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      We have upgraded to ruby 2.6. Officially the appropriate version of rails that works with any ruby version higher than 2.5 (and lower than 3.0) is 6.0.

      What to do:

      • check for deprecation messages in current production logs
      • go through existing code comments related to Ruby 2.4, 2.5 and 2.6 and Rails 5.1, 5.2 , 6.0
      • upgrade Rails and dependent gems
      • go through upgrade guide points 1 and 2
      • another set of upgrade notes
      • go through notable changes in release notes
      • remove workarounds and monkey patches in code pointed to by `rg -i "rails.*5\.2"` also 6.0 and 6.1
      • regenerate database schema as Rails 6.0 updated format
      • make sure oracle-enhanced works
      • Set load_defaults to 6.0 at application.rb

      The list in THREESCALE-8607 can be done after the upgrade.

      Note about dependencies: https://www.fastruby.io/blog/ruby/rails/versions/compatibility-table.html

              Unassigned Unassigned
              tmaas-1 Thomas Maas
              Dominik Hlavac Duran Dominik Hlavac Duran
              Joan Lledo Joan Lledo
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