalyst/action" and the "TEMPLATE_EXTENSION" config setting. In the above example, this would be "message".

The items defined in the stash are passed to Template::Alloy for use as template variables.

    sub default : Private {
        my ( $self, $c ) = @_;
        $c->stash->{template} = 'message.tt2';
        $c->stash->{message}  = 'Hello World!';

A number of other template variables are also added:

    c      A reference to the context object, $c
    base   The URL base, from $c->req->base()
    name   The application name, from $c->config->{ name }

These can be accessed from the template in the usual way:


    The message is: [% message %]
    The base is [% base %]
    The name is [% name %]

The output generated by the template is stored in "$c->response->body".

If you wish to use the output of a template for some other purpose than displaying in the response, e.g. for sending an email, this is possible using Catalyst::Plugin::Email and the render method:

  sub send_email : Local {
    my ($self, $c) = @_;

      header => [
        To      => 'me@localhost',
        Subject => 'A TT Email',
      body => $c->view('TT::Alloy')->render($c, '', {
        additional_template_paths => [ $c->config->{root} . '/email_templates'],
        email_tmpl_param1 => 'foo'
  # Redirect or display a message

The constructor for the TT::Alloy view.
Renders the template specified in "$c->stash->{template}" or "$c->action" (the private name of the matched action. Calls "render" to perform actual rendering. Output is stored in "$c->response->body".
Arguments: ($c, $template, \%args)

Renders the given template and returns output, or croaks on error.

The template variables are set to %$args if $args is a hashref, or $"$c->stash" otherwise. In either case the variables are augmented with "base" set to " << $c-"req->base >>, "c" to $c and "name" to "$c->config->{name}". Alternately, the "CATALYST_VAR" configuration item can be defined to specify the name of a template variable through which the context reference ($c) can be accessed. In this case, the "c", "base" and "name" variables are omitted.

This method allows your view subclass to pass additional settings to the TT configuration hash, or to set the options as below:
Allows you to change the name of the Catalyst context object. If set, it will also remove the base and name aliases, so you will have access them through <context>.

For example:

        name     => 'MyApp',
        root     => MyApp->path_to('root'),
        'View::TT::Alloy' => {
            CATALYST_VAR => 'Catalyst',


    The base is [% Catalyst.req.base %]
    The name is [% %]
A sufix to add when building the template name, when "$c->stash->{template}" is not set.

For example:

  package MyApp::Controller::Test;
  sub test : Local { .. }

Would by default look for a template in "<root>/test/test".

If you set TEMPLATE_EXTENSION to '.tt', it will look for "<root>/test/".

The Catalyst::Helper::View::TT::Alloy module is provided to create your view module. It is invoked by the "" script:

    $ script/ view TT::Alloy TT::Alloy

Catalyst Mailing List:



Catalyst, Catalyst::Helper::View::TT::Alloy, Template::Alloy

Carl Franks, ""

Based on the code of "Catalyst::View::TT", by

Sebastian Riedel, ""

Marcus Ramberg, ""

Jesse Sheidlower, ""

Andy Wardley, ""

Moritz Onken, ""

Dean Hamstead ""

This program is free software, you can redistribute it and/or modify it under the same terms as Perl itself.
2015-03-29 perl v5.32.1

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