Pheasant\Relationships\HasOne::get PHP Method

    public function get($object, $key, $cache = null)
    {
        if ($cache) {
            $schema = \Pheasant::instance()->schema($this->class);
            if ($cached = $cache->get($schema->hash($object, array(array($this->local, $this->foreign))))) {
                return $cached;
            }
        }
        if (($localValue = $object->{$this->local}) === null) {
            if ($this->_allowEmpty) {
                return null;
            } else {
                throw new \Pheasant\Exception("Local value is null while not allowed");
            }
        }
        $result = $this->query("{$this->foreign}=?", $localValue)->execute();
        if (!count($result)) {
            if ($this->_allowEmpty) {
                return null;
            } else {
                throw new \Pheasant\Exception("Failed to find a {$key} (via {$this->foreign}={$localValue})");
            }
        }
        return $this->hydrate($result->row());
    }