core-bundle/src/Resources/contao/library/Contao/Model/Collection.php
public function setRow(array $arrData)
	{
		if ($this->intIndex < 0)
		{
			$this->first();
		}

		$this->arrModels[$this->intIndex]->setRow($arrData);

		return $this;
	}
public function setRow(array $arrData)
	{
		if ($this->intIndex < 0)
		{
			$this->first();
		}

		$this->arrModels[$this->intIndex]->setRow($arrData);

		return $this;
	}
Set the current row from an array

@param array $arrData The row data as array

@return static The model collection object