ive found that this pattern is called multi stage download. Its used by 
kayak.com which is famous for its user interface. That site makes 
finding cheap flights actually enjoyable.

Here are some general background links i found

this discusses the pattern in general

http://ajaxpatterns.org/Multi-Stage_Download#Code_Example

and this is a review of the user interface for kayak

http://konigi.com/podcast/kayak-com

But i still dont know where to start looking for a rails implementation 
how to.

Where should i start looking (ive googled for ages, cant find anything 
appropriate)

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