NAME¶
MooseX::OneArgNew - teach ->new to accept single, non-hashref arguments
VERSION¶
version 0.003
SYNOPSIS¶
In our class definition:
package Delivery;
use Moose;
with('MooseX::OneArgNew' => {
type => 'Existing::Message::Type',
init_arg => 'message',
});
has message => (isa => 'Existing::Message::Type', required => 1);
has to => (
is => 'ro',
isa => 'Str',
lazy => 1,
default => sub {
my ($self) = @_;
$self->message->get('To');
},
);
When making a message:
# The traditional way:
my $delivery = Delivery->new({ message => $message });
# or
my $delivery = Delivery->new({ message => $message, to => $to });
# With one-arg new:
my $delivery = Delivery->new($message);
DESCRIPTION¶
MooseX::OneArgNew lets your constructor take a single argument, which will be
translated into the value for a one-entry hashref. It is a parameterized role
with two parameters:
- type
- The Moose type that the single argument must be for the one-arg form to
work. This should be an existing type, and may be either a string type or
a MooseX::Type.
- init_arg
- This is the string that will be used as the key for the hashref
constructed from the one-arg call to new.
- coerce
- If true, a single argument to new will be coerced into the expected type
if possible. Keep in mind that if there are no coercions for the type,
this will be an error, and that if a coercion from HashRef exists, you
might be getting yourself into a weird situation.
WARNINGS¶
You can apply MooseX::OneArgNew more than once, but if more than one
application's type matches a single argument to "new", the behavior
is undefined and likely to cause bugs.
It would be a
very bad idea to supply a type that could accept a normal
hashref of arguments to "new".
AUTHOR¶
Ricardo Signes <rjbs@cpan.org>
COPYRIGHT AND LICENSE¶
This software is copyright (c) 2013 by Ricardo Signes.
This is free software; you can redistribute it and/or modify it under the same
terms as the Perl 5 programming language system itself.