Olá!
Estou na revisão 136a5456534c7e468b8052f865ce970a3bf375e9, onde executar multisite:migrate falha com:
I, [2020-05-07T06:57:21.288947 #1] INFO -- : > cd /var/www/discourse && sudo -Eu discourse bundle exec rake multisite:migrate
`/root` não tem permissão de escrita.
O Bundler usará `/tmp/bundler20200507-300-1g5pu90300' como seu diretório home temporariamente.
rake aborted!
NoMethodError: método `call` não definido para [:delete, RailsMultisite::Middleware]:Array
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/railties-6.0.3/lib/rails/configuration.rb:76:in `block in merge_into'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/railties-6.0.3/lib/rails/configuration.rb:75:in `each'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/railties-6.0.3/lib/rails/configuration.rb:75:in `merge_into'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/railties-6.0.3/lib/rails/engine.rb:512:in `block in app'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/railties-6.0.3/lib/rails/engine.rb:509:in `synchronize'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/railties-6.0.3/lib/rails/engine.rb:509:in `app'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/railties-6.0.3/lib/rails/application/finisher.rb:97:in `block in <module:Finisher>'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/railties-6.0.3/lib/rails/initializable.rb:32:in `instance_exec'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/railties-6.0.3/lib/rails/initializable.rb:32:in `run'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/railties-6.0.3/lib/rails/initializable.rb:61:in `block in run_initializers'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/railties-6.0.3/lib/rails/initializable.rb:60:in `run_initializers'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/railties-6.0.3/lib/rails/application.rb:363:in `initialize!'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/railties-6.0.3/lib/rails/railtie.rb:190:in `public_send'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/railties-6.0.3/lib/rails/railtie.rb:190:in `method_missing'
/var/www/discourse/config/environment.rb:7:in `<top (required)>'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.0/lib/zeitwerk/kernel.rb:23:in `require'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/zeitwerk-2.3.0/lib/zeitwerk/kernel.rb:23:in `require'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activesupport-6.0.3/lib/active_support/dependencies.rb:324:in `block in require'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activesupport-6.0.3/lib/active_support/dependencies.rb:291:in `load_dependency'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activesupport-6.0.3/lib/active_support/dependencies.rb:324:in `require'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/railties-6.0.3/lib/rails/application.rb:339:in `require_environment!'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/railties-6.0.3/lib/rails/application.rb:523:in `block in run_tasks_blocks'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/rake-13.0.1/exe/rake:27:in `<top (required)>'
/usr/local/bin/bundle:23:in `load'
/usr/local/bin/bundle:23:in `<main>'
Tasks: TOP => multisite:migrate => db:load_config => environment
(Veja o rastreamento completo executando a tarefa com --trace)
I, [2020-05-07T06:57:26.316379 #1] INFO -- :
Parece que isso está relacionado à manipulação de middlewares em config/initializers/200-first_middlewares.rb.
Voltando para antes da revisão 136a5456534c7e468b8052f865ce970a3bf375e9, o commit que atualiza para o Rails 6.0.3, o multisite:migrate funciona. Também tenho uma instância de desenvolvimento na qual substituí session_operations por .delete e .unshift em Rails.configuration.middleware, e parece estar funcionando bem com o resultado.
(… exceto pela migração 20141216112341_resolve_duplicate_group_names falhando, alegando uma coluna inexistente groups.automatic_membership_email_domains, mas isso desaparece ao ser reexecutada.)
Esqueci quase tudo o que costumava saber sobre Rails, então posso estar completamente errado aqui!
