相关疑难解决方法(0)

file1 需要file2,我希望能够file2在某些条件下取消评估而不退出整个过程.

# file1.rb
  puts "In file 1"
  require 'file2'
  puts "Back in file 1"

# file2.rb
  puts "In file 2"
  # return if some_conditional
  puts "Still in file 2"

运行时file1,我想看到的输出是:

In file 1
In file 2
Back in file 1

目标是Still in file 2永不打印,同时Back in file 1打印.我能做些什么才能做到file2这一点？

我无法使用exit/ exit!/ abort这里,因为Back in file 1永远不会打印.我可以使用raise/ fail,但为了做到这一点,我将不得不改变file1和rescue …

如果找不到库（通过 require 加载），我可以有条件地跳过在同一文件中加载“更多”ruby 代码吗？

begin
  require 'aws-sdk'
rescue LoadError
  puts "aws-sdk gem not found"
  return #does not work. nor does next
end

# code after here should not be executed as `aws-sdk` gem was not found
puts "=== should not get executed"

namespace :db do
  desc "import local postgres database to heroku. user and database name is hardcoded"
  task :import_to_heroku => [:environment, "db:dump_for_heroku"] do
    # code using aws-sdk gem
  end
end

在上面的代码中，我可以要求 Ruby 在点击 rescue LoadError.

类似于提前返回，但用于加载文件而不是函数。

需要它，因为我有一个需要aws-sdk …