Restore ActiveRecord states after a rollback for models w/o callbacks

This fixes a regression (#13744) that was caused by 67d8bb9.

In 67d8bb9, we introduced lazy rollback for records, such that the
record's internal states and attributes are not restored immediately
after a transaction rollback, but deferred until they are first
accessed.

This optimization is only performed when the model does not have any
transactional callbacks (e.g. `after_commit` and `after_create`).

Unfortunately, the models used to test the affected codepaths all
comes with some sort of transactional callbacks. Therefore this
codepath remains largely untested until now and as a result there are
a few issues in the implementation that remains hidden until now.

First, the `sync_with_transaction_state` (or more accurately,
`update_attributes_from_transaction_state`) would perform the
synchronization prematurely before a transaction is finalized (i.e.
comitted or rolled back). As a result, when the actuall rollback
happens, the record will incorrectly assumes that its internal states
match the transaction state, and neglect to perform the restore.

Second, `update_attributes_from_transaction_state` calls `committed!`
in some cases. This in turns checks for the `destroyed?` state which
also requires synchronization with the transaction stae, which causes
an infnite recurrsion.

This fix works by deferring the synchronization until the transaction
has been finalized (addressing the first point), and also unrolled
the `committed!` and `rolledback!` logic in-place (addressing the
second point).

It should be noted that the primary purpose of the `committed!` and
`rolledback!` methods are to trigger the relevant transactional
callbacks. Since this code path is only entered when there are no
transactional callbacks on the model, this shouldn't be necessary. By
unrolling the method calls, the intention here (to restore the states
when necessary) becomes more clear.

2 files changed, 7 insertions, 6 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb b/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb
index 2b6685499a..bc4884b538 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb
@@ -23,6 +23,10 @@ module ActiveRecord
         @parent = nil
       end
 
+      def finalized?
+        @state
+      end
+
       def committed?
         @state == :committed
       end
diff --git a/activerecord/lib/active_record/core.rb b/activerecord/lib/active_record/core.rb
index cd8690d500..a4fe1efd33 100644
--- a/activerecord/lib/active_record/core.rb
+++ b/activerecord/lib/active_record/core.rb
@@ -397,13 +397,10 @@ module ActiveRecord
     end
 
     def update_attributes_from_transaction_state(transaction_state, depth)
-      if transaction_state && !has_transactional_callbacks?
+      if transaction_state && transaction_state.finalized? && !has_transactional_callbacks?
         unless @reflects_state[depth]
-          if transaction_state.committed?
-            committed!
-          elsif transaction_state.rolledback?
-            rolledback!
-          end
+          restore_transaction_record_state if transaction_state.rolledback?
+          clear_transaction_record_state
           @reflects_state[depth] = true
         end