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

		return $this->arrModels[$this->intIndex]->delete();
	}
public function delete()
	{
		if ($this->intIndex < 0)
		{
			$this->first();
		}

		return $this->arrModels[$this->intIndex]->delete();
	}
Delete the current model and return the number of affected rows

@return integer The number of affected rows