Solve both sides of the missing fields bug, not only one

app/helpers/object_versions_helper.rb

@@ -1,10 +1,15 @@
 module ObjectVersionsHelper
   def attach_existing_fields(version, new_object)
-    version.object_changes.to_h.each do |k, v|
-      method_name = "#{k}=".to_sym
+    version.object_changes.to_h.each do |key, value|
+      method_name = "#{key}=".to_sym
       if new_object.respond_to?(method_name)
-        new_object.public_send(method_name, v.last)
+        new_object.public_send(method_name, value.last)
       end
     end
   end
+
+  def only_present_fields(version, model)
+    field_names = model.column_names
+    version.object.to_h.select { |key, _value| field_names.include?(key) }
+  end
 end

app/views/admin/contact_versions/index.haml

@@ -57,8 +57,9 @@
         %tbody
           - @versions.each do |version|
             - if version
-            - contact = Contact.new(version.object.to_h)
-            - attach_existing_fields(version, contact)
+              - attributes = only_present_fields(version, Contact)
+              - contact = Contact.new(attributes)
+              - attach_existing_fields(version, contact)
 
               %tr
                 %td= link_to(contact.name, admin_contact_version_path(version.id))

app/views/admin/contact_versions/show.haml

@@ -1,4 +1,5 @@
-- contact = Contact.new(@version.object.to_h)
+- attributes = only_present_fields(@version, Contact)
+- contact = Contact.new(attributes)
 - attach_existing_fields(@version, contact)
 = render 'shared/title', name: contact.name
 

app/views/admin/domain_versions/archive.haml

@@ -55,7 +55,8 @@
         %tbody
           - @versions.each do |version|
             - if version
-              - domain = Domain.new(version.object.to_h)
+              - attributes = only_present_fields(version, Domain)
+              - domain = Domain.new(attributes)
               - attach_existing_fields(version, domain)
 
               %tr

app/views/admin/domain_versions/show.haml

@@ -1,4 +1,5 @@
-- domain = Domain.new(@version.object.to_h)
+- present_fields = only_present_fields(@version, Domain)
+- domain = Domain.new(present_fields)
 - attach_existing_fields(@version, domain)
 
 - if @version

test/integration/admin/contact_versions_test.rb

@@ -27,7 +27,7 @@ class ContactVersionsTest < ActionDispatch::IntegrationTest
       INSERT INTO log_contacts (item_type, item_id, event, whodunnit, object,
       object_changes, created_at, session, children, ident_updated_at, uuid)
       VALUES ('Contact', 75, 'update', '1-AdminUser',
-      '{"id": 75, "code": "test_code", "auth_info": "8b4d462aa04194ca78840a", "registrar_id": 75}',
+      '{"id": 75, "code": "test_code", "auth_info": "8b4d462aa04194ca78840a", "registrar_id": 75, "old_field": "value"}',
       '{"other_made_up_field": "value"}',
       '2018-04-23 15:50:48.113491', '2018-04-23 12:44:56',
       '{"legal_documents":[null]}', null, null

test/integration/admin/domain_versions_test.rb

@@ -32,8 +32,8 @@ class DomainVersionsTest < ActionDispatch::IntegrationTest
       object_changes, created_at, nameserver_ids, tech_contact_ids,
       admin_contact_ids, session, children)
       VALUES ('Domain', 54, 'update', '1-AdminUser',
-      '{"id": 54, "registrar_id": 54, "valid_to": "2018-07-23T12:14:05.583+03:00", "registrant_id": 54, "transfer_code": "transfer_code"}',
-      '{"valid_from": "2017-07-23T12:14:05.583+03:00", "foo": "bar", "other_made_up_field": "value"}',
+      '{"id": 54, "registrar_id": 54, "valid_to": "2018-07-23T12:14:05.583+03:00", "registrant_id": 54, "transfer_code": "transfer_code", "valid_from": "2017-07-23T12:14:05.583+03:00"}',
+      '{"foo": "bar", "other_made_up_field": "value"}',
       '2018-04-23 15:50:48.113491', '{}', '{}', '{}', '2018-04-23 12:44:56',
       '{"null_fracdmin_contacts":[108],"tech_contacts":[109],"nameservers":[],"dnskeys":[],"legal_documents":[null],"registrant":[1]}'
       )
@@ -50,6 +50,7 @@ class DomainVersionsTest < ActionDispatch::IntegrationTest
 
   def test_removed_fields_are_not_causing_errors_in_index_view
     visit admin_domain_versions_path
+
     assert_text 'test_registrar'
     assert_text 'test_registrar update 23.04.18, 18:50'
   end