webgen users - Jun 2012 - How to use only some nodes of an erb hash?

Hello,

I am trying to adapt the blog extension by Matteo Collina and Damien
Pollet to my needs. After a lot of trial and error most of it works.

Now I am trying to get some parts from the blog pages to show up in the
sidebar, using some code by Damien Pollet [1]:

<%
  pages = context.content_node.tree.node_access[:alcn].select{
|alcn,no| alcn =~ /\d{4}\/.*\.blog/ && no.is_file? }
  pages = pages.collect{ |na,no| no}.sort{ |a,b| b[''date'']
<=> a[''date''] }
  pages.each do |node|
%>
... display stuff from the entry?
<% end %>

It works, but I wonder if there is any way to restrict the number of
shown nodes, e.g. the titles of the three most recent ones? I''m not a
programmer and didn''t have any former knowledge of ruby or erb, but I
think I have to replace the each-do-loop with something different---but
what? Can someone please point me in the right direction?

Kind regards,

Frank


[1]
<http://rubyforge.org/pipermail/webgen-users/2009-November/000581.html>

On 2012-06-24 21:45 +0200 Frank Ellebrecht wrote:
> <%
>   pages = context.content_node.tree.node_access[:alcn].select{
> |alcn,no| alcn =~ /\d{4}\/.*\.blog/ && no.is_file? }
>   pages = pages.collect{ |na,no| no}.sort{ |a,b|
b[''date''] <=>
> a[''date''] } pages.each do |node|
> %>
> ... display stuff from the entry?
> <% end %>
> 
> It works, but I wonder if there is any way to restrict the number of
> shown nodes, e.g. the titles of the three most recent ones? I''m
not a
> programmer and didn''t have any former knowledge of ruby or erb,
but I
> think I have to replace the each-do-loop with something
> different---but what? Can someone please point me in the right
> direction?
Instead of `pages.each do |node|` use either

* `pages[0...3].each do |node|` for the first three pages or
* `pages[-3..-1].each do |node|` for the last three pages

Best regards,
  Thomas

Hi Thomas,

It works! Thanks a lot.

More questions still to come ...

Kind regards,

Frank

Am 25.06.2012 11:03, schrieb Thomas Leitner:
> On 2012-06-24 21:45 +0200 Frank Ellebrecht wrote:
>> <%
>>   pages = context.content_node.tree.node_access[:alcn].select{
>> |alcn,no| alcn =~ /\d{4}\/.*\.blog/ && no.is_file? }
>>   pages = pages.collect{ |na,no| no}.sort{ |a,b|
b[''date''] <=>
>> a[''date''] } pages.each do |node|
>> %>
>> ... display stuff from the entry?
>> <% end %>
>>
>> It works, but I wonder if there is any way to restrict the number of
>> shown nodes, e.g. the titles of the three most recent ones?
I''m not a
>> programmer and didn''t have any former knowledge of ruby or
erb, but I
>> think I have to replace the each-do-loop with something
>> different---but what? Can someone please point me in the right
>> direction?
> 
> Instead of `pages.each do |node|` use either
> 
> * `pages[0...3].each do |node|` for the first three pages or
> * `pages[-3..-1].each do |node|` for the last three pages
> 
> Best regards,
>   Thomas