ruby - Rails 3 runner 没有检测到 JSON gem？

Question

我正在尝试创建Ruby脚本以在我的Rails 3环境中运行。

但是，每当我使用Rails Runner运行此 ruby​​script 时，都会收到此错误：

require 'rubygems'
require 'json'

@payload = {
"message" => "helloworld",
"station" => {"id"=>12345}
}.to_json

puts @payload

错误：

/usr/lib/ruby/gems/1.8/gems/activesupport-3.0.0.beta4/lib/active_support/dependencies.rb:212:in `require': no such file to load -- json (LoadError)
 from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.0.beta4/lib/active_support/dependencies.rb:212:in `require'
 from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.0.beta4/lib/active_support/dependencies.rb:198:in `load_dependency'
 from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.0.beta4/lib/active_support/dependencies.rb:554:in `new_constants_in'
 from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.0.beta4/lib/active_support/dependencies.rb:198:in `load_dependency'
 from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.0.beta4/lib/active_support/dependencies.rb:212:in `require'
 from createflags.rb:2
 from /usr/lib/ruby/gems/1.8/gems/railties-3.0.0.beta4/lib/rails/commands.rb:39:in `eval'
 from /usr/lib/ruby/gems/1.8/gems/railties-3.0.0.beta4/lib/rails/commands/runner.rb:47
 from /usr/lib/ruby/gems/1.8/gems/railties-3.0.0.beta4/lib/rails/commands.rb:39:in `require'
 from /usr/lib/ruby/gems/1.8/gems/railties-3.0.0.beta4/lib/rails/commands.rb:39
 from script/rails:6:in `require'
 from script/rails:6

有人可以告诉我我能做些什么来解决这个问题吗？

Answer 1

我并不完全熟悉 Bundler 的内部结构，但可能是它不允许require在 Gemfile 中使用其他 gem。也许添加gem 'json'会解决这个问题。

当然，ActiveSupport 有它自己的 JSON 模块，所以应该没有必要引入另一个 gem。

Answer 2

删除需要“json”，然后尝试。我相信 ActiveSupport 已经内置了 to_json。