Hello everybody,

I'm having a "simple" problem but is taking me a long time to understand and
i'll try to do a short and a full explanation about the problem...

*<short explanation>*
I'm quite beginner at rails and i'm facing a weird problem to make a two
select boxes working dynamic. I have a table called conditions and this
table has condition_type and condition_value. I want to put in the first
select all the condition types and as an user select a type the condition
values for that type (this means all the rows that have
condition_type=selected) will be show in a second select.

So far i'm trying different approachs like railcast #88 or
http://pullmonkey.com/2008/3/30/dynamic-select-boxes-ruby-on-rails/ but i
dont know what is happening.

When i select the condition_type the on_change method is called and then the
controller is called and make the correct search on the database and i can
get the correct response at firebug but the second select is not rendered
with the new data.

*</short explanation>*
*<complete explanation>*

So far, my code is:

*rules_controller.rb
def new
      @rule = Rule.new
      @condition_type = Condition.find(:all, :select => 'DISTINCT
condition_type')
      @condition_value = Condition.find(:all, :select => 'DISTINCT
condition_value')
end

def update_condition_value
    @condition_value  = Condition.find(:all, :conditions => {
:condition_type => params[:condition_type]})
    render :action => "update_condition_value.js.rjs"
end

_form_new.html.erb
    <%  form_for @rule do |rule_form| %>
    Name: <%= rule_form.text_field :rule_name %>
    Condition type: <%= select_tag 'condition_type[]',

options_from_collection_for_select(@condition_type, 'condition_type',
'condition_type'),
                                             {:onchange =>
remote_function(:url  =>
                                             {:action =>
"update_condition_value"}, :with => "'condition_type='+value")} %>

    <div id="condition_value_div">Condition value: <%= render :partial =>
'condition_value'%></div>
    <%= rule_form.submit "Submit" %>
    <%end%>

_condition_value.html.erb
    <%= select_tag 'condition_value',
options_from_collection_for_select(@condition_value, 'condition_value',
'condition_value')%>

update_condition_value.js.rjs
     page.replace_html 'condition_value_div', :partial =>
'condition_value'e')*

The problem that i'm facing is that when i select some condition_type the
on_change is activated and then they call the update_condition_value.js.rjs
and i can see from the firebug that i receive an response like:

try {
Element.update("condition_value_div", "<select id=\"condition_value\"
name=\"condition_value\"><option
value=\"private\">private</option>\n<option
value=\"public\">public</option></select>\n\n");
} catch (e) { alert('RJS error:\n\n' + e.toString());
alert('Element.update(\"condition_value_div\", \"<select
id=\\\"condition_value\\\" name=\\\"condition_value\\\"><option
value=\\\"private\\\">private</option>\\n<option
value=\\\"public\\\">public</option></select>\\n\\n\");'); throw e }

as it should be... This means that they went to the controller and make the
correct call from the database as i can see at the log at netbeans. But the
problem is that the page is not rendered or any changes occoru with the
second select.

So, i can say that every step is working until the call from the controller
at update_condition_value but looks like i have an mismatch or error at
render :action => "update_condition_value.js.rjs" call.

I think maybe could be a problem with my routes cause when i see the log
after i select something at the first select i get this:

*  Processing RulesController#update_condition_value to json (for 127.0.0.1
at 2009-09-08 14:43:18) [POST]
  Parameters: {"format"=>"json", "condition_type"=>"group",
"action"=>"update_condition_value", "controller"=>"rules"}
  [4;36;1mCondition Load (0.0ms)[0m   [0;1mSELECT * FROM `conditions` WHERE
(`conditions`.`condition_type` = 'group')
  Rendering rules/update_condition_value
  [4;35;1mCondition Columns (0.4ms)[0m   [0mSHOW FIELDS FROM `conditions`[0m
  Rendered rules/_condition_value (1.8ms)
  Completed in 89ms (View: 2, DB: 5) | 200 OK [
http://localhost/rules/update_condition_value]*

and i understand that they are trying to render the content at
http://localhost/rules/update_condition_value but the address that i'm using
is http://localhost:3000/coreui/privacy/1/rules/new
as u can see at the routes file:
*
     map.resources :rules, :path_prefix => '/coreui/privacy/:user_id'*

I dont know what else i should do to make this work and any help or tips
will be welcome!

Thanks in advance...

</complete explanation>

-- 
Marcos Müller Lopes Fonseca
Arquiteto da Informação - MAV Tecnologia
Gerente de projetos - UFMG Informática Jr.
Sistemas de Informação - UFMG
[email protected] / 87553132

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