db:migrate 时未定义的方法“less”

Question

当我尝试 db:migrate 我的应用程序时，我收到此错误：

rake aborted!
undefined method `less' for #<Rails::Application::Configuration:0x007fdca55c75e0>
/app/vendor/bundle/ruby/2.1.0/gems/railties-4.0.3/lib/rails/railtie/configuration.rb:95:in `method_missing'
/app/vendor/bundle/ruby/2.1.0/bundler/gems/twitter-bootstrap-rails-965ebd304f74/lib/twitter/bootstrap/rails/engine.rb:17:in `block in <class:Engine>'
/app/vendor/bundle/ruby/2.1.0/gems/railties-4.0.3/lib/rails/initializable.rb:30:in `instance_exec'
/app/vendor/bundle/ruby/2.1.0/gems/railties-4.0.3/lib/rails/initializable.rb:30:in `run'
/app/vendor/bundle/ruby/2.1.0/gems/railties-4.0.3/lib/rails/initializable.rb:55:in `block in run_initializers'
/app/vendor/bundle/ruby/2.1.0/gems/railties-4.0.3/lib/rails/initializable.rb:54:in `run_initializers'
/app/vendor/bundle/ruby/2.1.0/gems/railties-4.0.3/lib/rails/application.rb:215:in `initialize!'
/app/vendor/bundle/ruby/2.1.0/gems/railties-4.0.3/lib/rails/railtie/configurable.rb:30:in `method_missing'
/app/config/environment.rb:6:in `<top (required)>'
/app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.0.3/lib/active_support/dependencies.rb:229:in `require'
/app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.0.3/lib/active_support/dependencies.rb:229:in `block in require'
/app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.0.3/lib/active_support/dependencies.rb:214:in `load_dependency'
/app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.0.3/lib/active_support/dependencies.rb:229:in `require'
/app/vendor/bundle/ruby/2.1.0/gems/railties-4.0.3/lib/rails/application.rb:189:in `require_environment!'
/app/vendor/bundle/ruby/2.1.0/gems/railties-4.0.3/lib/rails/application.rb:250:in `block in run_tasks_blocks'
Tasks: TOP => db:migrate => environment

可能出了什么问题？我已经在 Gemfile 中有gem 'less', '2.4.0'

Answer 1

添加 therubyracer gem 和 less-rails gem

gem "therubyracer"
gem "less-rails"
gem "twitter-bootstrap-rails"

请查看 gem 中的问题链接：https://github.com/seyhunak/twitter-bootstrap-rails/issues/437