在其他角色上实施要求不起作用？

Question

我的第一个角色如下：

package AccBack::RTransaction;

use strict;
use warnings;

use Moose::Role;
use MooseX::Method::Signatures;

requires "_log";
requires "_config";

我的第二个角色实现了第一个角色，如下：

package AccBack::RAccounting;

use AccBack::RTransaction;

requires "_log";

has "_config"            => (
    isa         => "Accounting::Config",
    is          => "ro",
    lazy        => 1,
    default     => sub { return Accounting::Config->new(); }
);

has "fibu"              => (
    isa         => "Maybe[Accounting::Fibu]",
    is          => "rw",
    writer      => "setFibu",
    reader      => "getFibu",
    default     => undef,
);

with "AccBack::RTransaction";

我的基类如下：

package AccBack::Membership;

use AccBack::RAccounting;

has "_log"              => (
    isa         => "Log::Log4perl::Logger",
    is          => "ro",
    default     => sub { 
        return Log::Log4perl->get_logger("AccBack::Membership");
    }
);

has "mailMergeOption"  => (
    isa         => "Maybe[HashRef]",
    is          => "rw",
    writer      => "setMailMergeOption",
    reader      => "getMailMergeOption",
    default     => undef,
);

# Roles
with "AccBack::RAccounting";

如果我不想启动我的程序，则会收到此错误：

“AccBack::RAccounting”需要实现“_config”方法 通过“AccBack::会员资格” C:/strawberry/perl/site/lib/Moose/Meta/Role/Application/ToCla

我不明白问题出在哪里。它与 http:// 相同search.cpan.org/~doy/Moose-2.0203/lib/Moose/Cookbook/Roles/Recipe1.pod。

有人知道我误解了什么吗？

Answer 1

这是一个已知问题，有望在将来得到解决。同时，您应该能够通过添加如下的存根方法来满足第二个角色的要求：

sub _config;
has "_config"            => (
    isa         => "Accounting::Config",
    is          => "ro",
    lazy        => 1,
    default     => sub { return Accounting::Config->new(); }
);

存根子方法将满足要求，但不会妨碍角色应用。