NoMethodError试图使用Ruby RestClient

我正在尝试使用RestClient与API对话，我得到了以下错误和回溯：

>> RestClient.post "http://localhost:8081/accounts", {}.to_json, content_type: :json, accept: :json
NoMethodError: undefined method `[]' for #<Set: {#<MIME::Type: application/json>}>
    from /Users/pupeno/.rvm/gems/ruby-2.3.1@console/gems/rest-client-1.6.7/lib/restclient/request.rb:307:in `type_for_extension'
    from /Users/pupeno/.rvm/gems/ruby-2.3.1@console/gems/rest-client-1.6.7/lib/restclient/request.rb:312:in `type_for_extension'
    from /Users/pupeno/.rvm/gems/ruby-2.3.1@console/gems/rest-client-1.6.7/lib/restclient/request.rb:278:in `block in stringify_headers'
    from /Users/pupeno/.rvm/gems/ruby-2.3.1@console/gems/rest-client-1.6.7/lib/restclient/request.rb:272:in `each'
    from /Users/pupeno/.rvm/gems/ruby-2.3.1@console/gems/rest-client-1.6.7/lib/restclient/request.rb:272:in `inject'
    from /Users/pupeno/.rvm/gems/ruby-2.3.1@console/gems/rest-client-1.6.7/lib/restclient/request.rb:272:in `stringify_headers'
    from /Users/pupeno/.rvm/gems/ruby-2.3.1@console/gems/rest-client-1.6.7/lib/restclient/request.rb:92:in `make_headers'
    from /Users/pupeno/.rvm/gems/ruby-2.3.1@console/gems/rest-client-1.6.7/lib/restclient/request.rb:58:in `initialize'
    from /Users/pupeno/.rvm/gems/ruby-2.3.1@console/gems/rest-client-1.6.7/lib/restclient/request.rb:33:in `new'
    from /Users/pupeno/.rvm/gems/ruby-2.3.1@console/gems/rest-client-1.6.7/lib/restclient/request.rb:33:in `execute'
    from /Users/pupeno/.rvm/gems/ruby-2.3.1@console/gems/rest-client-1.6.7/lib/restclient.rb:72:in `post'
    from (irb):5
    from /Users/pupeno/.rvm/gems/ruby-2.3.1@console/gems/railties-4.2.6/lib/rails/commands/console.rb:110:in `start'
    from /Users/pupeno/.rvm/gems/ruby-2.3.1@console/gems/railties-4.2.6/lib/rails/commands/console.rb:9:in `start'
    from /Users/pupeno/.rvm/gems/ruby-2.3.1@console/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:68:in `console'
    from /Users/pupeno/.rvm/gems/ruby-2.3.1@console/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
    from /Users/pupeno/.rvm/gems/ruby-2.3.1@console/gems/railties-4.2.6/lib/rails/commands.rb:17:in `<top (required)>'
    from /Users/pupeno/Documents/qredo/console/bin/rails:9:in `require'
    from /Users/pupeno/Documents/qredo/console/bin/rails:9:in `<top (required)>'
    from -e:1:in `load'
    from -e:1:in `<main>'

>RestClient.post”http://localhost:8081/accounts“，{}.to_json，content_type:：json，accept:：json
NoMethodError:的未定义方法“[]”#
来自/Users/pupeno/.rvm/gems/ruby-2.3。1@console/gems/rest-client-1.6.7/lib/restclient/request.rb:307:in'type_for_extension'
来自/Users/pupeno/.rvm/gems/ruby-2.3。1@console/gems/rest-client-1.6.7/lib/restclient/request.rb:312:in'type_for_extension'
来自/Users/pupeno/.rvm/gems/ruby-2.3。1@console/gems/rest-client-1.6.7/lib/restclient/request.rb:278:in'block in stringify_headers'
来自/Users/pupeno/.rvm/gems/ruby-2.3。1@console/gems/rest-client-1.6.7/lib/restclient/request.rb:272:in'each'
来自/Users/pupeno/.rvm/gems/ruby-2.3。1@console/gems/rest-client-1.6.7/lib/restclient/request.rb:272:in'inject'
来自/Users/pupeno/.rvm/gems/ruby-2.3。1@console/gems/rest-client-1.6.7/lib/restclient/request.rb:272:in'stringify_headers'
来自/Users/pupeno/.rvm/gems/ruby-2.3。1@console/gems/rest-client-1.6.7/lib/restclient/request.rb:92:in'make_headers'
来自/Users/pupeno/.rvm/gems/ruby-2.3。1@console/gems/rest-client-1.6.7/lib/restclient/request.rb:58:in'initialize'
来自/Users/pupeno/.rvm/gems/ruby-2.3。1@console/gems/rest-client-1.6.7/lib/restclient/request.rb:33:in'new'
来自/Users/pupeno/.rvm/gems/ruby-2.3。1@console/gems/rest-client-1.6.7/lib/restclient/request.rb:33:in'execute'
来自/Users/pupeno/.rvm/gems/ruby-2.3。1@console/gems/rest-client-1.6.7/lib/restclient.rb:72:in'post'
来自（irb）：5
来自/Users/pupeno/.rvm/gems/ruby-2.3。1@console/gems/railties-4.2.6/lib/rails/commands/console.rb:110:in'start'
来自/Users/pupeno/.rvm/gems/ruby-2.3。1@console/gems/railties-4.2.6/lib/rails/commands/console.rb:9:in'start'
来自/Users/pupeno/.rvm/gems/ruby-2.3。1@console/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:68:in'console'
来自/Users/pupeno/.rvm/gems/ruby-2.3。1@console/gems/railties-4.2.6/lib/rails/commands/commands\u tasks.rb:39:in'run\u command！'
来自/Users/pupeno/.rvm/gems/ruby-2.3。1@console/gems/railties-4.2.6/lib/rails/commands.rb:17:in`'
from/Users/pupeno/Documents/qredo/console/bin/rails:9:in'require'
from/Users/pupeno/Documents/qredo/console/bin/rails:9:in`'
from-e:1:in“load”
from-e:1:in`'

---

知道这里出了什么问题吗？据我所知，请求可能没有到达服务器，但我的线路如下。

我会检查您的RestClient版本安装了哪个版本的

mime类型。看起来两个版本可能不兼容。快速挖掘RestClient源代码，您的stacktrace就发生在这里：


与安装的mime类型版本类似，
@extension\u index
指的是没有
[]
实例方法的集合。mime类型gem有点难理解，但我认为集合正在
/lib/mime/types/container.rb
（）中初始化

所以，在这一点上，这意味着你有两个选择。将mime类型gem固定到gem文件中的旧版本，或者升级RestClient。看起来RestClient版本删除了导致此问题的monkey补丁。
我刚刚将此gem添加到我的一个项目中。你能展示你的代码并确认api返回了什么吗？我认为空哈希{}有问题。要想获得json，请尝试在其中传递一些值，比如{'x'=>1}。要获得json。猜猜看。你能更新到更高版本的RestClient gem吗？Hola Pablo，你能更新到最新版本吗？你能试试铁轨外面吗？我尝试过最新的gem，它很有效，即使是空的{}。简化者的欢呼