Let's say you need to add a validation for the birthdate column so that the User's age is between 1 and 3 (must be a toddler).
In your User model:
validate :toddler_age
def toddler_age
birthdate_within_range = ((4.years.ago - 1.day)..1.year.ago).cover?(birthdate)
errors.add(:birthdate, 'must be 1-3 years old') unless birthdate_within_range
end
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