我继承了一个我相信是用rails 3编写的rails应用程序。我现在正在运行rails 4.2.3。当我尝试在本地运行应用程序（rails s）时，我收到了许多与活动记录和初始化程序相关的错误。我已经单独搜索过这些错误，但到目前为止我所做的一切都没有用。
我添加了这里提到的受保护属性gem https://github.com/rails/protected_attributes/issues/5
我将gem文件升级为使用rails 4
我已使用捆绑升级升级了宝石。没运气。
我已向原始开发者发送了一条消息，他不知道为什么会这样。
为了让这个应用程序在本地运行而不出错，我需要做什么？
这是我在终端中运行rails时遇到的错误：
Astrids-MacBook-Air% rails s
=> Booting WEBrick
=> Rails 4.2.3 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
config.eager_load is set to nil. Please update your config/environments/*.rb files accordingly:
* development - set it to false
* test - set it to false (unless you use a tool that preloads your test environment)
* production - set it to true
Exiting
/Users/Astrid/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.3/lib/active_record/dynamic_matchers.rb:26:in `method_missing': undefined method `auto_explain_threshold_in_seconds=' for ActiveRecord::Base:Class (NoMethodError)
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.3/lib/active_record/railtie.rb:108:in `block (3 levels) in <class:Railtie>'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.3/lib/active_record/railtie.rb:107:in `each'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.3/lib/active_record/railtie.rb:107:in `block (2 levels) in <class:Railtie>'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.3/lib/active_support/lazy_load_hooks.rb:38:in `instance_eval'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.3/lib/active_support/lazy_load_hooks.rb:38:in `execute_hook'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.3/lib/active_support/lazy_load_hooks.rb:28:in `block in on_load'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.3/lib/active_support/lazy_load_hooks.rb:27:in `each'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.3/lib/active_support/lazy_load_hooks.rb:27:in `on_load'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.3/lib/active_record/railtie.rb:106:in `block in <class:Railtie>'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/railties-4.2.3/lib/rails/initializable.rb:30:in `instance_exec'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/railties-4.2.3/lib/rails/initializable.rb:30:in `run'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/railties-4.2.3/lib/rails/initializable.rb:55:in `block in run_initializers'
from /Users/Astrid/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/tsort.rb:226:in `block in tsort_each'
from /Users/Astrid/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/tsort.rb:348:in `block (2 levels) in each_strongly_connected_component'
from /Users/Astrid/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/tsort.rb:429:in `each_strongly_connected_component_from'
from /Users/Astrid/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/tsort.rb:347:in `block in each_strongly_connected_component'
from /Users/Astrid/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/tsort.rb:345:in `each'
from /Users/Astrid/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/tsort.rb:345:in `call'
from /Users/Astrid/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/tsort.rb:345:in `each_strongly_connected_component'
from /Users/Astrid/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/tsort.rb:224:in `tsort_each'
from /Users/Astrid/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/tsort.rb:203:in `tsort_each'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/railties-4.2.3/lib/rails/initializable.rb:54:in `run_initializers'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/railties-4.2.3/lib/rails/application.rb:352:in `initialize!'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/railties-4.2.3/lib/rails/railtie.rb:194:in `public_send'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/railties-4.2.3/lib/rails/railtie.rb:194:in `method_missing'
from /Users/Astrid/Documents/Development/Handled/ticketsnap_server/config/environment.rb:5:in `<top (required)>'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:in `require'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:in `block in require'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:240:in `load_dependency'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:in `require'
from /Users/Astrid/Documents/Development/Handled/ticketsnap_server/config.ru:3:in `block in <main>'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/builder.rb:55:in `instance_eval'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/builder.rb:55:in `initialize'
from /Users/Astrid/Documents/Development/Handled/ticketsnap_server/config.ru:in `new'
from /Users/Astrid/Documents/Development/Handled/ticketsnap_server/config.ru:in `<main>'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/builder.rb:49:in `eval'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/builder.rb:49:in `new_from_string'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/builder.rb:40:in `parse_file'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/server.rb:299:in `build_app_and_options_from_config'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/server.rb:208:in `app'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/railties-4.2.3/lib/rails/commands/server.rb:61:in `app'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/server.rb:336:in `wrapped_app'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/railties-4.2.3/lib/rails/commands/server.rb:139:in `log_to_stdout'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/railties-4.2.3/lib/rails/commands/server.rb:78:in `start'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:80:in `block in server'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:75:in `tap'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:75:in `server'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /Users/Astrid/.rvm/gems/ruby-2.2.1/gems/railties-4.2.3/lib/rails/commands.rb:17:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
答案 0 :(得分：0)
如发行说明中所述删除 auto_explain_threshold_in_seconds。