Lithium MongoDB unique tags from users

gistfile1.txt

Get

array
  'assertion' => string 'reduce -> multiple not supported yet' (length=36)
  'assertionCode' => int 10075
  'errmsg' => string 'db assertion failure' (length=20)
  'ok' => float 0

From

  public static function uniqueTags($client_id) {
     $self = static::_object();
     $source = $self->_meta['source'];
     $map = "function() {
       if (!this.tags) {
         return;
       }
       this.tags.forEach(function(tag) {
         emit(tag,tag);
       })
     }";
 
     $reduce = "function (key, values) {
       return values;
     }";
 
     // Run the command
     $tags = $self::connection()->connection->command(array(
       'mapreduce' => $source,
       'map' => $map,
       'reduce' => $reduce,
       'out' => array('inline' => 1)
     ));
     var_dump($tags);
   }