days is a method on the Numeric class in Rails, and it creates an instance of ActiveSupport::Duration with self passed to the constructor (this is a bit of a simplification, because it actually calls the class method days on Duration which converts the number of days into seconds before creating the Duration instance).
daysis a method on theNumericclass in Rails, and it creates an instance ofActiveSupport::Durationwithselfpassed to the constructor (this is a bit of a simplification, because it actually calls the class methoddaysonDurationwhich converts the number of days into seconds before creating theDurationinstance).