public function offsetSet($offset, $data) {
		$this->offsetGet($offset);
		return $this->_set($data, $offset);
	}
public function offsetSet($offset, $data) {
		$this->offsetGet($offset);
		return $this->_set($data, $offset);
	}
public function offsetSet ( $ offset , $ data ) { $ this -> offsetGet ( $ offset ) ; return $ this -> _set ( $ data , $ offset ) ; }
Adds the specified object to the `Collection` instance, and assigns associated metadata to
the added object.

@param string $offset The offset to assign the value to.
@param mixed $data The entity object to add.
@return mixed Returns the set `Entity` object.
Adds the specified object to the Collection instance and assigns associated metadata to the added object .