Question

我刚用rvm设置了一个用于rails开发的Linux Mint盒子。我继续生成了一个Rails 5应用程序，设置了mysql连接，添加了cucumber-rails gem然后尝试运行：

rake cucumber

出于某种原因，我遇到了：

/usr/bin/ruby2.3 -S bundle exec cucumber --profile default
/usr/lib/ruby/vendor_ruby/json/version.rb:3: warning: already initialized constant JSON::VERSION
/var/lib/gems/2.3.0/gems/json-1.8.5/lib/json/version.rb:3: warning: previous definition of VERSION was here
/usr/lib/ruby/vendor_ruby/json/version.rb:4: warning: already initialized constant JSON::VERSION_ARRAY
/var/lib/gems/2.3.0/gems/json-1.8.5/lib/json/version.rb:4: warning: previous definition of VERSION_ARRAY was here
/usr/lib/ruby/vendor_ruby/json/version.rb:5: warning: already initialized constant JSON::VERSION_MAJOR
/var/lib/gems/2.3.0/gems/json-1.8.5/lib/json/version.rb:5: warning: previous definition of VERSION_MAJOR was here
/usr/lib/ruby/vendor_ruby/json/version.rb:6: warning: already initialized constant JSON::VERSION_MINOR
/var/lib/gems/2.3.0/gems/json-1.8.5/lib/json/version.rb:6: warning: previous definition of VERSION_MINOR was here
/usr/lib/ruby/vendor_ruby/json/version.rb:7: warning: already initialized constant JSON::VERSION_BUILD
/var/lib/gems/2.3.0/gems/json-1.8.5/lib/json/version.rb:7: warning: previous definition of VERSION_BUILD was here
/usr/lib/ruby/vendor_ruby/json/common.rb:99: warning: already initialized constant JSON::NaN
/var/lib/gems/2.3.0/gems/json-1.8.5/lib/json/common.rb:99: warning: previous definition of NaN was here
/usr/lib/ruby/vendor_ruby/json/common.rb:101: warning: already initialized constant JSON::Infinity
/var/lib/gems/2.3.0/gems/json-1.8.5/lib/json/common.rb:101: warning: previous definition of Infinity was here
/usr/lib/ruby/vendor_ruby/json/common.rb:103: warning: already initialized constant JSON::MinusInfinity
/var/lib/gems/2.3.0/gems/json-1.8.5/lib/json/common.rb:103: warning: previous definition of MinusInfinity was here
/usr/lib/ruby/vendor_ruby/json/common.rb:128: warning: already initialized constant JSON::UnparserError
/var/lib/gems/2.3.0/gems/json-1.8.5/lib/json/common.rb:128: warning: previous definition of UnparserError was here

据我所知，这是一个相当普通的香草装置，所以我无法理解我为获得这些警告而做了些什么。我在某种程度上有相互矛盾的宝石吗？如果是这样，我该如何解决这个问题？

Answer 1

我设法通过以下方式摆脱了JSON警告：

bundle clean --force
bundle

Answer 2

redshift5's answer 为我工作。只是为了添加更多上下文。

我在使用 Rails 6 处理应用程序时遇到了同样的问题。

我收到了这样的警告：

/home/promisechukwuenyem/.rbenv/versions/2.7.2/lib/ruby/2.7.0/json/version.rb:4: warning: already initialized constant JSON::VERSION
/home/promisechukwuenyem/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/json-2.5.1/lib/json/version.rb:4: warning: previous definition of VERSION was here
/home/promisechukwuenyem/.rbenv/versions/2.7.2/lib/ruby/2.7.0/json/version.rb:5: warning: already initialized constant JSON::VERSION_ARRAY
/home/promisechukwuenyem/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/json-2.5.1/lib/json/version.rb:5: warning: previous definition of VERSION_ARRAY was here
/home/promisechukwuenyem/.rbenv/versions/2.7.2/lib/ruby/2.7.0/json/version.rb:6: warning: already initialized constant JSON::VERSION_MAJOR
/home/promisechukwuenyem/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/json-2.5.1/lib/json/version.rb:6: warning: previous definition of VERSION_MAJOR was here
/home/promisechukwuenyem/.rbenv/versions/2.7.2/lib/ruby/2.7.0/json/version.rb:7: warning: already initialized constant JSON::VERSION_MINOR
/home/promisechukwuenyem/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/json-2.5.1/lib/json/version.rb:7: warning: previous definition of VERSION_MINOR was here
/home/promisechukwuenyem/.rbenv/versions/2.7.2/lib/ruby/2.7.0/json/version.rb:8: warning: already initialized constant JSON::VERSION_BUILD
/home/promisechukwuenyem/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/json-2.5.1/lib/json/version.rb:8: warning: previous definition of VERSION_BUILD was here
/home/promisechukwuenyem/.rbenv/versions/2.7.2/lib/ruby/2.7.0/json/common.rb:100: warning: already initialized constant JSON::NaN
/home/promisechukwuenyem/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/json-2.5.1/lib/json/common.rb:130: warning: previous definition of NaN was here
/home/promisechukwuenyem/.rbenv/versions/2.7.2/lib/ruby/2.7.0/json/common.rb:102: warning: already initialized constant JSON::Infinity
/home/promisechukwuenyem/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/json-2.5.1/lib/json/common.rb:132: warning: previous definition of Infinity was here
/home/promisechukwuenyem/.rbenv/versions/2.7.2/lib/ruby/2.7.0/json/common.rb:104: warning: already initialized constant JSON::MinusInfinity
/home/promisechukwuenyem/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/json-2.5.1/lib/json/common.rb:134: warning: previous definition of MinusInfinity was here
/home/promisechukwuenyem/.rbenv/versions/2.7.2/lib/ruby/2.7.0/json/common.rb:129: warning: already initialized constant JSON::UnparserError

我尝试过的事情：

我尝试删除我的 Gemfile.lock 文件并尝试重新创建 bundle install，但没有解决。
我尝试从我的计算机上卸载 puma 和 jsonapi-serializer 的所有 gem 版本并重新安装它们，但这并没有解决问题。

这是我修复的方法：

首先，即使设置了 --path，我还是运行以下命令强制清理 bundler 目录中未使用的 gem：

bundle clean --force

接下来，我运行以下命令为项目重新安装我的 gem：

bundle install

或

bundle update

或

bundle update --force

仅此而已。

我希望这会有所帮助。

Answer 3

你的Ruby版本附带的json gem有点过时了。如果你想摆脱这些警告，你必须在你的Gemfile中包含它的更新版本：

gem 'json', '>= 2.0.0'

然后运行bundle install。

为什么我得到＆＃34;警告：已经初始化了常量JSON :: VERSION＆＃34;什么时候运行耙黄瓜？

3 个答案: