comparaison de la date avec ActiveSupport :: TimeWithZone a échoué

J'ai un age méthode sur mon Waiver modèle qui ressemble à:

  def age(date = nil)

    if date.nil?
      date = Date.today
    end
    age = 0
    unless date_of_birth.nil?
      age = date.year - date_of_birth.year
      age -= 1 if date < date_of_birth + age.years #for days before birthday
    end
    return age
  end

Je puis avoir une spécification qui ressemble à:

it "calculates the proper age" do
 waiver = FactoryGirl.create(:waiver, date_of_birth: 12.years.ago)
 waiver.age.should == 12
end

Lorsque j'exécute ce spec-je obtenir comparison of Date with ActiveSupport::TimeWithZone failed. Ce que je fais mal?

Failures:

  1) Waiver calculates the proper age
     Failure/Error: waiver.age.should == 12
     ArgumentError:
       comparison of Date with ActiveSupport::TimeWithZone failed
     # ./app/models/waiver.rb:132:in `<'
     # ./app/models/waiver.rb:132:in `age'
     # ./spec/models/waiver_spec.rb:23:in `block (2 levels) in <top (required)>'

source d'informationauteur Kyle Decot