这些是我的目标:
>关注Moose’Moose::Manual::BestPractices,特别是:
>使用namespace :: autoclean和
>使用__PACKAGE __-> Meta-> make_immutable.
>为Result和ResultSet使用公共基类
>当使用任何魔术技巧时都有一个解释它们的评论(在研究过程中,我发现了一个指导子建构的指南{$_ [2]}由don’t ask解释)
>移动公共代码,例如MooseX :: NonMoose(如有必要)或__PACKAGE __-> load_components,按照DBIx::Class::Manual::Cookbook的建议进入公共基类
这些是我遇到的问题:
>当使用__PACKAGE __-> Meta-> make_immutable时,我收到警告,比如没有为MyApp :: Schema :: Result :: MyTable内联’new’,因为它没有继承默认的Moose :: Object :: new
>将所有对__PACKAGE __-> load_components的调用移动到Result基类时,我的日期时间列没有被充气
解决方法
> make_immutable与非Moose新构造函数冲突:使用MooseX :: NonMoose自动处理;与其文件相比,不需要进一步的论据或选择;请注意,DBIx :: Class :: Schema没有新方法,因此MyApp :: Schema不需要这个帮助器
> InflateColumn :: DateTime在基类中加载时不膨胀:这是由赋予load_components()的组件顺序触发的;在文件中没有暗示订单应该重要,我已经提交了a bug report关于此;重新排序有帮助
使用上面的解决方案,我的示例DBIx :: Class模式与Moose看起来像这样:
架构类:
package MyApp::Schema;
use Moose; # we want Moose
use MooseX::MarkAsMethods autoclean => 1; # this helps removing unused symbols like Moose keywords
# do NOT 'use MooseX::NonMoose' here because Schema class has no 'new' method
extends 'DBIx::Class::Schema'; # the Moose way of inheritance
# load all table modules automatically
__PACKAGE__->load_namespaces(
# ResultSet class for tables without custom ResultSet class
# (would be DBIx::Class::ResultSet otherwise)
default_resultset_class => '+MyApp::Schema::ResultSet',);
# tell Moose this class is finished: some Moose stuff is removed and things go faster
__PACKAGE__->Meta->make_immutable;
1;
通用结果基类:
# a base class for all table class of this app
package MyApp::Schema::Result;
use Moose;
use MooseX::MarkAsMethods autoclean => 1;
use MooseX::NonMoose; # this is important for correctly handling DBIx::Class' new
extends 'DBIx::Class::Core';
# this is the right place to implement generic stuff
# DBIx::Class::Cookbook recommends loading components in a central place
__PACKAGE__->load_components(qw/
InflateColumn::DateTime
...
/);
__PACKAGE__->Meta->make_immutable;
1;
通用ResultSet基类:
package MyApp::Schema::ResultSet; use Moose; use MooseX::MarkAsMethods autoclean => 1; use MooseX::NonMoose; extends 'DBIx::Class::ResultSet'; __PACKAGE__->Meta->make_immutable; 1;
表my_table的示例ResultSet类:
package MyApp::Schema::ResultSet::MyTable;
use Moose;
use MooseX::MarkAsMethods autoclean => 1;
extends 'MyApp::Schema::ResultSet';
sub oldest {
my $self = shift;
$self->search({},{order_by => {-ASC => 'date'}})->first;
}
__PACKAGE__->Meta->make_immutable;
1;
表my_table的示例结果类:
package MyApp::Schema::Result::MyTable;
use Moose;
use MooseX::MarkAsMethods autoclean => 1;
extends 'MyApp::Schema::Result';
__PACKAGE__->table("my_table");
__PACKAGE__->add_columns(
id => {data_type => "integer",is_auto_increment => 1},date => {data_type => "date"},);
__PACKAGE__->set_primary_key("id");
__PACKAGE__->Meta->make_immutable;
1;