title: RSpec, Spork & Postgres Error: prepared statement “a1” already exists
body: <p>In our PostgreSQL-backed Rails project, when running rspec using spork, sometimes we receive the following error:</p>
  
  <pre><code>ActiveRecord::StatementInvalid:
     PG::Error: ERROR:  prepared statement "a1" already exists
  </code></pre>
  
  <p>Originally, it occurred only a few times a day, but recently, it has begun happening every 3-4 test runs which slows our development efforts to a crawl.</p>
  
  <p>Is there a way to reset/delete the prepared statements in PostgreSQL somewhere inside of our <code>spec_helper.rb</code> file?</p>