如何跳过红宝石需求？ [英] How to skip require in ruby?

问题描述

我可以有条件跳过在Ruby中需要文件吗？

Can I conditionally skip requiring a file in Ruby?

begin
  require 'aws-sdk'
rescue LoadError
  puts "aws-sdk gem not found"
end

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，我可以让Ruby不要在 rescue rescue LoadError

之后阅读。整个代码在一个条件，但不雅。
我试过下一步和 return 。

In the above code, can I ask Ruby not to read after rescue LoadError
I can wrap the whole code in an conditional but that is inelegant. I tried next and return.

编辑：在添加一个新问题我是否可以有条件地跳过加载进一步 ruby代码在同一个文件？。抱歉。没有正确提出这个问题

added a new question at Can I conditionally skip loading "further" ruby code in the same file?. sorry. Did not ask this question properly

推荐答案

我已经救出了LoadError，但是我希望如果LoadError被执行。，进一步的代码不应该被执行。在给出的示例中，不应该调用rake任务db：import_to_heroku

i have rescued LoadError but i want that if LoadError is executed., further code should not be executed. In the example given, the rake task db:import_to_heroku should not be called

然后执行：

Then do:

begin
  require 'aws-sdk'

  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
rescue LoadError
  puts "aws-sdk gem not found"
end

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