Sharagoz -- wrote:
>> validates_size_of :value, :is=>9, :message=>"must be 5-digit number",
>> :if=>Proc.new{|u| u.value.is_a?(Numeric)}
> Looks corrent to me. Maybe the name of the field "value" is causing a 
> conflict somewhere. Try to rename the field to something else just to 
> test.
Thanks Sharagoz.  I tried different names for the field but none of 
those worked.
I just wrote a custom validation to workaround it although still can't 
figure it out.

Anyone has any idea about the second problem?

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