Scalr\Model\AbstractEntity::_findPk PHP Метод

    private function _findPk(array $args = [])
    {
        $iterator = $this->getIterator();
        $pk = $iterator->getPrimaryKey();
        if (empty($pk)) {
            throw new ModelException(sprintf("Primary key has not been defined with @Id tag for %s", get_class($this)));
        }
        if (count($args) != count($pk)) {
            throw new InvalidArgumentException(sprintf("The number of arguments passed does not match the primary key fields (%s)", join(', ', $pk)));
        }
        $pkValues = array_combine($pk, $args);
        $stmtFields = '';
        $stmtWhere = '';
        $arguments = array();
        foreach ($iterator->fields() as $field) {
            $stmtFields .= ',' . $field->getColumnName();
            if (isset($field->id)) {
                if (!isset($pkValues[$field->name]) && $field->column->nullable) {
                    $stmtWhere .= 'AND ' . $field->getColumnName() . ' IS NULL ';
                } else {
                    $stmtWhere .= 'AND ' . $field->getColumnName() . ' = ' . $field->type->wh() . ' ';
                    $arguments[] = $field->type->toDb($pkValues[$field->name]);
                }
            }
        }
        $stmtFields = substr($stmtFields, 1);
        $stmtWhere = substr($stmtWhere, 4);
        $item = $this->db()->GetRow("\n            SELECT {$stmtFields} FROM {$this->table()}\n            WHERE {$stmtWhere} LIMIT 1\n        ", $arguments);
        if ($item) {
            $this->load($item);
            return $this;
        }
        return null;
    }