[dancer-users] Only even items
Hugues Max
huguesmax at gmail.com
Mon Apr 8 20:57:06 BST 2013
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?
>
>
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