/**
  * Update a record in the database.
  *
  * @param  array  $values
  * @return int
  */
 public function update(array $values)
 {
     $bindings = array_values(array_merge($values, $this->getBindings()));
     $sql = $this->grammar->compileUpdate($this, $values);
     return $this->connection->update($sql, $this->cleanBindings($bindings));
 }