模块`ActionView :: Helpers :: FormHelper'的未定义方法`form_for'

Question

哎呀！ 一切都很好，然后突然间，当我做一个'rake db：migrate'时，我开始收到这个错误 当我尝试重启rails服务器时，我得到同样的东西。

rake aborted!
undefined method 'form_for' for module `ActionView::Helpers::FormHelper'

确认我正在运行当前版本： mm-MacBookPro：trunk mm $ rails -v Rails 2.3.5

我最近没有添加任何form_for，而且它们工作正常。 我重新启动并重新安装了rails。到底能造成什么呢？

这是--trace

  

**调用db：migrate（first_time）   **调用环境（first_time）   **执行环境耙中止！ undefined方法form_for' for module ActionView :: Helpers :: FormHelper'   /Users/mm/.gem/ruby/1.9.1/gems/haml-2.2.19/lib/haml/helpers/action_view_mods.rb:174:in   alias_method' /Users/mm/.gem/ruby/1.9.1/gems/haml-2.2.19/lib/haml/helpers/action_view_mods.rb:174:in ”   /Users/mm/.gem/ruby/1.9.1/gems/haml-2.2.19/lib/haml/helpers/action_view_mods.rb:159:in   <module:Helpers>' /Users/mm/.gem/ruby/1.9.1/gems/haml-2.2.19/lib/haml/helpers/action_view_mods.rb:41:in ”   /Users/mm/.gem/ruby/1.9.1/gems/haml-2.2.19/lib/haml/helpers/action_view_mods.rb:1:in   <top (required)>' /Volumes/Development/tc/app/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in 需要”   /Volumes/Development/tc/app/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in   block in require' /Volumes/Development/tc/app/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in new_constants_in'   /Volumes/Development/tc/app/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in   require' /Users/mm/.gem/ruby/1.9.1/gems/haml-2.2.19/lib/haml/helpers.rb:2:in ”   /Volumes/Development/tc/app/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in   需要require' /Volumes/Development/tc/app/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in 阻止   /Volumes/Development/tc/app/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in   new_constants_in' /Volumes/Development/tc/app/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in 需要”   /Users/mm/.gem/ruby/1.9.1/gems/haml-2.2.19/lib/haml/engine.rb:1:in   <top (required)>' /Volumes/Development/tc/app/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in 需要”   /Volumes/Development/tc/app/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in   block in require' 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  /Volumes/Development/tc/app/trunk/vendor/rails/railties/lib/rails/plugin.rb:146:in   evaluate_init_rb中的eval' /Volumes/Development/tc/app/trunk/vendor/rails/railties/lib/rails/plugin.rb:146:in 阻止   /Volumes/Development/tc/app/trunk/vendor/rails/activesupport/lib/active_support/core_ext/kernel/reporting.rb:11:in   silence_warnings' /Volumes/Development/tc/app/trunk/vendor/rails/railties/lib/rails/plugin.rb:142:in evaluate_init_rb”   /Volumes/Development/tc/app/trunk/vendor/rails/railties/lib/rails/plugin.rb:48:in   load_plugins中的load' /Volumes/Development/tc/app/trunk/vendor/rails/railties/lib/rails/plugin/loader.rb:38:in 阻止   /Volumes/Development/tc/app/trunk/vendor/rails/railties/lib/rails/plugin/loader.rb:37:in   each' /Volumes/Development/tc/app/trunk/vendor/rails/railties/lib/rails/plugin/loader.rb:37:in load_plugins'   /Volumes/Development/tc/app/trunk/vendor/rails/railties/lib/initializer.rb:348:in   load_plugins' /Volumes/Development/tc/app/trunk/vendor/rails/railties/lib/initializer.rb:163:in 过程   /Volumes/Development/tc/app/trunk/vendor/rails/railties/lib/initializer.rb:113:in   run' /Volumes/Development/tc/app/trunk/config/environment.rb:13:in ”   /Volumes/Development/tc/app/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in   需要require' /Volumes/Development/tc/app/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in 阻止   /Volumes/Development/tc/app/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in   new_constants_in' /Volumes/Development/tc/app/trunk/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in 需要”   /Volumes/Development/tc/app/trunk/vendor/rails/railties/lib/tasks/misc.rake:4:in   block in <top (required)>' /usr/local/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:636:in称之为”   /usr/local/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:636:in block in execute' 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Answer 1

这很奇怪。由于某种原因，HAML正在与ActionView作斗争。它看起来像是在ActionView之前加载HAML？您的申请中对HAML有任何奇怪的要求吗？

您是否尝试过升级HAML宝石？您是否也可以尝试在config/environment.rb中禁用该插件，然后运行您的佣金任务？

如果你根本不使用HAML，那么你也可以从vendor/plugins删除该插件。