Hi, this would work because for the simply fact that :minimum isn't a configuration option for validates_numericality_of. At this time, the config options are as follows:
Configuration options:
message - A custom error message (default is: "is not a number")
on - Specifies when this validation is active (default is :save, other options :create, :update)
only_integer - Specifies whether the value has to be an integer, e.g. an integral value (default is false)
allow_nil - Skip validation if attribute is nil (default is false). Notice that for fixnum and float columsn empty strings are converted to nil
Good luck,
-Conrad