Auto migrate test database schema

Related: Db:drop, create & migrate behavior with RAILS_ENV=development - A May Of WTFs - Ruby on Rails Discussions

Not sure if we have explored this before, but Rails can automatically maintain test databse schema with ActiveRecord::Migration.maintain_test_schema! (method definition, in rails/test_help, in latest rspec/rails helper generator)

Here is a diff to incorporate it into Discourse’s spec/rails_helper:

However, it fails on my Docker-based development setup:

ActiveRecord::StatementInvalid: PG::InsufficientPrivilege: ERROR:  must be owner of database discourse_test

This is because maintain_test_schema! utilizes db:test:prepare, and tries to drop the test database first, to which (I believe) the discourse user on Docker-based setup does not have access.

Could someone with a native dev setup could try it out? If it works, maybe the change is worth considering?


I applied that diff and dropped by databases then ran
bin/rails db:create
bin/rails db:migrate

then chose a random spec

▶ bundle exec rspec spec/requests/permalinks_controller_spec.rb 
An error occurred while loading ./spec/requests/permalinks_controller_spec.rb.
Failure/Error: Group.find_by(id: id)

  PG::UndefinedTable: ERROR:  relation "groups" does not exist
  LINE 8:  WHERE a.attrelid = '"groups"'::regclass
# ./app/models/group.rb:532:in `lookup_group'
# ./app/models/group.rb:516:in `block in ensure_automatic_groups!'
# ./app/models/group.rb:515:in `each_key'
# ./app/models/group.rb:515:in `ensure_automatic_groups!'
# (eval):3:in `block (2 levels) in run_file'
# ./spec/rails_helper.rb:79:in `<top (required)>'
# ./spec/requests/permalinks_controller_spec.rb:3:in `require'
# ./spec/requests/permalinks_controller_spec.rb:3:in `<top (required)>'
# ------------------
# --- Caused by: ---
# PG::UndefinedTable:
#   ERROR:  relation "groups" does not exist
#   LINE 8:  WHERE a.attrelid = '"groups"'::regclass
#                               ^
#   ./app/models/group.rb:532:in `lookup_group'
No examples found.

Finished in 0.00003 seconds (files took 1.6 seconds to load)
0 examples, 0 failures, 1 error occurred outside of examples

I never got into config.before('suite')