[Rails] How to: Set a datetime params-value to nil in the controller

Hi there,

Suppose I submit an object called "task" from a form with...

task[enddate(1i)] -> 2011
task[enddate(2i)] -> 3
task[enddate(3i)] -> 1

...how do I set the value 'params[:task][:enddate]' to 'nil' in the
controller?

I tried...

params[:task][:enddate] = nil

...but that doesn't seem to "empty" the attribute 'enddate'. What am I
getting wrong?

Thanks for your help!
Tom
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