使用RVM升級到Ruby 2.1.2後Paper Trail（paper_trail）錯誤。未初始化的常量PaperTrail :: Rails :: Engine

Question

我試圖從Ruby 1.9.3 to Ruby 2.1.2 (Rails 4.0)升級。我正在使用RVM。

我安裝了Ruby 2.1.2，更新了Gemfile，包括指定"gem 'paper_trail', '~> 3.0.5'"，用RVM切換到Ruby 2.1.2，創建了一個新的gemset，並切換到它。

然後我做了一個軟件包安裝。

When I attempt to run rails server, I get the following error:

/Users/sjohnson/my_app/config/initializers/paper_trail.rb:2:in <top (required)>': uninitialized constant PaperTrail::Rails::Engine (NameError) from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/zeus-0.13.3/lib/zeus/load_tracking.rb:50:in load' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/zeus-0.13.3/lib/zeus/load_tracking.rb:50:in load' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/zeus-0.13.3/lib/zeus/load_tracking.rb:43:in load' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/railties-4.0.5/lib/rails/engine.rb:609:in block (2 levels) in <class:Engine>' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/railties-4.0.5/lib/rails/engine.rb:608:in each' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/railties-4.0.5/lib/rails/engine.rb:608:in block in <class:Engine>' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/railties-4.0.5/lib/rails/initializable.rb:30:in instance_exec' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/railties-4.0.5/lib/rails/initializable.rb:30:in run' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/railties-4.0.5/lib/rails/initializable.rb:55:in block in run_initializers' from /Users/sjohnson/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:226:in block in tsort_each' from /Users/sjohnson/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:348:in block (2 levels) in each_strongly_connected_component' from /Users/sjohnson/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:418:in block (2 levels) in each_strongly_connected_component_from' from /Users/sjohnson/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:427:in each_strongly_connected_component_from' from /Users/sjohnson/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:417:in block in each_strongly_connected_component_from' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/railties-4.0.5/lib/rails/initializable.rb:44:in each' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/railties-4.0.5/lib/rails/initializable.rb:44:in tsort_each_child' from /Users/sjohnson/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:411:in call' from /Users/sjohnson/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:411:in each_strongly_connected_component_from' from /Users/sjohnson/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:347:in block in each_strongly_connected_component' from /Users/sjohnson/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:345:in each' from /Users/sjohnson/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:345:in call' from /Users/sjohnson/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:345:in each_strongly_connected_component' from /Users/sjohnson/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:224:in tsort_each' from /Users/sjohnson/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:205:in tsort_each' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/railties-4.0.5/lib/rails/initializable.rb:54:in run_initializers' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/railties-4.0.5/lib/rails/application.rb:215:in initialize!' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/railties-4.0.5/lib/rails/railtie/configurable.rb:30:in method_missing' from /Users/sjohnson/my_app/config/environment.rb:5:in <top (required)>' from /Users/sjohnson/my_app/spec/spec_helper.rb:10:in require' from /Users/sjohnson/my_app/spec/spec_helper.rb:10:in <top (required)>' from /Users/sjohnson/my_app/spec/api/v1/api_authentication_spec.rb:1:in require' from /Users/sjohnson/my_app/spec/api/v1/api_authentication_spec.rb:1:in <top (required)>' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/rspec-core-3.0.3/lib/rspec/core/configuration.rb:1057:in load' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/rspec-core-3.0.3/lib/rspec/core/configuration.rb:1057:in block in load_spec_files' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/rspec-core-3.0.3/lib/rspec/core/configuration.rb:1057:in each' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/rspec-core-3.0.3/lib/rspec/core/configuration.rb:1057:in load_spec_files' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/rspec-core-3.0.3/lib/rspec/core/runner.rb:97:in setup' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/rspec-core-3.0.3/lib/rspec/core/runner.rb:85:in run' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/rspec-core-3.0.3/lib/rspec/core/runner.rb:70:in run' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/rspec-core-3.0.3/lib/rspec/core/runner.rb:38:in invoke' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/gems/rspec-core-3.0.3/exe/rspec:4:in ' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/bin/rspec:23:in load' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/bin/rspec:23:in ' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/bin/ruby_executable_hooks:15:in eval' from /Users/sjohnson/.rvm/gems/ruby-2.1.2@rails4/bin/ruby_executable_hooks:15:in '

I attempted to run: bundle exec rails generate paper_trail:install

It indicated that the migration file already existed (PaperTrail was working under 1.9.3). So, I ran it again: bundle exec rails generate paper_trail:install -s

It completed successfully, but I have the same issue.

config/initializers/paper_trail.rb:

# the following line is required for PaperTrail >= 3.0.3 with Rails 
PaperTrail::Rails::Engine.eager_load! 

module PaperTrail 
    class Version < ActiveRecord::Base 
    attr_accessible :captain 
    end 
end ` 

想法？其他信息會有幫助嗎？

編輯： 儘管以paper_trail在初始化文件3.0.3參考，創業板是在3.0.5版本（如通過做寶石列表驗證）。錯誤跟蹤中對3.0.3的引用是針對Rspec的。

Answer 1

我只是在我的初始化做：

module PaperTrail 
    module Rails 
    class Engine < ::Rails::Engine 
     paths['app/models'] << 'lib/paper_trail/frameworks/active_record/models' 
    end 
    end 
end 

，我建議你把這個：

PaperTrail::Rails::Engine.eager_load!` 

在初始化最後一個字符串。