title: Can not migrate database on Sinatra "no password supplied" for postgresql?
body: <p>I am working on Ruby project using Sinatra.
  So, I have already created the database.
  But when I tried to migrate it, I got below error:</p>
  
  <pre><code>rake aborted!
  PG::ConnectionBad: fe_sendauth: no password supplied
  </code></pre>
  
  <p>So anyone know how to fix this?
  Thanks!</p>