replace user-id in timelines options w/ deleted user id

app/models/user.rb

@@ -159,6 +159,7 @@ class User < Principal
   before_create :sanitize_mail_notification_setting
   before_destroy :delete_associated_private_queries
   before_destroy :reassign_associated
+  before_destroy :remove_from_filter
 
   scope :in_group, lambda {|group|
     group_id = group.is_a?(Group) ? group.id : group.to_i
@@ -813,6 +814,27 @@ class User < Principal
     (passwords[keep_count..-1] || []).each { |p| p.destroy }
   end
 
+  def remove_from_filter
+    timelines_filter = ["planning_element_responsibles", "planning_element_assignee", "project_responsibles"]
+    substitute = DeletedUser.first
+
+    timelines = Timeline.all(:conditions => ['options LIKE ?', "%#{id}%"])
+
+    timelines.each do |timeline|
+      timelines_filter.each do |field|
+        changed = false
+
+        fieldOptions = timeline.options[field]
+        if fieldOptions && index = fieldOptions.index(id.to_s) then
+          changed = true
+          fieldOptions[index] = substitute.id.to_s
+        end
+      end
+
+      timeline.save! if changed
+    end
+  end
+
   def reassign_associated
     substitute = DeletedUser.first