无法使用 gem 因为 json 2.1.0 已激活，但 gem 需要 1.8.6

Question

我一直在努力弄清楚如何让 slack-ruby-client gem 在我的 Ruby 脚本中工作，但是当涉及到 json，显然。

这是我得到的：

[user:ubuntu:~/Documents]$ irb                                                                                                                  4:43PM/07.08
2.5.1 :001 > require 'slack-ruby-client'
Traceback (most recent call last):
       11: from /home/user/.rvm/rubies/ruby-2.5.1/bin/irb:11:in `<main>'
       10: from (irb):1
        9: from /home/user/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:39:in `require'
        8: from /home/user/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:135:in `rescue in require'
        7: from /home/user/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:135:in `require'
        6: from /home/user/.rvm/gems/ruby-2.5.1/gems/slack-ruby-client-0.11.1/lib/slack-ruby-client.rb:13:in `<top (required)>'
        5: from /home/user/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:90:in `require'
        4: from /home/user/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:90:in `each'
        3: from /home/user/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:91:in `block in require'
        2: from /home/user/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/rubygems/specification.rb:1434:in `activate'
        1: from /home/user/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/rubygems/specification.rb:2315:in `check_version_conflict'
Gem::LoadError (can't activate json-1.8.6, already activated json-2.1.0)
2.5.1 :002 > exit

我无法卸载 json v2.1.0 无论出于何种原因。虽然在运行gem uninstall json v2.1.0的时候说卸载成功了，但是在gem的列表里搜索json.

的时候还是出现了

[user:ubuntu:~/Documents]$ gem uninstall json -v 2.1.0                                                                                          4:45PM/07.08
Successfully uninstalled json-2.1.0
[user:ubuntu:~/Documents]$ gem list | grep -i json                                                                                              4:47PM/07.08
json (default: 2.1.0, 1.8.6)
multi_json (1.13.1, 1.11.2)

然后错误仍然存在。我尝试手动安装 1.8.6 以查看它是否会覆盖默认值，但没有。

如有任何建议，我们将不胜感激。

尝试 #1

[user:~/Documents]$ gem uninstall json                                                                                                   2:52PM/07.09

You have requested to uninstall the gem:
        json-1.8.6

activesupport-4.2.4 depends on json (>= 1.7.7, ~> 1.7)
activesupport-4.2.3 depends on json (>= 1.7.7, ~> 1.7)
rdoc-4.2.0 depends on json (~> 1.4)
sdoc-0.4.2 depends on json (>= 1.7.7, ~> 1.7)
sdoc-0.4.1 depends on json (>= 1.7.7, ~> 1.7)
If you remove this gem, these dependencies will not be met.
Continue with Uninstall? [yN]  y
Successfully uninstalled json-1.8.6

[user:ubuntu:~/Documents/rubyscript]$ bundle install                                                                                             2:56PM/07.09
Fetching gem metadata from https://rubygems.org/.
Resolving dependencies...
Using bundler 1.16.2
Fetching json 1.8.6
Installing json 1.8.6 with native extensions
Bundle complete! 1 Gemfile dependency, 2 gems now installed.
Use `bundle info [gemname]` to see where a bundled gem is installed.
[user:ubuntu:~/Documents/rubyscript]$ irb                                                                                                        2:56PM/07.09
2.5.1 :001 > require 'slack-ruby-client'
Traceback (most recent call last):
       11: from /home/user/.rvm/rubies/ruby-2.5.1/bin/irb:11:in `<main>'
       10: from (irb):1
        9: from /home/user/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:39:in `require'
        8: from /home/user/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:135:in `rescue in require'
        7: from /home/user/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:135:in `require'
        6: from /home/user/.rvm/gems/ruby-2.5.1/gems/slack-ruby-client-0.11.1/lib/slack-ruby-client.rb:13:in `<top (required)>'
        5: from /home/user/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:90:in `require'
        4: from /home/user/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:90:in `each'
        3: from /home/user/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:91:in `block in require'
        2: from /home/user/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/rubygems/specification.rb:1434:in `activate'
        1: from /home/user/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/rubygems/specification.rb:2315:in `check_version_conflict'
Gem::LoadError (can't activate json-1.8.6, already activated json-2.1.0)
2.5.1 :002 > exit
[user:ubuntu:~/Documents/rubyscript]$ cat Gemfile                                                                                                2:56PM/07.09
source 'https://rubygems.org'

gem 'json', '=1.8.6'

Answer 1

首先，尝试卸载所有版本的 gem：

gem uninstall json

然后安装所需的特定版本，还要确保您的 Gemfile 指定特定版本 gem:

gem 'json', '=1.8.6'

这应该可以解决问题

Answer 2

请尝试

bundle exec rspec

或

bundle exec rake spec

希望对您有所帮助！

Answer 3

bundle exec rspec 为我解决了...在我的情况下，我试图在 docker 容器中运行 rspec。 Ruby2.6

无法使用 gem 因为 json 2.1.0 已激活，但 gem 需要 1.8.6

Can't use a gem because json 2.1.0 is activated, but the gem requires 1.8.6

ruby

json

rubygems

slack