use new validation syntax in several models

app/models/day.rb

@@ -2,27 +2,16 @@ class Day < ActiveRecord::Base
   include HumanizedDateRange
 
   belongs_to :conference
-  # TODO a new day should search matching availabilities without a day:
-  #      in case someone deletes a day, availabilities need to persist,
-  #      so they can be reclaimed by a new day later
-  #      if a.day_id.nil?
-  #      on_create(day)
-  #      conference.availabilities.each { |a| 
-  #      next unless a.day_id = nil
-  #      a.day_id = @conference.days.map { |day| day.id 
-  #        if a.start_time.between?(day.start_date, day.end_date)
-  #           or a.end_time.between?(day.start_date, day.end_date)
-  #           or day.start_date.between?(a.start_time, a.end_time) }
   has_many :availabilities
 
   has_paper_trail meta: {associated_id: :conference_id, associated_type: "Conference"}
 
   default_scope { order(start_date: :asc) }
 
-  validates_presence_of :start_date, message: "missing start date"
-  validates_presence_of :end_date, message: "missing end date"
-  validate :start_date_before_end_date, message: "failed validation"
-  validate :does_not_overlap, message: "overlaps, failed validation"
+  validates :start_date, presence: true
+  validates :end_date, presence: true
+  validate :start_date_before_end_date
+  validate :does_not_overlap
 
   def start_date_before_end_date
     self.errors.add(:end_date, "should be after start date") if self.start_date >= self.end_date

app/models/event_feedback.rb

@@ -4,7 +4,7 @@ class EventFeedback < ActiveRecord::Base
 
   after_save :update_average
 
-  validates_presence_of :rating, message: "please select a value"
+  validates_presence_of :rating
 
   protected
 

app/models/event_rating.rb

@@ -5,7 +5,7 @@ class EventRating < ActiveRecord::Base
 
   after_save :update_average
 
-  validates_presence_of :rating, message: "rating score was missing"
+  validates_presence_of :rating
 
   validates :event, presence: true
   validates :person, presence: true

app/models/notification.rb

@@ -6,7 +6,7 @@ class Notification < ActiveRecord::Base
   validates :reject_body,    presence: true
   validates :accept_body,    presence: true
   validates :accept_subject, presence: true
-  validate :uniq_locale, message: "this locale already exists for this call for papers"
+  validate :uniq_locale
   # TODO
   #validate :locale_is_valid