Update paper_trail, show ticket price with currency in versions

Gemfile.lock

@@ -323,9 +323,8 @@ GEM
       rack-openid (~> 1.3.1)
     open4 (1.3.4)
     orm_adapter (0.5.0)
-    paper_trail (5.2.1)
-      activerecord (>= 3.0, < 6.0)
-      activesupport (>= 3.0, < 6.0)
+    paper_trail (9.0.0)
+      activerecord (>= 4.2, < 5.3)
       request_store (~> 1.1)
     parallel (1.12.0)
     parser (2.4.0.2)
@@ -433,7 +432,8 @@ GEM
       json
     redcarpet (3.2.3)
     referer-parser (0.3.0)
-    request_store (1.1.0)
+    request_store (1.4.1)
+      rack (>= 1.4)
     responders (2.4.0)
       actionpack (>= 4.2.0, < 5.3)
       railties (>= 4.2.0, < 5.3)

app/models/event.rb

@@ -305,7 +305,7 @@ class Event < ApplicationRecord
 
   def set_week
     self.week = created_at.strftime('%W')
-    without_versioning do
+    paper_trail.without_versioning do
       save!
     end
   end

app/models/registration.rb

@@ -77,7 +77,7 @@ class Registration < ApplicationRecord
 
   def set_week
     self.week = created_at.strftime('%W')
-    without_versioning do
+    paper_trail.without_versioning do
       save!
     end
   end

app/views/admin/versions/_object_desc_and_link.html.haml

@@ -1,8 +1,10 @@
-- object = current_or_last_object_state(version.item_type, version.item_id)
+:ruby
+  object = current_or_last_object_state(version.item_type, version.item_id)
 
-- unless version.item_type == 'Role' || version.item_type == 'UsersRole'
-  - conference = Conference.find_by(id: version.conference_id)
-  - conference_short_title = conference.try(:short_title) || current_or_last_object_state('Conference', version.conference_id).try(:short_title) || ' '
+  unless version.item_type == 'Role' || version.item_type == 'UsersRole'
+    conference = Conference.find_by(id: version.conference_id)
+    conference_short_title = conference.try(:short_title) || current_or_last_object_state('Conference', version.conference_id).try(:short_title) || ' '
+  end
 
 - case version.item_type
 - when 'Organization'

app/views/shared/_object_changes.html.haml

@@ -10,10 +10,13 @@
     %thead
       %tr
         %th Updated Attribute
-        - if version.event != 'create'
-          %th Previous Value
-        - if version.event != 'destroy'
-          %th New Value
+
+        %th{ class: "#{'hidden' if version.event == 'create'}" }
+          Prevous Value
+
+        %th{ class: "#{'hidden' if version.event == 'destroy'}" }
+          New Value
+
         - if can? :revert_attribute, version
           %th Action
     %tbody
@@ -21,26 +24,35 @@
         - version.changeset.reject{ |_, values| values[0].blank? && values[1].blank? }.each do |attribute, values|
           %tr
             %td= attribute
-
+            - if version.event != 'create'
+              %td
                 / If the attribute is an associated model, show the value of the record it corresponds to, not just the ID.
                 / Eg. when the version is of an Event, if the attribute is event_type_id it shows
                 / Workshop (ID: 116) instead of just 116
                 - if attribute.include?('_id')
                   - model_name = attribute.chomp('_id').camelize
-              - if version.event != 'create'
-                %td
                   - associated_object = current_or_last_object_state(model_name, values[0])
+
                   = associated_object.try(:title) || associated_object.try(:name)
                   = values[0].blank? ? '-' : "(ID: #{values[0]})"
+                - else
+                  = values[0].blank? ?  '-' : values[0]
+
+                  - if attribute == 'price_cents'
+                    = "(#{humanized_money_with_symbol previous_version.try(:price)})"
             %td
+              - if attribute.include?('_id')
+                - model_name = attribute.chomp('_id').camelize
                 - associated_object = current_or_last_object_state(model_name, values[1])
+
                 = associated_object.try(:title) || associated_object.try(:name)
                 = (values[1].blank? ? '-' : "(ID: #{values[1]})")
 
               - else
-              - if version.event != 'create'
-                %td= values[0].blank? ?  '-' : values[0]
-              %td= values[1].blank? ?  '-' : values[1]
+                = values[1].blank? ?  '-' : values[1]
+
+                - if attribute == 'price_cents'
+                  = "(#{humanized_money_with_symbol version_item.try(:price)})"
 
             - if can? :revert_attribute, version
               %td= link_to 'Revert', admin_revision_history_revert_attribute_path(id: version.id, attribute: attribute), class: 'btn btn-sm btn-primary', data: { confirm: "Are you sure you want to revert #{attribute}?" }
@@ -49,11 +61,14 @@
           %tr
             %td= attribute
 
+            %td
               - if attribute.include?('_id')
                 - model_name = attribute.chomp('_id').camelize
-              %td
                 - associated_object = current_or_last_object_state(model_name, value)
                 = associated_object.try(:title) || associated_object.try(:name)
                 = value.blank? ? '-' : "(ID: #{value})"
               - else
-              %td= value.blank? ?  '-' : value
+                = value.blank? ?  '-' : value
+
+                - if attribute == 'price_cents'
+                  = "(#{humanized_money_with_symbol version_item.try(:price)})"