Rails - Jan 2006 - Using AWS to pass in an object and associations

I, I have an object and associations, say order and line_items.
I want to submit this order and its lineitems to a central server using 
AWS.

One way is to have an AWS method to submit the order object, and another 
method to submit each line_item individually (as I can''t have a typed 
array as an :expects parameters) - so I can''t submit all my line_items 
in one go. This is expensive, though - I want to keep my AWS calls to a 
bare minimum.

Is there a better way? Say building up a YAML or XML string and shoving 
all that into an :expects parameter? Or am I missing some other obvious 
solution?

Thanks
Joerg

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