[英]How to access perl hash value (which is an array) from Template Toolkit?
I have assigned a hash in perl as follows: 我在perl中分配了一个哈希,如下所示:
my %myvers;
my @patches = ();
my @mypatches = ();
foreach my $myv ( @{$product->versions} ){
@patches = set_patches($myv->id); #get the array of patches for the version
foreach(@patches) {
push @mypatches,@{$_};
}
$myvers{$myv->name} = @mypatches;
}
$vars->{'myvers'} = \%myvers;
When I access the hash in html template with the code below: 当我使用以下代码访问html模板中的哈希值时:
[% FOREACH key IN myvers.keys %]
alert('[% key %] is [% myvers.$key %]; ');
[% END %]
key contains the keys and $key contains the number of elements in the array for each key assigned above. key包含键, $ key包含上面分配的每个键的数组中的元素数。
I cannot access the values of elements of the array. 我无法访问数组元素的值。 How can I do that ?
我怎样才能做到这一点 ?
The problem is you don't store the elements, you only store the size. 问题是您不存储元素,仅存储大小。
$myvers{ $myv->name } = @mypatches;
Assigning to a hash value forces a scalar context, so @mypatches
returns the size of the array. 分配给哈希值会强制执行标量上下文,因此
@mypatches
返回数组的大小。 You need to store a reference to the array instead: 您需要存储对数组的引用:
$myvers{ $myv->name } = [ @mypatches ];
It's probably more common to declare the array inside the outer loop and use a reference. 在外部循环中声明数组并使用引用可能更常见。 In fact, you can skip pushing the elements one by one, as you can push the whole array:
push @mypatches, @patches
, but then, you don't need two arrays at all: 实际上,您可以跳过一个元素一个一个地推送元素,因为您可以推送整个数组:
push @mypatches, @patches
,但是然后,您根本不需要两个数组:
my %myvers;
for my $myv (@{ $product->versions }) {
my @patches = set_patches($myv->id);
$myvers{ $myv->name } = \@patches;
}
$vars->{myvers} = \%myvers;
or, if you really want to be laconic: 或者,如果您真的想简洁:
$myvers{ $_->name } = [ set_patches($_->id) ] for @{ $product->versions };
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