我似乎无法为我的 rails 应用程序生成迁移，我该如何解决这个错误？

Question

    A:/Dev/Web/private_app/config/initializers/simple_form.rb:2:in`<top (required)>': uninitialized constant SimpleForm (NameErr
    or)
    from e:/Dev/Rails/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.8/lib/rails/engine.rb:648:in `block in load_config_initializ
    er'
    from e:/Dev/Rails/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/activesupport-4.1.8/lib/active_support/notifications.rb:161:in `instrumen
    t'
    from e:/Dev/Rails/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.8/lib/rails/engine.rb:647:in `load_config_initializer'
    from e:/Dev/Rails/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.8/lib/rails/engine.rb:612:in `block (2 levels) in <class:Eng
    ine>'
    from e:/Dev/Rails/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.8/lib/rails/engine.rb:611:in `each'
    from e:/Dev/Rails/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.8/lib/rails/engine.rb:611:in `block in <class:Engine>'
    from e:/Dev/Rails/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.8/lib/rails/initializable.rb:30:in `instance_exec'
    from e:/Dev/Rails/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.8/lib/rails/initializable.rb:30:in `run'
    from e:/Dev/Rails/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.8/lib/rails/initializable.rb:55:in `block in run_initializer
    s'
    from e:/Dev/Rails/Ruby2.1.0/lib/ruby/2.1.0/tsort.rb:226:in `block in tsort_each'
    from e:/Dev/Rails/Ruby2.1.0/lib/ruby/2.1.0/tsort.rb:348:in `block (2 levels) in each_strongly_connected_component'
    from e:/Dev/Rails/Ruby2.1.0/lib/ruby/2.1.0/tsort.rb:418:in `block (2 levels) in each_strongly_connected_component_from'
    from e:/Dev/Rails/Ruby2.1.0/lib/ruby/2.1.0/tsort.rb:427:in `each_strongly_connected_component_from'
    from e:/Dev/Rails/Ruby2.1.0/lib/ruby/2.1.0/tsort.rb:417:in `block in each_strongly_connected_component_from'

以上是我每次尝试生成迁移时收到的错误。我该如何克服这个问题或从哪里开始调试？

Answer 1

您似乎已经部分安装了 Simple Form。

如果您在项目中使用 Simple Form，请尝试将 gem 'simple_form' 添加到您的 Gemfile，然后添加运行 bundle install。如果您没有使用 Simple Form，请尝试从您的 Rails 项目中删除 config/initializers/simple_form.rb 文件。

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