[Templates] Re: Array to hash with 1 result

[Ryan Blomberg]

Sergey and Cees,

Sergey, I am using 2.18 as well.. but discovered why it is happening.

Due to perl not being strong typed a subroutine can return whatever  
it wants (scalar,hash,array,reference).

TT tries to guess what was returned so that is in the correct context  
by doing the following:

my @return = &function(@args);

if(scalar(@return) > 1) {
	assume array of stuff
} else {
	return $return[0];
}

It does that because doing the following would break things:

my $return = &function(@args); (would only get first key or first  
element if an array or hash is returned)

But, doing it this way means they make a guess in the case of arrays  
and hashes that yields my issue.

As Cees explained.. the best way to fix this is to always return  
references or scalars from your subs and never arrays or hashes.

We return arrays and hashes in more places than I would like to admit  
though so we will probably just avoid calling object subroutines in  
templates.

rb

I am using 2.18 as well.

On Jul 7, 2007, at 6:33 AM, Sergey Martynoff wrote:

>
>> my template does the following
>>
>> [% FOREACH thing IN object.list_things() %]
>>    The name of the thing is [% thing.name %]
>> [% END %]
>>
>> If the function returns
>>
>> return [ { name => 'test' } ];
>>
>> I get not output and dumping the result of the function yields $VAR1
>> = { name => 'test' } instead of the expected $VAR1 = [ { name =>
>> 'test' } ]
>
> You are probably using an older version of Template Tookit. I  
> recall that
> there was such a problem formerly, but I cannot repeat this bug on  
> TT 2.18.
>
>
> -- 
> Sergey Martynoff
>
>
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