code: public static function findPublishedBySourceAndParent($strSource, $intParent, $blnDesc=false, $intLimit=0, $intOffset=0, array $arrOptions=array())
  	{
  		$t = static::$strTable;
  		$arrColumns = array("$t.source=? AND $t.parent=?");
  
  		if (!static::isPreviewMode($arrOptions))
  		{
  			$arrColumns[] = "$t.published='1'";
  		}
  
  		$arrOptions['limit']  = $intLimit;
  		$arrOptions['offset'] = $intOffset;
  
  		if (!isset($arrOptions['order']))
  		{
  			$arrOptions['order']  = ($blnDesc ? "$t.date DESC" : "$t.date");
  		}
  
  		return static::findBy($arrColumns, array($strSource, (int) $intParent), $arrOptions);
  	}
docs: Find published comments by their source table and parent ID
  
  @param string  $strSource  The source element
  @param integer $intParent  The parent ID
  @param boolean $blnDesc    If true, comments will be sorted descending
  @param integer $intLimit   An optional limit
  @param integer $intOffset  An optional offset
  @param array   $arrOptions An optional options array
  
  @return Collection|CommentsModel[]|CommentsModel|null A collection of models or null if there are no comments