In a discussion about requiring external gems in Discourse plugins, users explore how to include gems not in Discourse’s default Gemfile. kgish initiates the thread seeking guidance, and Falco points to an example plugin using plugin.rb to declare gems and their dependencies. kgish follows up asking about rake tasks, and zogstrip suggests using LOAD_PLUGINS=1 rake your:rake:task. Later, fzngagan shares a crash log while trying to use the oxford_dictionary gem, revealing dependency issues. merefield explains that all transitive dependencies must be manually declared in plugin.rb, calling it a “lengthy iterative process,” which Falco humorously renames a “lengthy recursive process.” fzngagan adds that require: false doesn’t work — the gem must be explicitly required. Luke_Clancy shares a practical workflow: use Ruby 2.6.5 locally, create a Gemfile, run bundle install, and copy dependencies into plugin.rb. Finally, JDoy99 reports a similar issue with the eth gem failing due to a missing forwardable dependency, despite manually installing the gem — highlighting that Discourse’s plugin gem loader doesn’t auto-resolve dependencies, requiring explicit declaration of all nested dependencies in plugin.rb.
For a plugin that I am writing, I would like to use some external gem files that are not present in the default discourse gemfile.
What is the standard way of doing this without being able to modify the discourse gemfile?
Also a similar question reqarding user-defined rake tasks.
Keep in mind you have to declare the gems AND dependencies.
Thanks, didn’t realize that all dependencies needed to be included as well.
How can I also do this for rake tasks?
Have you tried “LOAD_PLUGINS=1 rake your:rake:task”?
我正在尝试使用一个名为 oxford_dictionary 的 Ruby gem。
gem 'oxford_dictionary', '2.0.1', { require: false }
我在控制台中得到了以下输出：
/bin/bash -c "env RBENV_VERSION=2.6.2 /usr/local/Cellar/rbenv/1.1.2/libexec/rbenv exec ruby /Users/faiz/discenv/discourse/bin/rails server -b 0.0.0.0 -p 3000 -e development"
I, [2019-08-08T14:01:24.177008 #5867] INFO -- : Refreshing Gem list
Traceback (most recent call last):
30: from /Users/faiz/discenv/discourse/bin/unicorn:49:in `<main>'
29: from /Users/faiz/discenv/discourse/bin/unicorn:49:in `load'
28: from /Users/faiz/.rbenv/versions/2.6.2/lib/ruby/gems/2.6.0/gems/unicorn-5.5.1/bin/unicorn:128:in `<top (required)>'
27: from /Users/faiz/.rbenv/versions/2.6.2/lib/ruby/gems/2.6.0/gems/unicorn-5.5.1/lib/unicorn/http_server.rb:141:in `start'
26: from /Users/faiz/.rbenv/versions/2.6.2/lib/ruby/gems/2.6.0/gems/unicorn-5.5.1/lib/unicorn/http_server.rb:794:in `build_app!'
25: from /Users/faiz/.rbenv/versions/2.6.2/lib/ruby/gems/2.6.0/gems/unicorn-5.5.1/lib/unicorn.rb:54:in `block in builder'
24: from /Users/faiz/.rbenv/versions/2.6.2/lib/ruby/gems/2.6.0/gems/unicorn-5.5.1/lib/unicorn.rb:54:in `eval'
23: from config.ru:1:in `<main>'
22: from config.ru:1:in `new'
21: from /Users/faiz/.rbenv/versions/2.6.2/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:55:in `initialize'
20: from /Users/faiz/.rbenv/versions/2.6.2/lib/ruby/gems/2.6.0/gems/rack-2.0.7/lib/rack/builder.rb:55:in `instance_eval'
19: from config.ru:7:in `block in <main>'
18: from config.ru:7:in `require'
17: from /Users/faiz/discenv/discourse/config/environment.rb:4:in `<top (required)>'
16: from /Users/faiz/discenv/discourse/config/environment.rb:4:in `require'
15: from /Users/faiz/discenv/discourse/config/application.rb:57:in `<top (required)>'
14: from /Users/faiz/discenv/discourse/config/application.rb:58:in `<module:Discourse>'
13: from /Users/faiz/discenv/discourse/config/application.rb:261:in `<class:Application>'
12: from lib/discourse.rb:168:in `activate_plugins!'
11: from lib/discourse.rb:168:in `each'
10: from lib/discourse.rb:171:in `block in activate_plugins!'
9: from /Users/faiz/discenv/discourse/lib/plugin/instance.rb:486:in `activate!'
8: from /Users/faiz/discenv/discourse/lib/plugin/instance.rb:486:in `instance_eval'
7: from /Users/faiz/discenv/discourse/plugins/discourse-dictionary/plugin.rb:7:in `activate!'
6: from /Users/faiz/discenv/discourse/lib/plugin/instance.rb:560:in `gem'
5: from /Users/faiz/discenv/discourse/lib/plugin_gem.rb:20:in `load'
4: from /Users/faiz/.rbenv/versions/2.6.2/lib/ruby/2.6.0/rubygems/specification.rb:1420:in `activate'
3: from /Users/faiz/.rbenv/versions/2.6.2/lib/ruby/2.6.0/rubygems/specification.rb:1438:in `activate_dependencies'
2: from /Users/faiz/.rbenv/versions/2.6.2/lib/ruby/2.6.0/rubygems/specification.rb:1438:in `each'
1: from /Users/faiz/.rbenv/versions/2.6.2/lib/ruby/2.6.0/rubygems/specification.rb:1449:in `block in activate_dependencies'
/Users/faiz/.rbenv/versions/2.6.2/lib/ruby/2.6.0/rubygems/dependency.rb:311:in `to_specs': Could not find 'plissken' (~> 0.1.0) among 285 total gem(s) (Gem::MissingSpecError)
Checked in 'GEM_PATH=/Users/faiz/.rbenv/versions/2.6.2/lib/ruby/gems/2.6.0:/Users/faiz/.gem/ruby/2.6.0', execute `gem env` for more information
Process finished with exit code 1
我认为这可能是因为 Discourse 无法安装该 gem 本身所需的依赖项。我该如何修复？
更新
好的，我已经解决了。名为 plissken 的依赖项需要单独声明。
但为什么会这样呢？
您的目标 gem 依赖未被包含在主 Gemfile 中，因此需要在 plugin.rb 中添加该依赖。
这个过程有时可能需要多次迭代，耗时较长！
我会说这是一个漫长的递归过程 
另外，我无法在那里使用 require: false。我必须将其设置为 true 并显式引入它才能使其生效。
希望有一天递归能由计算机来处理 
根据我自己的经验，更新如下：
我不确定 ‘required’ 具体起什么作用，但我将其设置为 true。
您好，我知道这已经过去一段时间了，但我在尝试安装 eth gem 时遇到了一个依赖项错误：
I, [2023-08-28T15:00:23.737246 #1] INFO -- : cd /var/www/discourse & su discourse -c 'bundle exec rake db:migrate'
rake aborted!
Gem::MissingSpecError: Could not find 'forwardable' (>= 1.3) among 231 total gem(s)
Checked in 'GEM_PATH=/var/www/discourse/vendor/bundle/ruby/3.2.0:/var/www/discourse/plugins/discourse-radiant-member/gems/3.2.2' at: /var/www/discourse/plugins/discourse-radiant-member/gems/3.2.2/specifications/eth-0.5.11.gemspec, execute `gem env` for more information
/var/www/discourse/lib/plugin_gem.rb:25:in `load'
/var/www/discourse/lib/plugin/instance.rb:825:in `gem'
/var/www/discourse/plugins/discourse-radiant-member/plugin.rb:10:in `activate!'
/var/www/discourse/lib/plugin/instance.rb:722:in `instance_eval'
/var/www/discourse/lib/plugin/instance.rb:722:in `activate!'
/var/www/discourse/lib/discourse.rb:346:in `block in activate_plugins!'
/var/www/discourse/lib/discourse.rb:343:in `each'
/var/www/discourse/lib/discourse.rb:343:in `activate_plugins!'
/var/www/discourse/config/application.rb:218:in `block in <class:Application>'
/var/www/discourse/lib/plugin.rb:6:in `initialization_guard'
/var/www/discourse/config/application.rb:218:in `<class:Application>'
/var/www/discourse/config/application.rb:75:in `<module:Discourse>'
/var/www/discourse/config/application.rb:74:in `<top (required)>'
internal:/usr/local/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb:37:in `require'
internal:/usr/local/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb:37:in `require'
/var/www/discourse/Rakefile:7:in `<top (required)>'
/var/www/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.0.6/exe/rake:27:in `<top (required)>'
/usr/local/bin/bundle:25:in `load'
/usr/local/bin/bundle:25:in `<main>'
Caused by:
Gem::MissingSpecError: Could not find 'forwardable' (>= 1.3) among 231 total gem(s)
Checked in 'GEM_PATH=/var/www/discourse/vendor/bundle/ruby/3.2.0:/var/www/discourse/plugins/discourse-radiant-member/gems/3.2.2' , execute `gem env` for more information
/var/www/discourse/lib/plugin_gem.rb:25:in `load'
/var/www/discourse/lib/plugin/instance.rb:825:in `gem'
/var/www/discourse/plugins/discourse-radiant-member/plugin.rb:10:in `activate!'
/var/www/discourse/lib/plugin/instance.rb:722:in `instance_eval'
/var/www/discourse/lib/plugin/instance.rb:722:in `activate!'
/var/www/discourse/lib/discourse.rb:346:in `block in activate_plugins!'
/var/www/discourse/lib/discourse.rb:343:in `each'
/var/www/discourse/lib/discourse.rb:343:in `activate_plugins!'
/var/www/discourse/config/application.rb:218:in `block in <class:Application>'
/var/www/discourse/lib/plugin.rb:6:in `initialization_guard'
/var/www/discourse/config/application.rb:218:in `<class:Application>'
/var/www/discourse/config/application.rb:75:in `<module:Discourse>'
/var/www/discourse/config/application.rb:74:in `<top (required)>'
internal:/usr/local/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb:37:in `require'
internal:/usr/local/lib/ruby/site_ruby/3.2.0/rubygems/core_ext/kernel_require.rb:37:in `require'
/var/www/discourse/Rakefile:7:in `<top (required)>'
/var/www/discourse/vendor/bundle/ruby/3.2.0/gems/rake-13.0.6/exe/rake:27:in `<top (required)>'
/usr/local/bin/bundle:25:in `load'
/usr/local/bin/bundle:25:in `<main>'
(See full trace by running task with --trace)
I, [2023-08-28T15:00:26.013232 #1] INFO -- : gem install eth -v 0.5.11 -i /var/www/discourse/plugins/discourse-radiant-member/gems/3.2.2 --no-document --ignore-dependencies --no-user-install
Successfully installed eth-0.5.11
1 gem installed
I, [2023-08-28T15:00:26.014015 #1] INFO -- : Terminating async processes
I, [2023-08-28T15:00:26.014342 #1] INFO -- : Sending INT to HOME=/var/lib/postgresql USER=postgres exec chpst -u postgres:postgres:ssl-cert -U postgres:postgres:ssl-cert /usr/lib/postgresql/13/bin/postmaster -D /etc/postgresql/13/main pid: 42
I, [2023-08-28T15:00:26.014700 #1] INFO -- : Sending TERM to exec chpst -u redis -U redis /usr/bin/redis-server /etc/redis/redis.conf pid: 111
2023-08-28 15:00:26.015 UTC [42] LOG: received fast shutdown request
111:signal-handler (1693234826) Received SIGTERM scheduling shutdown...
2023-08-28 15:00:26.027 UTC [42] LOG: aborting any active transactions
111:M 28 Aug 2023 15:00:26.030 # User requested shutdown...
111:M 28 Aug 2023 15:00:26.031 * Saving the final RDB snapshot before exiting.
2023-08-28 15:00:26.034 UTC [42] LOG: background worker "logical replication launcher" (PID 51) exited with exit code 1
2023-08-28 15:00:26.035 UTC [46] LOG: shutting down
111:M 28 Aug 2023 15:00:26.074 * DB saved on disk
111:M 28 Aug 2023 15:00:26.074 # Redis is now ready to exit, bye bye...
2023-08-28 15:00:26.087 UTC [42] LOG: database system is shut down
FAILED
--------------------
Pups::ExecError: cd /var/www/discourse & su discourse -c 'bundle exec rake db:migrate' failed with return #<Process::Status: pid 1002 exit 1>
Location of failure: /usr/local/lib/ruby/gems/3.2.0/gems/pups-1.1.1/lib/pups/exec_command.rb:117:in `spawn'
exec failed with the params {"cd"=>"$home", "hook"=>"db_migrate", "cmd"=>["su discourse -c 'bundle exec rake db:migrate'"]}
bootstrap failed with exit code 1
** FAILED TO BOOTSTRAP ** please scroll up and look for earlier error messages, there may be more than one.
./discourse-doctor may help diagnose the problem.
32dfbed48cf5bbb8f9a2d25b0d75388e296cd78ce7f56d37fb7a59c543888ad1
我的仓库在这里 - GitHub - JD0x2e/discourse-radiant-member: Get member status and update group membership
我已经要求了 forwardable 依赖项，以及其他一些以防万一（这些是我从 Gemfile.lock 中获得的），但我的应用程序在抛出此错误时无法重新构建，有什么想法吗？