title: loopback destroyAll for couch db not working with query
body: <p>I am trying out <code>loopback-connector-couch</code> database operator for deleting multiple records from <strong>CouchDB</strong> in one shot.
  I have records <code>_id</code> in an array</p>
  
  <p>Following the API spec for Loopback model as provided in the below api doc</p>
  
  <p><a href="https://apidocs.strongloop.com/loopback/#persistedmodel-destroyall" rel="nofollow">https://apidocs.strongloop.com/loopback/#persistedmodel-destroyall</a></p>
  
  <pre><code>persist_model.destroyAll({id:{or:["49c199312b7dce75d69124f9e377a682","49c199312b7dce75d69124f9e377a682"]}},function(err,res){
       console.log('records deleted success:'+res);
    });
  </code></pre>
  
  <p>When executing the above code, it does not throw any error but its not deleting any documents</p>
  
  <p>Would appreciate any help on this :)</p>