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ruby-on-railsamazon-s3rails-activestorage

Unknown keyword: content_type in active storage 5.2.1.1

If you update rails to 5.2.1.1 to avoid a potential bug in active storage (info released around 27. November 2018) then be advised that this causes a bug when uploading files to Amazon S3.

ArgumentError: unknown keyword: content_type

Can be fixed by upgrading rails in your gemfile to 

gem 'rails', '5.2.2.rc1'
Solution

  • Upgrade to 

    gem 'rails', '5.2.2.rc1'