在capistrano任务中使用子字符串

Question

我对卡利斯特拉诺很新。我想知道如何在capistrano任务中对变量进行子串。

虽然这给了我在 irb

中的期望

ruby-1.9.2-p136 :012 > release_path = "12345678910"
 => "12345678910"
ruby-1.9.2-p136 :019 > release_path[-6..-1]
 => "678910"

在capistrano任务中 什么都不做

namespace :namespacename do
  task :taskname do

    release_path = "1234678910"
    release_path[-6..-1]

    # output is still "12345678910"
    puts release_path

  end
end

任何人如何在capistrano任务中对变量使用ruby类/方法？提前谢谢。

Answer 1

这都是卡皮斯特拉诺的红宝石，所以一切都真的如此：

namespace :namespacename do
  task :taskname do

    release_path = "1234678910"
    release_path[-6..-1]     #<----    NO!!!

    # output is "678910"
    puts release_path[-6..-1]      #<----    YEAH BOY!!!

    release_path = release_path[-6..-1]
    puts release_path       # output is "678910"

    release_path[-3..-1]   # does nothing because "910" is returned into thin air
    puts release_path[-3..-1]       # output is "910"
    puts release_path[-3..-1][-2..-1]    # output is substring of substring "10"
  end
end

使用子字符串范围语法[x ... y]它将返回它，而不是截断它并存储在同一个变量中。

HTH