[Templates] Re: Array to hash with 1 result

[Ryan Blomberg]

The problem with that is that you have to get your ui guys to  
remember to add the _ref

It is more likely that they will forget and will not test for the  
single element array case and it will
come back to bite you.  For now we will follow the convention of  
separating our data model from
the view (some would argue this is the correct thing to do anyway).

rb

On Jul 9, 2007, at 11:09 AM, Bill Ward wrote:

> You could add new methods to your object that return refs.  So if  
> you have
>
> sub function
> { .... return @something }
>
> then you could create an additional subroutine:
>
> sub function_ref
> {
>    my $self = shift;
>    my @something = $self->function(@_);
>    \@something;
> }
>
> Use the latter in your templates.
>
> On 7/9/07, Ryan Blomberg <rb@eventful.com> wrote:
>> 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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>> >
>>
>>
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>
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