Rails Console - Deprecation Notices After Updating Gems

Question

I ran bundler update on my rails 6 project and now see the following deprecation notice when I run rails console. Anyone know off hand which is the offending combo of incompatible gem/ruby version?

Deprecation Notice:

root@1ddbacaf4a69:/app# bin/rails c
Top level ::CompositeIO is deprecated, require 'multipart/post' and use `Multipart::Post::CompositeReadIO` instead!
Top level ::Parts is deprecated, require 'multipart/post' and use `Multipart::Post::Parts` instead!

Ruby version: 3.1.2

Google and github has not been too much help. I don't want to start disabling gems one at a time to figure it out.

Answer 1

UPDATE:

TLDR; this error is most commonly caused by faraday-multipart dependency on multipart-post. faraday-multipart has released a fix for this - simply upgrading the gem to 1.0.4 or newer should resolve this issue.

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Further digging, I found the offending piece of code:

multipart-post/lib/composite_io.rb:

warn "Top level ::CompositeIO is deprecated, require 'multipart/post' and use `Multipart::Post::CompositeReadIO` instead!"

Which is being used by:

Gemfile.lock:

    faraday (1.10.0)
      faraday-em_http (~> 1.0)
      faraday-em_synchrony (~> 1.0)
      faraday-excon (~> 1.1)
      faraday-httpclient (~> 1.0)
      faraday-multipart (~> 1.0)
    ...
    faraday-multipart (1.0.3)
      multipart-post (>= 1.2, < 3)

Which leads me to this issue: https://github.com/lostisland/faraday-multipart/issues/5

Bottom line answer - there is a fix for this which should be merged and released in a few days. bundle update again and this should go away when faraday libraries are updated.