在 Catalyst 控制器中处理可选 url 参数的最佳方法是什么? [英] what is the best way to hanlde optional url arguments in a Catalyst controller?

问题描述

例如:

我知道如何匹配www.domain.com/foo/21

sub foo : Path('/foo') Args(1) {
  my ( $self, $c, $foo_id ) = @_;
  # do stuff with foo
}

但是我如何匹配 www.domain.com/foo/21 或 www.domain.com/foo/21/bar/56 ?

But how can I match www.domain.com/foo/21 OR www.domain.com/foo/21/bar/56 ?

sub foo : <?> {
  my ( $self, $c, $foo_id, $bar_id ) = @_;
  # do stuff with foo, and maybe do some things with bar if present
}

谢谢

更新:按照 Daxim 的建议，我尝试使用 :Regex

Update: Following Daxim's suggestion, I tried to use :Regex

sub foo : Regex('foo/(.+?)(?:/bar/(.+))?') {
   my ( $self, $c ) = @_;
   my ( $foo_id, $bar_id ) = @{ $c->req->captures };
}

但这似乎不起作用；url 匹配，但 $bar_id 总是 undef.如果我从正则表达式的末尾删除可选操作符，那么它确实会正确捕获 $bar_id，但是必须同时存在 foo 和 bar 才能获得 url 匹配.我不确定这是 perl 正则表达式问题还是 Catalyst 问题.有什么想法吗?

But this doesn't seem to work; the url is matched, but $bar_id is always undef. If I remove the optional opperator from the end of the regex then it does capture $bar_id correctly, but then both foo and bar must be present to get a url match. I'm not sure if this is a perl regex issue, or a Catalyst issue. Any ideas?

更新:

正如 Daxim 指出的那样，这是一个正则表达式问题.我不明白为什么上面的正则表达式不起作用，但我确实找到了一个:

As Daxim points out, its a regex issue. I can't see why the above regex doesn't work, but I did manage to find one that does:

sub foo : Regex('foo/([^/]+)(?:/bar/([^/]+))?') {
   my ( $self, $c ) = @_;
   my ( $foo_id, $bar_id ) = @{ $c->req->captures };
}

(我没有像 Daxim 那样在捕获中使用 \d+，因为我的 ID 可能不是数字)

(I didn't use \d+ in the captures like Daxim did as my ids might not be numeric)

感谢大家的帮助和建议，我学到了很多关于在 Catalyst 中处理 url 的知识 :D

Thanks all for the help and suggestions, I learnt a lot about handling urls in Catalyst :D

推荐答案

查看Catalyst::Manual::Intro#Action_types.

尼克写道:

我不确定这是 perl 正则表达式问题还是 Catalyst 问题.有什么想法吗?

I'm not sure if this is a perl regex issue, or a Catalyst issue. Any ideas?

简单地尝试一下怎么样?

How about simply trying it out?

repl>>> $_ = '/foo/21/bar/56'
/foo/21/bar/56

repl>>> m|foo/(\d+)(?:/bar/(\d+))?|
$VAR1 = 21;
$VAR2 = 56;

repl>>> $_ = '/foo/21'
/foo/21

repl>>> m|foo/(\d+)(?:/bar/(\d+))?|
$VAR1 = 21;
$VAR2 = undef;

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