# Multisite:migrate broken since Rails 6.0.3 update

**URL:** <https://meta.discourse.org/t/multisite-migrate-broken-since-rails-6-0-3-update/150691>\
**Category:** Bug\
**Created:** [May 7, 2020, 8:13am UTC](https://meta.discourse.org/t/multisite-migrate-broken-since-rails-6-0-3-update/150691 "2020-05-07T08:13:44Z")\
**Posts on this page:** 1\
**Showing post:** 1

<div class="post-metadata">

**Author:** ![jashankj](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/jashankj/32/179611_2.png) [@jashankj](https://meta.discourse.org/u/jashankj)\
**Post date:** [May 7, 2020, 8:13am UTC](https://meta.discourse.org/t/multisite-migrate-broken-since-rails-6-0-3-update/150691/1 "2020-05-07T08:13:44Z")

</div>

Hello!

I’m on revision 136a5456534c7e468b8052f865ce970a3bf375e9, where doing a `multisite:migrate` fails with

```plaintext
I, [2020-05-07T06:57:21.288947 #1] INFO -- : > cd /var/www/discourse && sudo -Eu discourse bundle exec rake multisite:migrate
`/root` is not writable.
Bundler will use `/tmp/bundler20200507-300-1g5pu90300' as your home directory temporarily.
rake aborted!
NoMethodError: undefined method `call' for [: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
(See full trace by running task with --trace)
I, [2020-05-07T06:57:26.316379 #1] INFO -- : 

```

It looks like this is related to middleware manipulation in `config/initializers/200-first_middlewares.rb`.

Rewinding to before 136a5456534c7e468b8052f865ce970a3bf375e9, the commit that bumps to Rails 6.0.3, allows multisite:migrate to work. I’ve also got a development instance in which I’ve replaced the `session_operations` with a `.delete` and `.unshift` on `Rails.configuration.middleware`, and it seems happy with the result.

(… modulo migration 20141216112341\_resolve\_duplicate\_group\_names failing, claiming a nonexistent column `groups.automatic_membership_email_domains`, but that goes away when retried.)

I’ve forgotten most all of what I used to know about Rails, so I might be entirely wrong here!

---

_[View the full topic](https://meta.discourse.org/t/multisite-migrate-broken-since-rails-6-0-3-update/150691)._