diff --git a/app/assets/javascripts/moderations.js.coffee b/app/assets/javascripts/moderations.js.coffee
index 72fb8b00..773aa17c 100644
--- a/app/assets/javascripts/moderations.js.coffee
+++ b/app/assets/javascripts/moderations.js.coffee
@@ -1,5 +1,5 @@
 $(document).ready ->
   $('body.moderations .field.closer input[type=radio]').click ->
-    $('body.moderations #reason_text').parent().slideUp()
+    $('body.moderations #event_reason_text').parent().slideUp()
   $('body.moderations .field.opener input[type=radio]').click ->
-    $('body.moderations #reason_text').parent().slideDown()
+    $('body.moderations #event_reason_text').parent().slideDown()
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 1e91eca4..b4d95d9c 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -1,5 +1,6 @@
 # The top level controller, where can be centralised almost everything
 class ApplicationController < ActionController::Base
+  before_action :set_paper_trail_whodunnit
   before_action :set_locale
   # Prevent CSRF attacks by raising an exception.
   # For APIs, you may want to use :null_session instead.
diff --git a/app/controllers/moderations_controller.rb b/app/controllers/moderations_controller.rb
index 6d340967..c2b2a26c 100644
--- a/app/controllers/moderations_controller.rb
+++ b/app/controllers/moderations_controller.rb
@@ -44,7 +44,8 @@ class ModerationsController < ApplicationController
   # DELETE /events/1
   # DELETE /events/1.json
   def destroy
-    @moderation.reason_for_deletion = get_reason_from_params params[:reason]
+    @moderation.reason = params[:event][:reason] ||
+                         t("moderations.refuse.reason_#{params[:reason]}_long")
     @moderation.destroy!
     respond_to do |format|
       format.html { redirect_to :moderations, notice: t('.ok') }
@@ -77,12 +78,4 @@ class ModerationsController < ApplicationController
   def locked
     redirect_to edit_moderation_url(@moderation), alert: t('staleObjectError')
   end
-
-  def get_reason_from_params(reason)
-    if reason == 'r_4'
-      reason
-    else
-      t "moderations.refuse.reason_#{reason}_long"
-    end
-  end
 end
diff --git a/app/models/event.rb b/app/models/event.rb
index e7e4670e..62548799 100644
--- a/app/models/event.rb
+++ b/app/models/event.rb
@@ -1,5 +1,3 @@
-# encoding: utf-8
-
 # This is the central ADL class, where are managed all events
 class Event < ActiveRecord::Base
   extend SimpleCalendar
@@ -25,7 +23,7 @@ class Event < ActiveRecord::Base
   after_validation :geocode
 
   # Mechanism to store some reason which can be used when sending notifications
-  attr_accessor :reason_for_deletion
+  attr_accessor :reason
 
   after_create EventCallbacks
   after_update EventCallbacks
@@ -71,10 +69,8 @@ class Event < ActiveRecord::Base
   end
 
   before_validation on: :update do
-    if address_changed?
-      self.latitude = nil
-      self.longitude = nil
-    end
+    self.latitude = nil if address_changed?
+    self.longitude = nil if address_changed?
   end
 
   before_create do
@@ -113,7 +109,8 @@ class Event < ActiveRecord::Base
   def to_tweet
     url = Rails.application.routes.url_helpers.event_url(
       self,
-      host: ActionMailer::Base.default_url_options[:host])
+      host: ActionMailer::Base.default_url_options[:host]
+    )
 
     tweet = "#{self} #{url}"
     if tweet.size >= 140
@@ -125,8 +122,7 @@ class Event < ActiveRecord::Base
   private
 
   def end_after_start
-    return if end_time.blank? || start_time.blank?
-
-    errors.add :end_time, :before_start if end_time <= start_time
+    errors.add :end_time, :before_start if
+      !end_time.blank? && !start_time.blank? && end_time <= start_time
   end
 end
diff --git a/app/models/orga.rb b/app/models/orga.rb
index 6d587a61..d9e6efb2 100644
--- a/app/models/orga.rb
+++ b/app/models/orga.rb
@@ -28,7 +28,7 @@ class Orga < ActiveRecord::Base
   scope :locality, -> {}
   scope :daylimit, -> {}
   scope :future, -> {}
-  scope :period, ->(year, week) {}
+  scope :period, ->(_year, _week) {}
 
   scope :region, ->(region) { where region: region unless region == 'all' }
   scope :tag, ->(tag) { where 'tags like ?', "%#{tag}%" }
diff --git a/app/views/event_mailer/destroy.text.haml b/app/views/event_mailer/destroy.text.haml
index a4c33362..19a578c8 100644
--- a/app/views/event_mailer/destroy.text.haml
+++ b/app/views/event_mailer/destroy.text.haml
@@ -1,6 +1,6 @@
 = t '.body', author: @current_user
 \
-= @event.reason_for_deletion
+= @event.reason
 \
 = t '.reclamation'
 \
diff --git a/app/views/moderation_mailer/destroy.text.haml b/app/views/moderation_mailer/destroy.text.haml
index 1e7fa269..cb64e2d9 100644
--- a/app/views/moderation_mailer/destroy.text.haml
+++ b/app/views/moderation_mailer/destroy.text.haml
@@ -1,6 +1,6 @@
 = t '.body', subject: @event.title, author: @current_user
 \
-= @event.reason_for_deletion
+= @event.reason
 \
 = t '.reminder'
 = render file: '/events/show'
diff --git a/app/views/moderations/refuse.html.haml b/app/views/moderations/refuse.html.haml
index db6c9934..b24ffe42 100644
--- a/app/views/moderations/refuse.html.haml
+++ b/app/views/moderations/refuse.html.haml
@@ -1,35 +1,37 @@
 %h2
   %em.fa.fa-exclamation-triangle
-  =t '.title'
+  = t '.title'
 
-= form_tag moderation_path(@moderation), method: :delete do |f|
-  .field.closer(title="#{t '.reason_r_1_long'}")
+= form_for @moderation, url: { action: :destroy },
+  html: { method: :delete } do |f|
+  .field.closer{ title: t('.reason_r_1_long') }
     = radio_button_tag :reason, :r_1, params[:event] == 'reason_r_1'
     = label_tag :reason_r_1, t('.reason_r_1')
 
-  .field.closer(title="#{t '.reason_r_2_long'}")
+  .field.closer{ title: t('.reason_r_2_long') }
     = radio_button_tag :reason, :r_2, params[:event] == 'reason_r_2'
     = label_tag :reason_r_2, t('.reason_r_2')
 
-  .field.closer(title="#{t '.reason_r_3_long'}")
+  .field.closer{ title: t('.reason_r_3_long') }
     = radio_button_tag :reason, :r_3, params[:event] == 'reason_r_3'
     = label_tag :reason_r_3, t('.reason_r_3')
 
-  .field.opener(title="#{t '.reason_r_4_long'}")
-    = radio_button_tag :reason, :r_4, params[:event] == 'reason_r_4' || !params[:event]
+  .field.opener{ title: t('.reason_r_4_long') }
+    = radio_button_tag :reason, :r_4,
+      params[:event] == 'reason_r_4' || !params[:event]
     = label_tag :reason_r_4, t('.reason_r_4')
 
   .field
-    = label_tag :reason_text, t('.reason')
-    = text_area_tag :reason_text, nil, cols: 40, rows: 5
+    = label_tag :reason
+    = f.text_area :reason, cols: 40, rows: 5
 
   = link_to moderations_path do
     %em.fa.fa-arrow-left
-    =t '.ko'
+    = t '.ko'
 
   = button_tag do
     %em.fa.fa-thumbs-down
-    =t '.ok'
+    = t '.ok'
 
 %fieldset
   %legend
diff --git a/config/initializers/paper_trail.rb b/config/initializers/paper_trail.rb
new file mode 100644
index 00000000..39a66791
--- /dev/null
+++ b/config/initializers/paper_trail.rb
@@ -0,0 +1 @@
+PaperTrail.config.track_associations = false
diff --git a/config/locales/views/en.yml b/config/locales/views/en.yml
index b14e99f1..dbc7b543 100644
--- a/config/locales/views/en.yml
+++ b/config/locales/views/en.yml
@@ -208,7 +208,7 @@ don't hesitate to repeat each time these informations, they are important.
 \nWe strongly invite you to submit again this event with a more complete
 description."
       reason_r_3_long: Your event is relevant, but has already been submitted.
-      reason: Your reason
+      reason_text: Your reason
     destroy:
       ok: Event rejected
   notes:
diff --git a/config/locales/views/fr.yml b/config/locales/views/fr.yml
index cf049e34..23955d1e 100644
--- a/config/locales/views/fr.yml
+++ b/config/locales/views/fr.yml
@@ -209,7 +209,7 @@ répéter à chaque fois ces informations, elles sont importantes.
 description plus complète."
       reason_r_3_long: Votre événement a tout à fait sa place ici, mais il a
         déjà été enregistré.
-      reason: Votre raison
+      reason_text: Votre raison
     destroy:
       ok: Événement rejeté
   notes:
diff --git a/lib/differ/format/patch.rb b/lib/differ/format/patch.rb
index c021171e..7bf62db3 100644
--- a/lib/differ/format/patch.rb
+++ b/lib/differ/format/patch.rb
@@ -5,12 +5,11 @@ module Differ
     module Patch
       class << self
         def format(change)
-          case
-          when change.change?
+          if change.change?
             as_change change
-          when change.delete?
+          elsif change.delete?
             as_delete change
-          when change.insert?
+          elsif change.insert?
             as_insert change
           else
             ''
diff --git a/test/controllers/moderations_controller_test.rb b/test/controllers/moderations_controller_test.rb
index 5fc71cd9..9d61e65f 100644
--- a/test/controllers/moderations_controller_test.rb
+++ b/test/controllers/moderations_controller_test.rb
@@ -92,7 +92,7 @@ class ModerationsControllerTest < ActionController::TestCase
 
   test 'should reject event' do
     assert_difference 'Event.count', -1 do
-      delete :destroy, id: @moderation
+      delete :destroy, id: @moderation, event: {}
     end
 
     assert_empty assigns(:moderation).errors
@@ -102,7 +102,7 @@ class ModerationsControllerTest < ActionController::TestCase
 
   test 'should reject event with a reason' do
     assert_difference 'Event.count', -1 do
-      delete :destroy, id: @moderation, reason: 'r_4'
+      delete :destroy, id: @moderation, reason: 'r_4', event: {}
     end
 
     assert_empty assigns(:moderation).errors
diff --git a/test/mailers/event_mailer_test.rb b/test/mailers/event_mailer_test.rb
index be74ee04..c45adf97 100644
--- a/test/mailers/event_mailer_test.rb
+++ b/test/mailers/event_mailer_test.rb
@@ -24,7 +24,7 @@ class EventMailerTest < ActionMailer::TestCase
 
   test 'destroy' do
     event = Event.last
-    event.reason_for_deletion = 'hello world'
+    event.reason = 'hello world'
     mail = EventMailer.destroy Event.last
     assert_match(/Événement .* refusé/, mail.subject)
     assert_equal [Event.last.contact], mail.to
diff --git a/test/mailers/moderation_mailer_test.rb b/test/mailers/moderation_mailer_test.rb
index 1f1a30d4..654e0d9d 100644
--- a/test/mailers/moderation_mailer_test.rb
+++ b/test/mailers/moderation_mailer_test.rb
@@ -42,7 +42,7 @@ hello world'
 
   test 'destroy' do
     event = Event.unscoped.last
-    event.reason_for_deletion = 'hello world'
+    event.reason = 'hello world'
     mail = ModerationMailer.destroy event
     assert_match(/Événement .* refusé/, mail.subject)
     assert_equal ['moderateurs@agendadulibre.org'], mail.to
diff --git a/test/mailers/previews/event_mailer_preview.rb b/test/mailers/previews/event_mailer_preview.rb
index c665db26..ff8c6534 100644
--- a/test/mailers/previews/event_mailer_preview.rb
+++ b/test/mailers/previews/event_mailer_preview.rb
@@ -16,7 +16,7 @@ class EventMailerPreview < ActionMailer::Preview
   def destroy
     ActionMailer::Base.default_url_options[:host] = 'localhost:3000'
     event = Event.last
-    event.reason_for_deletion = 'hello world'
+    event.reason = 'hello world'
     EventMailer.destroy event
   end
 end
diff --git a/test/mailers/previews/moderation_mailer_preview.rb b/test/mailers/previews/moderation_mailer_preview.rb
index 1567e0ad..0131db8a 100644
--- a/test/mailers/previews/moderation_mailer_preview.rb
+++ b/test/mailers/previews/moderation_mailer_preview.rb
@@ -29,7 +29,7 @@ hello world'
   def destroy
     ActionMailer::Base.default_url_options[:host] = 'localhost:3000'
     event = Event.last
-    event.reason_for_deletion = 'hello world'
+    event.reason = 'hello world'
     ModerationMailer.destroy event
   end
 end
diff --git a/test/mailers/previews/orga_mailer_preview.rb b/test/mailers/previews/orga_mailer_preview.rb
index 6505f7ae..04c6f2cc 100644
--- a/test/mailers/previews/orga_mailer_preview.rb
+++ b/test/mailers/previews/orga_mailer_preview.rb
@@ -25,7 +25,7 @@ class OrgaMailerPreview < ActionMailer::Preview
   def destroy
     ActionMailer::Base.default_url_options[:host] = 'localhost:3000'
     orga = Orga.last
-    # orga.reason_for_deletion = 'hello world'
+    # orga.reason = 'hello world'
     OrgaMailer.destroy orga
   end
 end