Merge branch 'rm-trasaction-fix-13166'

Conflicts:
	activerecord/CHANGELOG.md

Backport of #13166

activerecord/CHANGELOG.md

@@ -1,3 +1,9 @@
+*   Keep track of dirty attributes after transaction is rollback.
+
+    Related #13166.
+
+    *Bogdan Gusiev* *arthurnn*
+
 *   Revert the behaviour of `ActiveRecord::Relation#join` changed through 4.0 => 4.1 to 4.0.
 
     In 4.1.0 `Relation#join` is delegated to `Arel#SelectManager`.

activerecord/lib/active_record/transactions.rb

@@ -350,6 +350,7 @@ def remember_transaction_record_state #:nodoc:
       end
       @_start_transaction_state[:level] = (@_start_transaction_state[:level] || 0) + 1
       @_start_transaction_state[:frozen?] = @attributes.frozen?
+      @_start_transaction_state[:changed_attributes] ||= changed_attributes
     end
 
     # Clear the new record state and id of a record.
@@ -368,6 +369,9 @@ def restore_transaction_record_state(force = false) #:nodoc:
           @attributes = @attributes.dup if @attributes.frozen?
           @new_record = restore_state[:new_record]
           @destroyed  = restore_state[:destroyed]
+          changed_attributes.replace(restore_state[:changed_attributes]).delete_if do |attribute, old_value|
+            old_value == @attributes[attribute]
+          end
           if restore_state.has_key?(:id)
             write_attribute(self.class.primary_key, restore_state[:id])
           else

activerecord/test/cases/transactions_test.rb

@@ -274,6 +274,48 @@ def test_invalid_keys_for_transaction
     end
   end
 
+  def test_rollback_when_changing_inside_transaction
+    assert !@first.approved?
+    Topic.transaction do
+      @first.approved = true
+      @first.save!
+      raise ActiveRecord::Rollback
+    end
+    assert @first.approved
+    assert @first.changes["approved"]
+    @first.save!
+    assert @first.reload.approved
+  end
+
+  def test_rollback_when_changing_outside_transaction
+    assert !@first.approved?
+    @first.approved = true
+    Topic.transaction do
+      @first.save!
+      raise ActiveRecord::Rollback
+    end
+    assert @first.changes["approved"]
+    assert @first.approved
+    @first.save!
+    assert @first.reload.approved
+  end
+
+  def test_rollback_when_changing_back_to_prev_stage
+    assert !@first.approved?
+    Topic.transaction do
+      @first.approved = true
+      @first.save!
+      @first.approved = false
+      @first.save!
+      raise ActiveRecord::Rollback
+    end
+    assert !@first.approved
+    assert !@first.changes["approved"]
+    @first.save!
+    assert !@first.reload.approved
+  end
+
+
   def test_force_savepoint_in_nested_transaction
     Topic.transaction do
       @first.approved = true