Fix state being carried over from previous transaction

This clears the transaction record state when the transaction finishes
with a `:committed` status.

Considering the following example where `name` is a required attribute.
Before we had `new_record?` returning `true` for a persisted record:

```ruby
  author = Author.create! name: 'foo'
  author.name = nil
  author.save        # => false
  author.new_record? # => true
```

1 files changed, 1 insertions, 1 deletions

diff --git a/actionpack/test/controller/parameters/parameters_permit_test.rb b/actionpack/test/controller/parameters/parameters_permit_test.rb
index 2dd2826196..9f7d14e85d 100644
--- a/actionpack/test/controller/parameters/parameters_permit_test.rb
+++ b/actionpack/test/controller/parameters/parameters_permit_test.rb
@@ -199,7 +199,7 @@ class ParametersPermitTest < ActiveSupport::TestCase
     assert_equal nil, @params.fetch(:foo) { nil }
   end
 
-  test 'KeyError in fetch block should not be coverd up' do
+  test 'KeyError in fetch block should not be covered up' do
     params = ActionController::Parameters.new
     e = assert_raises(KeyError) do
       params.fetch(:missing_key) { {}.fetch(:also_missing) }