rake中止！对于ActiveRecord :: Base，未定义的方法`migration_error ='

我正在Ruby on Rails上开发项目到目前为止，我使用Rails 4，并且在我遇到无法使用gem的问题之前，一切都很好。我决定回滚到Rails 3，更改我的Gemfile，删除Gemfile.lock，所有的rails安装和railties。然后我运行bundle install并安装Rails 3.2.13。但是现在当我运行rake db时：创建一切还是很好的。当我运行耙分贝：迁移问题开始：？rake中止！对于ActiveRecord :: Base，未定义的方法`migration_error ='

JeffreeBook:llvoo kristijonas$ rake db:migrate 
WARNING: Nokogiri was built against LibXML version 2.8.0, but has dynamically loaded 2.7.8 
rake aborted! 
undefined method `migration_error=' for ActiveRecord::Base:Class 
/Users/kristijonas/.rvm/gems/[email protected]/gems/activerecord-3.2.13/lib/active_record/dynamic_matchers.rb:55:in `method_missing' 
/Users/kristijonas/.rvm/gems/[email protected]/gems/activerecord-3.2.13/lib/active_record/railtie.rb:66:in `block (3 levels) in <class:Railtie>' 
/Users/kristijonas/.rvm/gems/[email protected]/gems/activerecord-3.2.13/lib/active_record/railtie.rb:65:in `each' 
/Users/kristijonas/.rvm/gems/[email protected]/gems/activerecord-3.2.13/lib/active_record/railtie.rb:65:in `block (2 levels) in <class:Railtie>' 
/Users/kristijonas/.rvm/gems/[email protected]/gems/activesupport-3.2.13/lib/active_support/lazy_load_hooks.rb:36:in `instance_eval' 
/Users/kristijonas/.rvm/gems/[email protected]/gems/activesupport-3.2.13/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook' 
/Users/kristijonas/.rvm/gems/[email protected]/gems/activesupport-3.2.13/lib/active_support/lazy_load_hooks.rb:43:in `block in run_load_hooks' 
/Users/kristijonas/.rvm/gems/[email protected]/gems/activesupport-3.2.13/lib/active_support/lazy_load_hooks.rb:42:in `each' 
/Users/kristijonas/.rvm/gems/[email protected]/gems/activesupport-3.2.13/lib/active_support/lazy_load_hooks.rb:42:in `run_load_hooks' 
/Users/kristijonas/.rvm/gems/[email protected]/gems/activerecord-3.2.13/lib/active_record/base.rb:720:in `<top (required)>' 
/Users/kristijonas/.rvm/gems/[email protected]/gems/activerecord-3.2.13/lib/active_record/railties/databases.rake:25:in `block (2 levels) in <top (required)>' 
/Users/kristijonas/.rvm/gems/[email protected]/bin/ruby_noexec_wrapper:14:in `eval' 
/Users/kristijonas/.rvm/gems/[email protected]/bin/ruby_noexec_wrapper:14:in `<main>' 
Tasks: TOP => db:migrate => db:load_config 
(See full trace by running task with --trace) 
JeffreeBook:llvoo kristijonas$

如何解决这一切都很好，与DB配置

来源

2013-08-01 Iliya Stepanov

尝试运行包更新，也许 –

等同于这个问题http://stackoverflow.com/questions/16364347/dynamic-matchers-rb55in-method-missing- undefined-method-migration-error –

尝试：

 
bundle exec rake db:migrate

来源

2013-08-01 17:39:52 Anil

谢谢，但它导致相同的结果:( –

你可以卸载libxml和nokogiri并重新安装吗？ – Anil

这是一个字符串在config/initializers或环境中。它是什么字符串，但仔细检查该文件，如果你从Rails 4回滚到3，并面临类似的问题。 –

滚动一个Rails 4项目回Rails 3为我造成了这个错误。删除以下行从config/environments/development.rb解决了该问题：

config.active_record.migration_error = :page_load

来源

2014-07-15 17:18:32

尽可能不可能，这是我的情况正确的答案。 –

rake中止！对于ActiveRecord :: Base，未定义的方法`migration_error ='

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