ruby-on-rails - ApplicationController :Class 的路由错误未定义局部变量或方法 `with'

Question

我是 Rails 的新手，我不明白为什么会出现此错误:

undefined local variable or method `with' for ApplicationController:Class

路由:

root 'home#index'

Controller :

class HomeController < ApplicationController

  def new
  end

  def index
  end

end

应用跟踪:

app/controllers/application_controller.rb:4:in `<class:ApplicationController>'
app/controllers/application_controller.rb:1:in `<top (required)>'
app/controllers/home_controller.rb:1:in `<top (required)>'

我已经更新了一些模型和 rspec 代码来测试模型验证，但除此之外我没有创建其他 Controller / View /路由等。

注意:ruby 2.0.0，rails 4.0.0

应用程序 Controller :

class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with::exception
end

也许这是一些吓坏了的 gem ？

gem 文件:

source 'https://rubygems.org'
ruby '2.0.0'


# See https://github.com/sstephenson/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby


gem 'rails', '4.0.0'

group :development do
  gem 'sqlite3', '1.3.7'
  gem 'rspec-rails', '2.14.0'
  gem 'guard-rspec', '3.0.2'
  gem 'guard-spork', '1.5.1'
  gem 'factory_girl', '4.2.0'
  gem 'factory_girl_rails', '4.2.1'
end
gem 'mysql', '2.9.1'
gem 'mysql2', '0.3.13'

gem 'sass-rails', '4.0.0'
gem 'uglifier', '2.1.1'
gem 'coffee-rails', '4.0.0'
gem 'jquery-rails', '2.2.1'
gem 'turbolinks', '1.1.1'
gem 'jbuilder', '1.2'


group :test do
  gem 'email_spec', '1.5.0'
  #gem 'selenium-webdriver', '2.0.0'
  #gem 'capybara', '2.1.0'
end

group :doc do
  gem 'sdoc', '0.3.20', require: false
end

Answer 1

看起来你需要在第 4 行有一个空格。

所以

protect_from_forgery with::exception

变成:

protect_from_forgery with: :exception

原因是 protect_from_forgery 是一种将散列作为其唯一参数的方法。