Deconflate organization/conference IDs in role versions

Resolves failing test spec/features/versions_spec.rb:320.

db/migrate/20200331214534_add_organization_to_versions.rb

@@ -0,0 +1,35 @@
+class AddOrganizationToVersions < ActiveRecord::Migration[5.2]
+  def up
+    add_reference :versions, :organization
+    deconflate
+  end
+
+  def down
+    conflate
+    remove_reference :versions, :organization
+  end
+
+  private
+
+  def conflate
+    say 'conflate'
+
+    PaperTrail::Version.where.not(organization_id: nil).each do |version|
+      version.update_attributes conference_id: version.organization_id
+    end
+  end
+
+  def deconflate
+    say 'deconflate'
+
+    PaperTrail::Version.where.not(conference_id: nil).where(item_type: %[Role UsersRole]).each do |version|
+      id = version.conference_id
+
+      if Organization.exists?(id)
+        raise "version #{version.id} conflates organization #{id} with conference #{id}" if Conference.exists?(id)
+
+        version.update_attributes conference_id: nil, organization_id: id
+      end
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20181113195810) do
+ActiveRecord::Schema.define(version: 2020_03_31_214534) do
 
   create_table "answers", force: :cascade do |t|
     t.string "title"
@@ -639,7 +639,9 @@ ActiveRecord::Schema.define(version: 20181113195810) do
     t.text "object_changes"
     t.datetime "created_at"
     t.integer "conference_id"
+    t.integer "organization_id"
     t.index ["item_type", "item_id"], name: "index_versions_on_item_type_and_item_id"
+    t.index ["organization_id"], name: "index_versions_on_organization_id"
   end
 
   create_table "votes", force: :cascade do |t|