> On a separate issue, looking at the message you get, are you using
> ruby 1.9.1?  If so then upgrade to 1.9.2 or go back to 1.8.7, ruby
> 1.9.1 does not work reliably with rails.  This may have nothing to do
> with your problem.
>

I'm using ruby 1.9.2

> I note that you still have not answered my question (unless I missed
> it), have you any validations on the Storage model?
>
 I have validations for presence (product_id, current_quantity and
stg_data)
and for numericality (current_quantity)

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