Rails - Apr 2006 - can i alter the _form.rhtml without have troubles to validat

hello my name is reynaldo

and i have a problem

i alter the _form.rhtml to display a select option in the place a simple 
text_box, and the application work very well, but in the moment that i 
apply a validation in the model  i get a error.

the code is the next


in the controller:

  def new
    @catelemento = Catelemento.new
    @komandancias = Catcomandancia.find(:all)
  end


in the _form.rhtml

<%= error_messages_for ''catelemento'' %>
<!--[form:catelemento]-->

<p><label
for="catelemento_Comandancia">Comandancia</label><br/>

<select id="catelemento_Comandancia"
name="catelemento[Comandancia]">
    <%for koman in @komandancias %>
            <option value="<%= koman.id %>"><%=
koman.Nombre %></option>
    <% end %>
</select>


<p><label
for="catelemento_Clave">Clave</label><br/>
<%= text_field ''catelemento'', ''Clave'' 
%></p>

<p><label
for="catelemento_Nombre">Nombre</label><br/>
<%= text_field ''catelemento'', ''Nombre'' 
%></p>



in the model
class Catelemento < ActiveRecord::Base
   validates_presence_of :Nombre
end


-------------------------------------------------
the case is the next:

if i remove the validation : the application works

if i remove the selecet option : the application works


but i need both characteristics


if any person can help me, i''ll thank you so much

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

On 4/29/06, Rey <zyon13@hotmail.com> wrote:
>
> hello my name is reynaldo
>
> and i have a problem
>
> i alter the _form.rhtml to display a select option in the place a simple
> text_box, and the application work very well, but in the moment that i
> apply a validation in the model  i get a error.


what is the error that you get?


the code is the next
>
>
> in the controller:
>
>   def new
>     @catelemento = Catelemento.new
>     @komandancias = Catcomandancia.find(:all)
>   end
>
>
> in the _form.rhtml
>
> <%= error_messages_for ''catelemento'' %>
> <!--[form:catelemento]-->
>
> <p><label
for="catelemento_Comandancia">Comandancia</label><br/>
>
> <select id="catelemento_Comandancia"
name="catelemento[Comandancia]">
>     <%for koman in @komandancias %>
>             <option value="<%= koman.id %>"><%=
koman.Nombre %></option>
>     <% end %>
> </select>

instead of the above, you could use:

<select id="catelemento_Comandancia"
name="catelemento[Comandancia]">
    <%= options_from_collection_for_select(@komandancias,
''id'',
''nombre'', {:prompt => "Please select a value"})
%>
</select>

<p><label
for="catelemento_Clave">Clave</label><br/>
> <%= text_field ''catelemento'',
''Clave''  %></p>
>
> <p><label
for="catelemento_Nombre">Nombre</label><br/>
> <%= text_field ''catelemento'',
''Nombre''  %></p>

just a suggestion: use lower case for all your attribute names.. ie instead
of ''Clave'', use ''clave''.  You should only
use leading capitals for class
names (make sure the rows in your database also use lowercase names)

Mike
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