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MooseX::Params::Validate(3)          User Contributed Perl Documentation         MooseX::Params::Validate(3)



NAME
       MooseX::Params::Validate - an extension of Params::Validate using Moose's types

VERSION
       version 0.16

SYNOPSIS
         package Foo;
         use Moose;
         use MooseX::Params::Validate;

         sub foo {
             my ( $self, %params ) = validated_hash(
                 \@_,
                 bar => { isa => 'Str', default => 'Moose' },
             );
             return "Hooray for $params{bar}!";
         }

         sub bar {
             my $self = shift;
             my ( $foo, $baz, $gorch ) = validated_list(
                 \@_,
                 foo   => { isa => 'Foo' },
                 baz   => { isa => 'ArrayRef | HashRef', optional => 1 },
                 gorch => { isa => 'ArrayRef[Int]', optional => 1 }
             );
             [ $foo, $baz, $gorch ];
         }

DESCRIPTION
       This module fills a gap in Moose by adding method parameter validation to Moose. This is just one of
       many developing options, it should not be considered the "official" one by any means though.

       You might also want to explore "MooseX::Method::Signatures" and "MooseX::Declare".

CAVEATS
       It is not possible to introspect the method parameter specs; they are created as needed when the
       method is called and cached for subsequent calls.

EXPORTS
       validated_hash( \@_, %parameter_spec )
           This behaves similarly to the standard Params::Validate "validate" function and returns the
           captured values in a HASH. The one exception is where if it spots an instance in the @_, then it
           will handle it appropriately (unlike Params::Validate which forces you to shift you $self first).

           The values in @_ can either be a set of name-value pairs or a single hash reference.

           The %parameter_spec accepts the following options:

           isa The "isa" option can be either; class name, Moose type constraint name or an anon Moose type
               constraint.

           does
               The "does" option can be either; role name or an anon Moose type constraint.

           default
               This is the default value to be used if the value is not supplied.

           optional
               As with Params::Validate, all options are considered required unless otherwise specified.
               This option is passed directly to Params::Validate.

           coerce
               If this is true and the parameter has a type constraint which has coercions, then the
               coercion will be called for this parameter. If the type does have coercions, then this
               parameter is ignored.

           This function is also available under its old name, "validate".

       validated_list( \@_, %parameter_spec )
           The %parameter_spec accepts the same options as above, but returns the parameters as positional
           values instead of a HASH. This is best explained by example:

             sub foo {
                 my ( $self, $foo, $bar ) = validated_list(
                     \@_,
                     foo => { isa => 'Foo' },
                     bar => { isa => 'Bar' },
                 );
                 $foo->baz($bar);
             }

           We capture the order in which you defined the parameters and then return them as a list in the
           same order. If a param is marked optional and not included, then it will be set to "undef".

           The values in @_ can either be a set of name-value pairs or a single hash reference.

           Like "validated_hash", if it spots an object instance as the first parameter of @_, it will
           handle it appropriately, returning it as the first argument.

           This function is also available under its old name, "validatep".

       pos_validated_list( \@_, $spec, $spec, ... )
           This function validates a list of positional parameters. Each $spec should validate one of the
           parameters in the list:

             sub foo {
                 my $self = shift;
                 my ( $foo, $bar ) = pos_validated_list(
                     \@_,
                     { isa => 'Foo' },
                     { isa => 'Bar' },
                 );

                 ...
             }

           Unlike the other functions, this function cannot find $self in the argument list. Make sure to
           shift it off yourself before doing validation.

           The values in @_ must be a list of values. You cannot pass the values as an array reference,
           because this cannot be distinguished from passing one value which is itself an array reference.

           If a parameter is marked as optional and is not present, it will simply not be returned.

           If you want to pass in any of the cache control parameters described below, simply pass them
           after the list of parameter validation specs:

             sub foo {
                 my $self = shift;
                 my ( $foo, $bar ) = pos_validated_list(
                     \@_,
                     { isa => 'Foo' },
                     { isa => 'Bar' },
                     MX_PARAMS_VALIDATE_NO_CACHE => 1,
                 );

                 ...
             }

ALLOWING EXTRA PARAMETERS
       By default, any parameters not mentioned in the parameter spec cause this module to throw an error.
       However, you can have have this module simply ignore them by setting "MX_PARAMS_VALIDATE_ALLOW_EXTRA"
       to a true value when calling a validation subroutine.

       When calling "validated_hash" or "pos_validated_list" the extra parameters are simply returned in the
       hash or list as appropriate. However, when you call "validated_list" the extra parameters will not be
       returned at all. You can get them by looking at the original value of @_.

EXPORTS
       By default, this module exports the "validated_hash", "validated_list", and "pos_validated_list".

       If you would prefer to import the now deprecated functions "validate" and "validatep" instead, you
       can use the ":deprecated" tag to import them.

IMPORTANT NOTE ON CACHING
       When a validation subroutine is called the first time, the parameter spec is prepared and cached to
       avoid unnecessary regeneration. It uses the fully qualified name of the subroutine (package +
       subname) as the cache key.  In 99.999% of the use cases for this module, that will be the right thing
       to do.

       However, I have (ab)used this module occasionally to handle dynamic sets of parameters. In this
       special use case you can do a couple things to better control the caching behavior.

       •   Passing in the "MX_PARAMS_VALIDATE_NO_CACHE" flag in the parameter spec this will prevent the
           parameter spec from being cached.

             sub foo {
                 my ( $self, %params ) = validated_hash(
                     \@_,
                     foo                         => { isa => 'Foo' },
                     MX_PARAMS_VALIDATE_NO_CACHE => 1,
                 );

             }

       •   Passing in "MX_PARAMS_VALIDATE_CACHE_KEY" with a value to be used as the cache key will bypass
           the normal cache key generation.

             sub foo {
                 my ( $self, %params ) = validated_hash(
                     \@_,
                     foo                          => { isa => 'Foo' },
                     MX_PARAMS_VALIDATE_CACHE_KEY => 'foo-42',
                 );

             }

MAINTAINER
       Dave Rolsky <autarch@urth.org>

BUGS
       Please submit bugs to the CPAN RT system at
       http://rt.cpan.org/NoAuth/ReportBug.html?Queue=moosex-params-validate or via email at
       bug-moosex-params-validate@rt.cpan.org.

AUTHOR
       Stevan Little <stevan.little@iinteractive.com>

COPYRIGHT AND LICENSE
       This software is copyright (c) 2011 by Stevan Little <stevan.little@iinteractive.com>.

       This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5
       programming language system itself.



perl v5.12.5                                     2011-01-29                      MooseX::Params::Validate(3)