Get rid of deprecation warning to change content_type to media_type in Rails 6

[siruguri]

I am seeing this error in my app while I test upgrading to Rails 6.0.0.rc2

DEPRECATION WARNING: Rails 6.1 will return Content-Type header without modification. If you want just the MIME type, please use `#media_type` instead. (called from append_info_to_payload at /Users/sameer/.rvm/gems/ruby-2.6.3/gems/skylight-core-4.1.2/lib/skylight/core/probes/action_controller.rb:15)

The relevant line does this:

type_str = content_type.to_s.split(';').first

[zvkemp]

Thanks @siruguri. We have a branch in progress that will fix this issue, and will notify you here when it has been released.

[zvkemp]

@siruguri in the meantime you can silence the warnings and return to the previous behavior of content_type by setting config.action_dispatch.return_only_media_type_on_content_type = false

[olly]

@zvkemp I've just tried upgrading an application to Rails v6, and just a heads up, that setting doesn't seem to disable the deprecation warning. (Also removing the skylight gem, removed the deprecation warnings, so I'm pretty sure there wasn't some other culprit).

[zvkemp]

This is fixed as of Skylight 4.2.0-beta (current prerelease version is 4.2.0-beta3). @olly Could you let me know what version(s) of Skylight you tried, and could you confirm that you fully restarted your application after making that config change?

[olly]

@zvkemp you're right. I think I must have had some weird interaction with the spring preloader. That configuration setting does seem to fix it. Thanks. Sorry for the noise.