yii\sphinx\ActiveFixture::getIndexSchema PHP Method

    public function getIndexSchema()
    {
        if ($this->_index !== null) {
            return $this->_index;
        }
        $db = $this->db;
        $indexName = $this->indexName;
        if ($indexName === null) {
            /* @var $modelClass ActiveRecord */
            $modelClass = $this->modelClass;
            $indexName = $modelClass::indexName();
        }
        $this->_index = $db->getSchema()->getIndexSchema($indexName);
        if ($this->_index === null) {
            throw new InvalidConfigException("Index does not exist: {$indexName}");
        }
        if (!$this->_index->isRuntime) {
            throw new InvalidConfigException("'{$indexName}' is not a runtime index. Only runtime indexes are supported.'");
        }
        return $this->_index;
    }