Merge pull request #281 from tomatoes-app/update-date-time-types

Update date time types

app/models/concerns/expiring.rb

@@ -1,7 +1,9 @@
 module Expiring
   extend ActiveSupport::Concern
+
   included do
     field :eat, as: :expires_at, type: Time
+
     index({ eat: 1 }, expire_after_seconds: 0, name: 'expiration_index')
   end
 end

app/models/concerns/score.rb

@@ -1,10 +1,21 @@
 module Score
   extend ActiveSupport::Concern
+
   included do
+    include Mongoid::Timestamps
+
     belongs_to :user, foreign_key: :uid
+
     field :s, as: :score, type: Integer
-    field :cat, as: :created_at, type: DateTime
-    field :uat, as: :updated_at, type: DateTime
+
+    # Note: `Mongoid::Timestamps` module defines `created_at`, `updated_at`,
+    # and callbacks to keep these fields up to date. `::fields` is a hash table
+    # that contains document's fields. This is a similar approach used by
+    # `Mongoid::Timestamps::Short` to define short names for timestamp fields.
+    fields.delete('created_at')
+    field :cat, as: :created_at, type: Time
+    fields.delete('updated_at')
+    field :uat, as: :updated_at, type: Time
 
     index({ uid: 1 }, unique: true, name: 'uid_index')
     index({ s: -1 }, name: 'score_index')