Fix crash with protected_attributes and rails 4.2

[brauliobo]

No description provided.

[sneakernets]

Thanks for figuring this out!

[pothoven]

Thanks for the fix!
Before I pull it in, I noticed you removed checks and alternative code for various Rails versions. Will this work for all versions? Other than needing to switch the assignment syntax back to ":content_type =>" instead of the newer "content_type:" to ensure back-level compatibility, I would think it should work.

[pothoven]

There was already another proposed fix for this problem in this pull request (#13) that I hadn't seen until I saw yours. Any thoughts on it compared to yours?

[brauliobo]

This PR uses the send("#{attr}=", value) which is agnotisc of where the protected_attributes is being used or not. This also simplified the code and made the version check not necessary anymore.

[pothoven]

I agree. While I like that PR #13 was able to fix it with a 1 liner, I like that your fix also simplified the code. I'll pull in your fix and make a new version of the gem.

[brauliobo]

thanks @pothoven, I'll remove the monkey patch in my code :)