用于安装仅执行一次的gem迁移的Rake任务

Question

为什么这个rake任务

gems = %w(gem1 gem2 gem3)
namespace :gems do
  namespace :install do
    desc "Runs install:migrations for all gems"
    task :migrations do
      gems.each do |gem_name|
        print "\nInstalling migrations for the #{gem_name} gem...\n"
        Rake::Task["#{gem_name}:install:migrations"].invoke
      end
      print "\n\nGem migrations installed."
    end
  end
end

实际上只运行第一组迁移,无论我使用的gems/gem order/random调用reenable？

Installing migrations for the gem1 gem...
Copied migration whatever from gem1
Copied migration whatever from gem1
Copied migration whatever from gem1
Copied migration whatever from gem1

Installing migrations for the gem2 gem...
(nothing)

Installing migrations for the gem3 gem...
(nothing)

Gem migrations installed.

Answer 1

该invoke方法仅"按需"运行,这基本上意味着一旦运行一次,除非重新启用,否则它不会再次运行.

您可以.reenable在每个之后调用.invoke以重置它,也可以使用该.execute命令来运行任务.

需要注意的.execute是,如果你拥有它们,它将不会运行任务的依赖项.

为什么Rake不能连续调用多个任务？

如何从Rake任务中运行Rake任务？