title: Error with pg_search multisearch after initializing tsearch, trigram
body: <p>I had pg_search working on my Rails 3.2.3 app using multisearch.  Then I implemented the initializer provided by nertzy (author of pg_search) in <a href="https://stackoverflow.com/questions/10512642/how-to-enable-tsearch-dictionary-for-pg-search-multi-search"> this post.</a>.  Now when I run a search I get the following error:</p>
  
  <pre><code>PG::Error: ERROR:  operator does not exist: text % unknown
  LINE 1: ... ((coalesce("pg_search_documents"."content", '')) % 'searchterm...
                                                               ^
  HINT:  No operator matches the given name and argument type(s). You might need to add explicit type casts.
  </code></pre>
  
  <p>My view is rendered with this code:</p>
  
  <pre><code>&lt;%= @pg_search_documents.each do |pg_search_document| %&gt;
    &lt;%= pg_search_document.searchable.title %&gt;
  &lt;% end %&gt;
  </code></pre>
  
  <p>The rest of my setup can be found <a href="https://stackoverflow.com/questions/10577178/basic-setup-for-multisearch-in-pg-search-and-rails-3-2-3">here.</a>  Any help is much appreciated.</p>