Rails - Oct 2006 - nil object in live search

Hi,I am trying to implement a small live search thing in typo. the view 
that I interative with is view/admin/content/_form.rhtml  I created a 
search field when creating an article and use observe_field to observe 
this search field and tells the content_controller to search in database 
for the appropriate match.

But when I tried to type a letter in the search field, I''ve got the 
following error.

 NoMethodError in Admin/content#search

Showing app/views/admin/content/search.rhtml where line #1 raised:

You have a nil object when you didn''t expect it!
You might have expected an instance of Array.
The error occured while evaluating nil.length

Extracted source (around line #1):

1: <% if @results.length > 0 && @q != ''''-%>
2:   <table border=1 cellpadding=3px cellspacing=0px>
3:     <tr>
4:       <td align=center>

RAILS_ROOT: ./script/../config/..
Application Trace | Framework Trace | Full Trace

#{RAILS_ROOT}/app/views/admin/content/search.rhtml:1:in 
`_run_rhtml_admin_content_search''

anybody has some ideas? Thanks in advance!



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The source code shows as follows

app/views/admin/content/_form.rhtml

<%= text_field_tag(:search) %><br>

	<div id=search_indicator_div
		style="postition: absolute; left: your_X px; top: your_Y px">
  		<%= image_tag("/images/spinner.gif", :id =>
''indicator_gif_id'',
    	:style => ''display:none'') %>
	</div>

	<%= observe_field(:search,
		:frequency => 0.5,
		:update => :results,
		:url => { :action => :search },
		:loading => "Element.show(''indicator_gif_id'')",
		:complete =>
"Element.hide(''indicator_gif_id'')") %>

<span id="results"></span>

app/controllers/admin/content_controller.rb

def search
    @q = request.raw_post
    # optionally handle the query however you''d like
    # fetch some results from a database
    @results = Tlc.find(:all, :conditions => [ "loc LIKE ?",
"%" + @q
+"%"])
end

whereas Tlc is a table that I created and loc is one column in this 
table.

app/views/admin/content/search.rhtml

<% if @results.length > 0 && @q != ''''-%>
  <table border=1 cellpadding=3px cellspacing=0px>
    <tr>
      <td align=center>
        <b>Location</b>
      </td>
      <td align=center>
        <b>State</b>
      </td>
    </tr>

    <% for result in @results %>
    <tr>
      <td align=center>
        <%= result.loc -%><br>
      </td>
      <td>
        <%= result.st -%>
      </td>
    </tr>
  </table>
<% end %>

<% else -%>
  <% if @q != '''' -%>
    Sorry, there are no results for:
    <br> <b><%=h @q -%>
  <% end -%>
<% end -%>

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