ruby-on-rails - rake 中止!不知道如何构建任务

Question

我在 semester.rake 有一个 rake 任务文件。看起来像这样

namespace :db do
  desc "generate semester data"
  task semester: :environment do
    semester = Semester.create!(name: "SummerSemseter")
    semester = Semester.create!(name: "WinterSemester")
    semester = Semester.create!(name: "Spring Semester")        
  end
end

我以 rake semester 运行任务.这给了我错误

rake aborted!
Don't know how to build task 'semester' (see --tasks)
/home/john/.rvm/gems/ruby-2.2.4/gems/rake-11.3.0/exe/rake:27:in `<top (required)>'
/home/john/.rvm/gems/ruby-2.2.4/bin/ruby_executable_hooks:15:in `eval'
/home/john/.rvm/gems/ruby-2.2.4/bin/ruby_executable_hooks:15:in `<main>'
(See full trace by running task with --trace)

为什么我会收到此错误以及解决方案是什么？

Answer 1

您的 semester任务位于命名空间 db .

因此，您需要使用以下命令运行它:

rake db:semester