Due to different way of naming nested fields introduced in this commit:
nested_form stoped working - it was not adding middle part with either object id or timestamp. This commit may not be the best possible solution, but makes it work in rails4 and preserves compatibility with rails3
make nested_form work on rails4
At some point it was needed to work well with edge rails (rails4). As i have tested it today (with edge version as well), it no longer works. Reverting this commit was needed. So it needs to be verified once more, but from what I can say now, this PR is not needed anymore. In fact - in should not be merged.