private function getAssociations() : array
    {
        $result = [];
        foreach ($this->getQueryFields() as $field) {
            $association = $this->getAssociationByField($field);
            if (null === $association) {
                continue;
            }

            if (array_key_exists($association->getName(), $result)) {
                continue;
            }

            $result[$association->getName()] = $association;
        }

        return $result;
    }