nownabe/database_cleaner-spanner

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example/rails/config/database.yml

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default: &default
  adapter: spanner
  instance: <%= ENV.fetch("SPANNER_INSTANCE") %>
  database: <%= ENV.fetch("SPANNER_DATABASE", "my-app") %>
  project: <%= ENV.fetch("SPANNER_EMULATOR_HOST", nil) ? "my-project" : "null" %>

development:
  <<: *default

# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
  <<: *default
  database: <%= ENV.fetch("SPANNER_DATABASE", "my-app") %>-test

production:
  <<: *default