title: Thinking Sphinx "no field found in schema" error
body: <p>I am pretty new to Sphinx.</p>
  
  <p>Trying to find user with name "bob" and company_id "14".</p>
  
  <pre><code>Controller:
  @users = User.search 'bob', :conditions =&gt; { :company_id =&gt; '14'}
  
  Model:
    define_index do
      indexes :name
      indexes :company_id
    end
  
  Error:
  index user_core: query error: no field 'company_id' found in schema
  </code></pre>
  
  <p>I have the 'company_id' in table &amp; I re-indexed everything several times.
  When I am just searching for the 'name' everything works properly.</p>