修饰符在服务对象下不可见

Question

鉴于以下情况：

• 哞2.001001;
• 面包::Board 0.34;
• Bread::Board 容器
• 基类Foo 带有属性str 和around 修饰符用于str
• 子类Bar 扩展Foo

问题：

• [GOOD] 从普通Bar 实例化对象时，会执行Foo::str 修饰符；
• [BAD] 从容器服务为Bar 实例化对象时，Foo::str 修饰符未执行；
• 在 [BAD] 发生后 [WORSE]，从普通的 Bar 实例化也不再有效；

代码示例：

#!/usr/qlc/apps/common/perl_5.18.2/bin/perl -w

package Foo;

use Moo;

has str => ( is => 'rw', default => '' );

sub BUILD {
    my ($self, $args) = @_;

    $self->str($self->str);
}

around str => sub {
    my ($orig, $self, $val) = @_;

    return $self->$orig unless defined $val;

    $self->$orig('prefix_'.$val);
};
# end of Foo



package Bar;

use Moo;

extends 'Foo';
# end of Bar



package main;

use 5.010;
use strictures 2;

use Bread::Board;

my $c = container 'MyApp' => as {
    service 'foo' => ( class => 'Foo', parameters => { str => { optional => 1 } } );
    service 'bar' => ( class => 'Bar', parameters => { str => { optional => 1 } } );
};


my $foo_plain = Foo->new({ str => 'foo_plain' });
say "foo_plain = ".$foo_plain->str;

my $foo_bb = $c->resolve( service => 'foo', parameters => { str => 'foo_bb' } );
say "foo_bb = ".$foo_bb->str;

$foo_bb->str('foo_bb_setter');
say "foo_bb_setter = ".$foo_bb->str;

my $foo_plain_after_bb = Foo->new({ str => 'foo_plain_after_bb' });
say "foo_plain_after_bb = ".$foo_plain_after_bb->str;


my $bar_plain = Bar->new({ str => 'bar_plain' });
say "bar_plain = ".$bar_plain->str;

my $bar_bb = $c->resolve( service => 'bar', parameters => { str => 'bar_bb' } );
say "bar_bb = ".$bar_bb->str;

$bar_bb->str('bar_bb_setter');
say "bar_bb_setter = ".$bar_bb->str;

my $bar_plain_after_bb = Bar->new({ str => 'bar_plain_after_bb' });
say "bar_plain_after_bb = ".$bar_plain_after_bb->str;


die;

输出：

foo_plain = prefix_foo_plain
foo_bb = prefix_foo_bb
foo_bb_setter = prefix_foo_bb_setter
foo_plain_after_bb = prefix_foo_plain_after_bb
bar_plain = prefix_bar_plain
bar_bb = bar_bb
bar_bb_setter = bar_bb_setter
bar_plain_after_bb = bar_plain_after_bb

请注意输出 bar_bb、bar_bb_setter 和 bar_plain_after_bb 不包含 prefix_ 字符串。

为什么？

Answer 1

这是 Bread::Board 中的一个错误。

固定在this commit。

谢谢@Yanick。