rails built in datetime validation

Question

Does rails do any validation for datetime? I found a plugin http://github.com/adzap/validates_timeliness/tree/master, but it seems like something that should come in out

Answer 1

Recent versions of Rails will type cast values before validation, so invalid values will be passed as nils to custom validators. I'm doing something like this:

# app/validators/date_time_validator.rb
class DateTimeValidator < ActiveModel::EachValidator
  def validate_each(record, attribute, value)
    if record.public_send("#{attribute}_before_type_cast").present? && value.blank?
      record.errors.add(attribute, :invalid)
    end
  end
end

# app/models/something.rb
class Something < ActiveRecord::Base
  validates :sold_at, date_time: true
end

# spec/models/something_spec.rb (using factory_girl and RSpec)
describe Something do
  subject { build(:something) }

  it 'should validate that :sold_at is datetimey' do
    is_expected.not_to allow_value(0, '0', 'lorem').for(:sold_at).with_message(:invalid)
    is_expected.to allow_value(Time.current.iso8601).for(:sold_at)
  end
end