By reading https://metacpan.org/pod/Mouse::Util::TypeConstraints documentation i felt into the trap and spent good amount of time trying to figure out why following code is not working:
package A;
use Mouse;
use Mouse::Util::TypeConstraints;
subtype 'MultiInt' => as 'ArrayRef[Int]';
coerce 'MultiInt' => from 'Int' => via { [ $_ ] };
has 'a' => ('is' => 'ro', 'isa' => 'MultiInt');and A->new( 'a' => 1 ) was throwing me this error:
Attribute (a) does not pass the type constraint because: Validation failed for 'MultiInt' with value 1 at
...
Fix:
This documentation page should mention, that coerce should be explicitly requested in attribute definition: has 'a' => ('is' => 'ro', 'isa' => 'MultiInt', 'coerce' => 1);. Good example is Moose documentation that says is explicitly: Moose will never try to coerce a value unless you explicitly ask for it. This is done by setting the coerce attribute option to a true value. While in Mouse this important piece of information is not mentioned in Mouse::Util::TypeConstraints nor Moose::Manual::Attributes doc.
By reading https://metacpan.org/pod/Mouse::Util::TypeConstraints documentation i felt into the trap and spent good amount of time trying to figure out why following code is not working:
and
A->new( 'a' => 1 )was throwing me this error:Fix:
This documentation page should mention, that coerce should be explicitly requested in attribute definition:
has 'a' => ('is' => 'ro', 'isa' => 'MultiInt', 'coerce' => 1);. Good example is Moose documentation that says is explicitly: Moose will never try to coerce a value unless you explicitly ask for it. This is done by setting the coerce attribute option to a true value. While in Mouse this important piece of information is not mentioned in Mouse::Util::TypeConstraints nor Moose::Manual::Attributes doc.