Ruby-on-rails 简单的 rails rake 任务拒绝运行并出现错误“不知道如何构建任务”，为什么？
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Simple rails rake task refuse to run with error "Don't know how to build task", why?
提问by Rubytastic
I have this simple rake task which refuses to run. I just don't see why it looks correct. Who can pinpoint me to the probably very simple mistake I made? Thank you!
我有一个拒绝运行的简单 rake 任务。我只是不明白为什么它看起来是正确的。谁能指出我犯的可能非常简单的错误？谢谢！
/lib/tasks/reindex.rb:
/lib/tasks/reindex.rb:
namespace :db do
desc "Tire reindex profiles"
task :reindex => :environment do
system "cd #{Rails.root} && rake environment tire:import CLASS='Profile' FORCE=true"
end
end
The error:
错误：
rake db:reindex
rake aborted!
Don't know how to build task 'db:reindex'
回答by cjc343
Rename your file to reindex.rakeand it should work.
将您的文件重命名为reindex.rake，它应该可以工作。
Related: How to build task 'db:populate'
回答by esc_rtn
You can also get this error if you forget to put the namespace before your task name. (i.e. :reindex instead of db:reindex)
如果您忘记将命名空间放在任务名称之前，您也会收到此错误。（即 :reindex 而不是 db:reindex）
回答by David Hempy
The file extension for rake tasks must be '.rake'.
rake 任务的文件扩展名必须是“.rake”。
If you named your file as '.rb', then rake will not find it, and you will question your own sanity for several minutes before ending up here.
如果您将文件命名为“.rb”，那么 rake 将找不到它，并且您将在几分钟内质疑自己的理智，然后才到此为止。
回答by Morgan
Don't forget to check that you call the name of the task and not the file name. The best thing is that they be named the same.
不要忘记检查您是否调用了任务的名称而不是文件名。最好的事情是它们的名字相同。
回答by super1ha1
This error happen to me is because the namespace name got underscore
这个错误发生在我身上是因为命名空间名称有下划线
As is: deploy_app (not work)
To be: deployapp (working)
