Rails 4 rake db：在设计安装后迁移导致无效路由错误

我在认证中使用Rails 4在Action本书中遇到了一个问题。Rails 4 rake db：在设计安装后迁移导致无效路由错误

我将gem "devise", "~> 3.4.1"添加到我的Gemfile中，运行bundle，并运行生成器rails g devise:install。

然后，我发现用户喜欢它是用书写的：rails g devise user。

直到这部分一切都很好。然后我跑bundle exec rake db:migrate和得到这个错误：

$ bundle exec rake db:migrate 
rake aborted! 
ArgumentError: Invalid route name, already in use: 'new_user_session' 
You may have defined two routes with the same name using the `:as` option, or you may be overriding a route already defined by a resource with the same naming. For the latter, you can restrict the routes created with `resources` as explained here: 
http://guides.rubyonrails.org/routing.html#restricting-the-routes-created 
/var/lib/gems/2.3.0/gems/devise-3.4.1/lib/devise/rails/routes.rb:360:in `block in devise_session' 
/var/lib/gems/2.3.0/gems/devise-3.4.1/lib/devise/rails/routes.rb:359:in `devise_session' 
/var/lib/gems/2.3.0/gems/devise-3.4.1/lib/devise/rails/routes.rb:249:in `block (4 levels) in devise_for' 
/var/lib/gems/2.3.0/gems/devise-3.4.1/lib/devise/rails/routes.rb:249:in `each' 
/var/lib/gems/2.3.0/gems/devise-3.4.1/lib/devise/rails/routes.rb:249:in `block (3 levels) in devise_for' 
/var/lib/gems/2.3.0/gems/devise-3.4.1/lib/devise/rails/routes.rb:452:in `with_devise_exclusive_scope' 
/var/lib/gems/2.3.0/gems/devise-3.4.1/lib/devise/rails/routes.rb:248:in `block (2 levels) in devise_for' 
/var/lib/gems/2.3.0/gems/devise-3.4.1/lib/devise/rails/routes.rb:351:in `block in devise_scope' 
/var/lib/gems/2.3.0/gems/devise-3.4.1/lib/devise/rails/routes.rb:350:in `devise_scope' 
/var/lib/gems/2.3.0/gems/devise-3.4.1/lib/devise/rails/routes.rb:247:in `block in devise_for' 
/var/lib/gems/2.3.0/gems/devise-3.4.1/lib/devise/rails/routes.rb:223:in `each' 
/var/lib/gems/2.3.0/gems/devise-3.4.1/lib/devise/rails/routes.rb:223:in `devise_for' 
/home/rafal/ruby_workspace/ticketee/config/routes.rb:4:in `block (2 levels) in <top (required)>' 
/home/rafal/ruby_workspace/ticketee/config/routes.rb:3:in `block in <top (required)>' 
/home/rafal/ruby_workspace/ticketee/config/routes.rb:1:in `<top (required)>' 
/home/rafal/ruby_workspace/ticketee/config/environment.rb:5:in `<top (required)>'/var/lib/gems/2.3.0/gems/rake-11.2.2/exe/rake:27:in `<top (required)>' 
Tasks: TOP => db:migrate => environment 
(See full trace by running task with --trace)

这里是我的routes.rb：

Rails.application.routes.draw do 
    devise_for :users 
    Rails.application.routes.draw do 
    devise_for :users 
    root "projects#index" 

    resources :projects do 
     resources :tickets 
    end 
    end 
end

来源

2016-07-07 fafal

请发布'config/routes.rb'的内容。 – SoAwesomeMan

我把它作为回答 – fafal

Okomikeruko的解决方案看起来合法。如果有效，您应该考虑接受它作为答案：http：//meta.stackexchange.com/a/5235/249307。另外，请不要发布数据作为答案 - 要么1）**编辑**您的问题包括它;或者2）在https://gist.github.com等其他地方发布它，并使用** edit **在您的问题中包含链接。 – SoAwesomeMan

看起来你已经有了不好的嵌套的情况下

它应该是这样的：

Rails.application.routes.draw do 
    root "projects#index" 
    devise_for :users 
    resources :projects do 
    resources :tickets 
    end 
end

来源

2016-07-07 22:12:46 Okomikeruko

Rails 4 rake db：在设计安装后迁移导致无效路由错误

回答

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