[Rails] Update model with array of IDs

Hi,
I am trying to use the update method of activerecord with an array of
ids as the first param.
It does not update any row. The APIs say that it should work.

The array contains 2 IDs.
RSCampaign.update([1,2], {:end_date =>
Date.strptime("120228","%y%m%d")})

If I put an ID instead of the array, it updates fine.

Please help.

I am using ruby 1.8.6

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