validates :id, :uniqueness => true, :presence => { :on => :update },
:numericality => { :on => :update, :only_integer => true }
- validates :note, :presence => true, :associated => true
+ validates :note, :associated => true
validates :visible, :inclusion => [true, false]
validates :author, :associated => true
validates :event, :inclusion => %w[opened closed reopened commented hidden]