请尝试以下两种方法:
开发模式,使用不同的环境变量设置数据库:
SKIP_DB_AND_REDIS=1 DISCOURSE_DEV_DB='nonexistent' bin/rails runner "puts 'booted successfully'"
测试模式,加载插件:
LOAD_PLUGINS=1 RAILS_ENV=test SKIP_DB_AND_REDIS=1 RAILS_DB='nonexistent' bin/rails runner "puts 'booted successfully'"