[dancer-users] Only even items

[Hugues Max]

yes, thanks,  this is clearer now
I'm going to sleep with aspirin.. :-)
good night
Hugues


Le 08/04/2013 21:50, David Precious a écrit :
> On Mon, 08 Apr 2013 21:39:45 +0200
> Hugues Max <huguesmax at gmail.com> wrote:
>
>> Thanks you, very much,  It's works
>>
>> but I not really understand why with hash , half of result go to keys
>> and other to values
> Basic Perl - a hash is defined as a list of key, value, key, value.
>
> You normally see it written as ( key => value ...), but "=>", the fat
> comma, is actually syntactically equivalent to a normal comma (with
> the exception of automatically quoting its left operand), it's just
> used in this case as it's clearer.
>
> So, the following two are equivalent:
>
> my %hash = ( foo => 'Bar' );
> my %hash = ( foo, 'Bar' );
>
> The second should make it a little clearer why assigning a list to a
> hash causes the behaviour you saw.
>
> A little further demonstration in the Perl debugger:
>
>    DB<1> @foo = qw(one two three four);
>    DB<2> x \@foo;
> 0  ARRAY(0xa3cb200)
>     0  'one'
>     1  'two'
>     2  'three'
>     3  'four'
>    DB<3> %hash = @foo;
>    DB<4> x \%hash
> 0  HASH(0xa45a508)
>     'one' => 'two'
>     'three' => 'four'
>
>
> Does that help make it clearer?
>
>
>> and how template toolkit do the relation between database fiels and
>> values  with simple list ?
>>
>> for my point of view , a simple "complet" example will be good idea
>> in documentation.
>> complet = perl part AND ttk part
> Well, the TT part is out of scope for D::P::D, as you could be using
> the data for any purpose.
>
> However, what you get is a list of hashrefs; iterating over that in TT
> tends to look like e.g.:
>
> [% FOR person IN people %]
>      Hi [% person.name %]!
> [% END %]
>
> Where "people" is the param name which contains the list of people.
>
> For a quick example having fetched it from a DB, e.g.:
>
>    get '/people' => sub {
>        my @people = database->quick_select('people', {});
>        return template 'people', { people => \@people };
>    };
>
>
> Hope that all helps make things clearer for you?
>
>