private function getForwardOnlyField()
    {
        $fFields = [];
        $fields = $this->fetchFields(['reverse' => false]);
        foreach ($fields as $field) {
            $fFields[$field->getName()] = $field;

            // Due to the way powerorm's internals work, getField() should also
            // be able to fetch a field by attname. In the case of a concrete
            // field with relation, includes the *_id name too
            $fFields[$field->getAttrName()] = $field;
        }

        return $fFields;
    }