Question

我试图找出为什么我无法访问元素内部的祝福引用：

这是我的模块：

package Test::Node

__PACKAGE__->meta->setup(
    table   => 'node',

    columns => [
        id                             => { type => 'serial', not_null => 1 },
        name                           => { type => 'varchar', length => 128, not_null => 1 },
    ],

    primary_key_columns => [ 'id' ],

    relationships =>
    [ 
      alias =>
      { 
        type       => 'one to many',
        class       => 'Test::Alia',
        column_map => { id => 'asset_id' },
      },
],

这是我要求测试的子项：

sub SearchNode {
  my $self = shift;
  my ($opts) = shift;
  my %query = (name => { like => "$opts->{name}%"});
  my %object = (with_objects => ['alias']);
  $object{query} = [%query] if $opts->{name};

  my $records = Test::Node::Manager->get_node(%object);
  my $i = 0;  
  my $record = {}; 
  $record->{page} = 1;
  $record->{total} = 1;
  foreach (@$records) {
    my %items =(
      id => $_->id,
      name => $_->name,
      alias => $_->alias->alias
    );  
    $record->{rows}[$i] = \%items; 
    $i++;
  }   
  $record->{records} = $i; 
  return $record;
}

如果我使用$ _-＆gt;别名，我会收到以下内容：

$ ./search.pl 
$VAR1 = {
          'page' => 1,
          'records' => 1,
          'rows' => [
                      {
                        'name' => 'test.localhost.net',
                        'id' => '1234',
                        'alias' => bless( {
                                            'node_id' => '1234',
                                            'id' => '5678',
                                            'alias' => 'server1.localhost.net'
                                          }, 'Test::Alia' )
                      }
                    ],
          'total' => 1
        };

如果我使用$ _-＆gt; alias-＆gt; alias，我收到错误：

./search.pl 
Can't call method "alias" on unblessed reference at /usr/local/lib/perl/Test/Node.pm line 41.

由于Dumper输出显示Alias的值是有福的，这似乎与错误消息相矛盾，所以我很困惑。

Answer 1

Dumper输出显示$_->alias返回hash-ref，而不是对象。要访问结构中的别名对象，您需要以下内容：

$_->{rows}[0]{alias};

要访问该对象的别名方法：

$_->{rows}[0]{alias)->alias;

PERL |散列中的祝福对象|玫瑰：DB：对象

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