Template::Plugin::AsseUserpContributed Perl DocumTemplate::Plugin::Assert(3pm)
NAME
Template::Plugin::Assert - trap undefined values
SYNOPSIS
[% USE assert %]
# throws error if any undefined values are returned
[% object.assert.method %]
[% hash.assert.key %]
[% list.assert.item %]
DESCRIPTION
This plugin defines the "assert" virtual method that can be used to
automatically throw errors when undefined values are used.
For example, consider this dotop:
[% user.name %]
If "user.name" is an undefined value then TT will silently ignore the
fact and print nothing. If you "USE" the "assert" plugin then you can
add the "assert" vmethod between the "user" and "name" elements, like
so:
[% user.assert.name %]
Now, if "user.name" is an undefined value, an exception will be thrown:
assert error - undefined value for name
AUTHOR
Andy Wardley <abw@wardley.org> <http://wardley.org/>
COPYRIGHT
Copyright (C) 2008 Andy Wardley. All Rights Reserved.
This module is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
SEE ALSO
Template::Plugin
perl v5.36.0 2022-10-20 Template::Plugin::Assert(3pm)
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