为什么缺少一些 rake 任务？
我的 rake -T 清单中缺少所有 db:test:* rake 任务，但我仍然能够正常调用它们。什么可能导致这种情况？
All of the db:test:* rake tasks are missing from my rake -T listing, but I am still able to call them normally. What could cause this?
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显然，Rails 团队认为 rake -T 给出了太多输出；许多 Rake 任务的描述都被注释掉了。请参阅 https://github.com/rails/rails/commit/29acc17 和 https://github.com/rails/rails/commit/9838156 示例（其中包括来自
db:test:*的一些任务）。Apparently the Rails team decided that
rake -Tgave too much output; many of the descriptions of the Rake tasks are commented out. See https://github.com/rails/rails/commit/29acc17 and https://github.com/rails/rails/commit/9838156 for an example (which includes some tasks fromdb:test:*).我觉得他们也可以单独切换来列出所有命令。但在完成之前，我建议使用rake -P，因为它将列出所有可用的命令及其依赖项（遗憾的是没有描述），这有点过头了。如果您使用的是类似 Linux 的操作系统，那么在列表中使用 grep 将为您提供更精确的列表。
I feel that they could have made a separate switch for listing all commands as well. But until that is done, I recommend using rake -P as it will list all the available commands and their dependencies -sadly without descriptions-, which is a bit overdoing the job. If you are on Linux like OS then using grep on the list will give you a more refined list.