title: Delta Indexing not working with Thinking Sphinx
body: <p>Core-Index works, but Delta-Index just does not work. But the strange thing is, that there are no errors or warnings in the log-files, so I don't know how to debug it.
  I tested it with phusion-passenger and locally with Webbrick. The results are the same.
  I use rails 3.2.13 and thinking-sphinx 3.1.0.</p>
  
  <p>My index-definition:</p>
  
  <pre><code>ThinkingSphinx::Index.define :log, :with =&gt; :active_record, :delta =&gt; true do
    indexes msg, :sortable =&gt; true
    has moment, :type =&gt; :timestamp
    has program, :type =&gt; :string
  end
  </code></pre>
  
  <p>I also tried using delayed-delta with the same results.</p>
  
  <p>Any ideas?</p>
  
  <p>Thanks!</p>
  
  <p><strong>Edit:</strong>
  Is it because I write the data directly via MySQL into the database?
  So new records are only recognized, if rails+active_record are used?</p>