ruby-on-rails - 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

只实际运行第一组迁移，不管我使用的 gems/gem 排序/随机调用重新启用？

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

invoke 方法仅“根据需要”运行，这基本上意味着一旦运行一次，除非重新启用，否则不会再次运行。

您可以在每次 .invoke 之后调用 .reenable 来重置它，或者使用 .execute 命令来运行任务。

.execute 的警告是，如果您有它们，它不会运行任务的依赖项。

Why is Rake not able to invoke multiple tasks consecutively?

How to run Rake tasks from within Rake tasks?