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Craig White

2006-Nov-19 04:49 UTC

sorting a hash in a view

I should be able to figure this out but perhaps I am brain dead...

I simply want to display the next id in sequence for a few
''categories''.

My view template is very basic...

<% for next_seq in @next_seq %>
   <%= next_seq[0] %> - <%= next_seq[1] %><br />
<% end %>

and I want them sorted in next_seq[0] order and since @next_seq is a
hash, it displays in a rather random order.

Not that this should matter, but the controller code for this looks like
this...

    @lib_cat = Valuelist.find(:all, 
      :conditions => ["list_name = ''Library
Categories''"],
      :order => ''list_value'')
    @next_seq = Hash.new
    for lib_cat in @lib_cat
      @next_seq[lib_cat.list_value] = Library.find(:first,
        :conditions => [''ltype = ?'', lib_cat.list_value], 
        :order => ''id DESC'').id + 1
    end

I''m not doing a ''select'' so I can''t do the
normal collect_for_selection
thingy

Craig


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Alex Wayne

2006-Nov-19 06:02 UTC

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Re: sorting a hash in a view

Hashes don''t have an order.  The keys come out through iterators in a 
psuedo random order no matter what.  If you want to keep them in order, 
you have to use an array.  You can event make it an array of hashes if 
you like.

-- 
Posted via http://www.ruby-forum.com/.

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Matt Jones

2006-Nov-19 19:53 UTC

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Re: sorting a hash in a view

On 11/18/06, Craig White
<craigwhite-BQ75lA0ptkhBDgjK7y7TUQ@public.gmane.org>
wrote:>
>
> I should be able to figure this out but perhaps I am brain dead...
>
> I simply want to display the next id in sequence for a few
''categories''.
>
> My view template is very basic...
>
> <% for next_seq in @next_seq %>
>    <%= next_seq[0] %> - <%= next_seq[1] %><br />
> <% end %>
>
> and I want them sorted in next_seq[0] order and since @next_seq is a
> hash, it displays in a rather random order.
>
> Not that this should matter, but the controller code for this looks like
> this...
>
>     @lib_cat = Valuelist.find(:all,
>       :conditions => ["list_name = ''Library
Categories''"],
>       :order => ''list_value'')
>     @next_seq = Hash.new
>     for lib_cat in @lib_cat
>       @next_seq[lib_cat.list_value] = Library.find(:first,
>         :conditions => [''ltype = ?'',
lib_cat.list_value],
>         :order => ''id DESC'').id + 1
>     end
>
> I''m not doing a ''select'' so I can''t do
the normal collect_for_selection
> thingy


Rather than trying to force a hash to return a particular order, why not
just do what
options_for_select does - use an array of two-element arrays.
Your controller would look like this:

@lib_cat = Valuelist.find(:all,
      :conditions => ["list_name = ''Library
Categories''"],
      :order => ''list_value'')
@next_seq = Hash.new
for lib_cat in @lib_cat
    @next_seq << [lib_cat.list_value, Library.find(:first,
        :conditions => [''ltype = ?'', lib_cat.list_value],
        :order => ''id DESC'').id + 1]
end

(hardcore functional programmers can replace the for loop with an inject for
their
own amusement...)

The view code would remain the same.


-- 
Matt Jones
mdj.acme-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
President/Technical Director, Acme Art Company (acmeartco.org)


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Craig White

2006-Nov-19 21:35 UTC

head link

Re: sorting a hash in a view

On Sun, 2006-11-19 at 14:53 -0500, Matt Jones wrote:> 
> 
> On 11/18/06, Craig White
<craigwhite-BQ75lA0ptkhBDgjK7y7TUQ@public.gmane.org> wrote:
>         
>         I should be able to figure this out but perhaps I am brain
>         dead...
>         
>         I simply want to display the next id in sequence for a few
>         ''categories''.
>         
>         My view template is very basic...
>         
>         <% for next_seq in @next_seq %> 
>            <%= next_seq[0] %> - <%= next_seq[1] %><br />
>         <% end %>
>         
>         and I want them sorted in next_seq[0] order and since
>         @next_seq is a
>         hash, it displays in a rather random order.
>         
>         Not that this should matter, but the controller code for this
>         looks like 
>         this...
>         
>             @lib_cat = Valuelist.find(:all,
>               :conditions => ["list_name = ''Library
Categories''"],
>               :order => ''list_value'')
>             @next_seq = Hash.new
>             for lib_cat in @lib_cat 
>               @next_seq[lib_cat.list_value] = Library.find(:first,
>                 :conditions => [''ltype = ?'',
lib_cat.list_value],
>                 :order => ''id DESC'').id + 1
>             end
>         
>         I''m not doing a ''select'' so I
can''t do the normal
>         collect_for_selection 
>         thingy
> 
> 
> Rather than trying to force a hash to return a particular order, why
> not just do what 
> options_for_select does - use an array of two-element arrays.
> Your controller would look like this: 
> 
> @lib_cat = Valuelist.find(:all,
>       :conditions => ["list_name = ''Library
Categories''"],
>       :order => ''list_value'')
> @next_seq = Hash.new
> for lib_cat in @lib_cat
>     @next_seq << [lib_cat.list_value, Library.find(:first,
>         :conditions => [''ltype = ?'',
lib_cat.list_value],
>         :order => ''id DESC'').id + 1]
> end
> 
> 
> 
> (hardcore functional programmers can replace the for loop with an
> inject for their 
> own amusement...)
> 
> The view code would remain the same.----
yep - just had to replace

@next_seq = Hash.new
with
@next_seq = Array.new

Thanks

Craig


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Rails - Nov 2006 - sorting a hash in a view

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