Revert "Merge pull request #2 from tsov/mass_assignment_problem"

This reverts commit ec9d59ed79e85997177b4947ae9d3e5b7bd06554, reversing
changes made to 6865c347f1ada3aaffe09592e9053d0f5d69cc2d.
Merge pull request #3 from tsov/revert_pull_request_2

Revert "Merge pull request #2 from tsov/mass_assignment_problem"