Ruby on rails - setear mensaje diferente para errores

class BetterNumericalityValidator < ActiveModel::EachValidator
def validate_each(record,attribute,value)
if value < 0
record.errors[attribute] << "must be greater than or equal to 0"
elsif value >= 1000000
record.errors[attribute] << "must be less than 1000000")
end end end

def validate
if self.price < 0
errors.add(:price, "custom message")
elsif
self.price > 1000000
errors.add(:price, "custom message")
end
end