Rails - Aug 2008 - Combo Select Filter Data

Hi, this is my second post ( sorry for my language )

need yours helps with my problem.
i need filter my model by an option in a Combo select

i thing, "i should be" with observe_field and render partial, but i
have
a problem, when past to the second page, the application give me an
error. about ID

thx for your helps!
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David,

Could you post the code that you are using as well as the error message 
that it''s returning?

David navarrete David wrote:
> Hi, this is my second post ( sorry for my language )
> 
> need yours helps with my problem.
> i need filter my model by an option in a Combo select
> 
> i thing, "i should be" with observe_field and render partial, but
i have
> a problem, when past to the second page, the application give me an
> error. about ID
> 
> thx for your helps!
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*** controller **
def filtro
    if !params[:filtro][:campo].nil?
      tipo_filtro = params[:filtro][:campo]
        @inmobiliaria = Inmobiliaria.find(params[:id])
      proyecto = @inmobiliaria.proyectos_inmobiliarios.find(:all, 
:conditions => [''tipo_propiedad_id = ?'',tipo_filtro])
    end
    @proyectos = proyecto.paginate :page => params[:page], :per_page => 
10
    @numero_proyectos = proyecto.size
        render :partial => "resultado_inmobiliaria", :layout =>
false,
:object => @proyectos
  end
****
*** show **
<% form_for ''filtro'', :url => {:action => :filtro,
:id => params[:id]}
do |f| %>
    <%= f.select :campo,
        @tipos_propiedades.collect {|p| [ p.descripcion, p.id ] },{ 
:prompt => ''Seleccione Filtro''}, {:onchange =>
"submit();"} %>
<%= f.submit "asd"%>

<% end %>


<div id="inmobiliaria">
  <%= render :action => "resultado_inmobiliaria" %>
</div>
** show **

thx
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ups the error

You have a nil object when you didn''t expect it!
You might have expected an instance of ActiveRecord::Base.
The error occurred while evaluating nil.[]
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try:

if params[:filtro] && !params[:filtro][:campo].nil?
 ...

or

if (params[:filtro][:campo] rescue false)

if there''s no params[:filtro], the chained call to [:campo] will cause
that error.


On Aug 27, 5:48 pm, David navarrete David <rails-mailing-l...@andreas-
s.net> wrote:
> ups the error
>
> You have a nil object when you didn''t expect it!
> You might have expected an instance of ActiveRecord::Base.
> The error occurred while evaluating nil.[]
> --
> Posted viahttp://www.ruby-forum.com/.
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