core-bundle/src/Resources/contao/library/Contao/Model.php
public function mergeRow(array $arrData)
	{
		foreach ($arrData as $k=>$v)
		{
			if (strpos($k, '__') !== false)
			{
				continue;
			}

			if (!isset($this->arrModified[$k]))
			{
				$this->arrData[$k] = $v;
			}
		}

		return $this;
	}
public function mergeRow(array $arrData)
	{
		foreach ($arrData as $k=>$v)
		{
			if (strpos($k, '__') !== false)
			{
				continue;
			}

			if (!isset($this->arrModified[$k]))
			{
				$this->arrData[$k] = $v;
			}
		}

		return $this;
	}
Set the current record from an array preserving modified but unsaved fields

@param array $arrData The data record

@return static The model object