Hello, I'm trying to process and visualize my data in an exportable report. This is the my data processing (in the setup() function):

 $dsSetting = array(
	        'filePath' => dirname(__FILE__)."/csv/".$this->params["csv"],
	        'fieldSeparator' => ','
	    );
	    
	    
	    $src = new \koolreport\datasources\CSVDataSource($dsSetting, $this);
	    
	    $src->pipe(new Custom(function($row) {
	        $row["ts_from"] = str_replace(" UTC+00:00","", $row["ts_from"]);
	        return $row;
	    }))
	    ->pipe(new DateTimeFormat(array(
	        "ts_from" => array(
	            "from" => "d-m-Y H:i:s",
	            "to" => "d-M"
	        )
	    )))
	    ->pipe(new Filter(array(
	       array("sensor", "=", "geiger"),
	       array("avg", "!=", null),
	       array("min", "!=", null),
	       array("max", "!=", null)
	    )))
	    ->pipe(new Custom(function($row) {
	        $row["ts_from"] = array("v" => (int)$this->geiger_idx, "f" => $row["ts_from"]);
	        $this->geiger_idx ++ ;
	        return $row;
	    }))
	    ->pipe(new OnlyColumn(
	        array("ts_from", "avg", "min", "max", "qi")
	        ))
	    ->pipe(new AggregatedColumn(array(
	        "min_measure" => array("min", "min"),
	        "max_measure" => array("max", "max"),
	        "avg_measure" => array("avg", "avg"),
	        "qi" =>  array("avg", "qi")
	    )))
	    ->pipe($this->dataStore("csv_data_geiger"));

(printing rows in my Custom function works, so I'm sure data is correctly extracted from the csv file).

However, when I try to print my dataStore as follows (in my view file):

echo $this->dataStore('csv_data_geiger')->toJson();

it gives me the following result:

{"meta":{"columns":[]},"data":[]}

It turns out my dataStore is empty. What is the reason of that? Thank you!

Thank you so much, the second solution worked perfectly :)