In our Rails databases, we use multiple Postgres schemas. This is partly for partitioning archive data from fresh data. On a new Rails 5 project, I started having tests fail once the models had the "archivable" concern added, which depended on an archive schema existing.
Ultimately, the problem is that the archive schema wasn't being created in the test database, because
rake db:test:prepare performs a
db:test:load which was loading the
db/schema.rb, which is completely ignorant of the Postgres-specific schema concept.
In order to fix this without attempting ugly hacks, the simplest solution was just to switch to using
structure.sql for the Rails schema dump.
config/application.rb, insert the following in your
Application class definition:
config.active_record.schema_format = :sql
If you haven't already added the additional schema(s) to your
schema_search_path in your
You'll need to run
rake db:migrate to force
structure.sql generation before running tests again. Also, be sure to switch from
structure.sql if you're committing this file.