Awesome
Attr Accessible TO Strong Params
Automatically convert Rails 3 attr_accessible to Rails 4 Strong Parameter
Installation
$ gem install attr_accessible2strong_params
Usage
$ aa2sp [filename OR dirname OR .]
Run aa2sp .
in your rails root folder and program will do auto convert. Ensure the Git repository is clean. (You don't want to mix up your changes and auto convert changes, right?)