Fix dirty tracking after rollback.

Currently the rollback only restores primary key value, `new_record?`,
`destroyed?`, and `frozen?`. Since the `save` clears current dirty
attribute states, retrying save after rollback will causes no change
saved if partial writes is enabled (by default).

This makes `remember_transaction_record_state` remembers original values
then restores dirty attribute states after rollback.

Fixes #15018.
Fixes #30167.
Fixes #33868.
Fixes #33443.
Closes #33444.
Closes #34504.

1 files changed, 59 insertions, 0 deletions

diff --git a/activerecord/test/cases/transactions_test.rb b/activerecord/test/cases/transactions_test.rb
index 7bad3de343..6795996cca 100644
--- a/activerecord/test/cases/transactions_test.rb
+++ b/activerecord/test/cases/transactions_test.rb
@@ -18,6 +18,65 @@ class TransactionTest < ActiveRecord::TestCase
     @first, @second = Topic.find(1, 2).sort_by(&:id)
   end
 
+  def test_rollback_dirty_changes
+    topic = topics(:fifth)
+
+    ActiveRecord::Base.transaction do
+      topic.update(title: "Ruby on Rails")
+      raise ActiveRecord::Rollback
+    end
+
+    title_change = ["The Fifth Topic of the day", "Ruby on Rails"]
+    assert_equal title_change, topic.changes["title"]
+  end
+
+  def test_rollback_dirty_changes_multiple_saves
+    topic = topics(:fifth)
+
+    ActiveRecord::Base.transaction do
+      topic.update(title: "Ruby on Rails")
+      topic.update(title: "Another Title")
+      raise ActiveRecord::Rollback
+    end
+
+    title_change = ["The Fifth Topic of the day", "Another Title"]
+    assert_equal title_change, topic.changes["title"]
+  end
+
+  def test_rollback_dirty_changes_then_retry_save
+    topic = topics(:fifth)
+
+    ActiveRecord::Base.transaction do
+      topic.update(title: "Ruby on Rails")
+      raise ActiveRecord::Rollback
+    end
+
+    title_change = ["The Fifth Topic of the day", "Ruby on Rails"]
+    assert_equal title_change, topic.changes["title"]
+
+    assert topic.save
+
+    assert_equal title_change, topic.saved_changes["title"]
+    assert_equal topic.title, topic.reload.title
+  end
+
+  def test_rollback_dirty_changes_then_retry_save_on_new_record
+    topic = Topic.new(title: "Ruby on Rails")
+
+    ActiveRecord::Base.transaction do
+      topic.save
+      raise ActiveRecord::Rollback
+    end
+
+    title_change = [nil, "Ruby on Rails"]
+    assert_equal title_change, topic.changes["title"]
+
+    assert topic.save
+
+    assert_equal title_change, topic.saved_changes["title"]
+    assert_equal topic.title, topic.reload.title
+  end
+
   def test_persisted_in_a_model_with_custom_primary_key_after_failed_save
     movie = Movie.create
     assert_not_predicate movie, :persisted?