- validates_presence_of :id, :on => :update # is it necessary?
- validates_uniqueness_of :id
- validates_presence_of :changeset
- validates_associated :changeset
- validates_presence_of :author
- validates_associated :author
- validates :visible, :inclusion => { :in => [true, false] }
+ validates :id, :uniqueness => true, :presence => { :on => :update },
+ :numericality => { :on => :update, :integer_only => true }
+ validates :changeset, :presence => true, :associated => true
+ validates :author, :presence => true, :associated => true
+ validates :visible, :inclusion => [true, false]