Cloud9 IDE+Ruby on Rails 4遇XML解析错误，疑为Devise路由问题

Hey there, let's work through this problem step by step. First, your suspicion about routing issues (especially with Devise) is spot-on—your routes.rb has some clear conflicts that could be causing unexpected behavior, and that might even be indirectly triggering the Cloud9 API error you're seeing.

1. Fix the Routing Configuration First #

Let's start with the most obvious culprit: your routes.rb has several issues that can break routing logic and cause unexpected page/request behavior.

Key Problems in Your Current Routes: #

• Incorrect Devise Nesting: Putting devise_for :users inside the :users namespace generates wonky routes like /users/users/sign_in, which Devise doesn't handle properly. Devise routes should live at the global level unless you're intentionally separating multiple user models.
• Redundant Route Definitions: You already have resources :pages, which automatically generates all standard RESTful routes (GET pages/new, POST pages/create, GET pages/show, etc.). Manually adding match routes for these actions creates conflicts that confuse Rails' route matcher.
• Namespace-Locked Root Route: The root inside namespace :users only sets the default path for /users—you don't have a global root route, which can cause page load issues when the app tries to redirect to a default path.

Revised routes.rb Example: #

Rails.application.routes.draw do
  # Set a global root route (adjust to your default landing page)
  root to: 'pages#index'

  # Devise routes at the global level (standard setup)
  devise_for :users

  # RESTful routes for pages—no need for manual match definitions
  resources :pages

  # If you need user-specific custom routes, add them here (avoid conflicting with Devise)
  namespace :users do
    # Example: get 'dashboard', to: 'dashboards#show'
  end
end

2. Verify Your Routes #

After updating the file, run this command in your Cloud9 terminal to list all generated routes and confirm there are no conflicts or weird paths:

rake routes

Check that Devise routes (like sign_in, sign_up) show up as /users/sign_in (not nested under /users/users/) and that pages routes match standard RESTful patterns.

3. Troubleshoot the XML Parsing Error #

While the error comes from Cloud9's API, it's likely a side effect of your app's routing issues causing page load failures (which disrupts Cloud9's IDE state sync). After fixing routes:

• Restart your Rails server
• Refresh your Firefox tab and check the console again
• If the error persists:
  • Clear Firefox's cache and cookies for your Cloud9 workspace
  • Restart your Cloud9 workspace to reset the IDE session
  • Confirm your Cloud9 access token is valid (this is usually managed automatically, but a session refresh can fix it)

内容的提问来源于stack exchange，提问作者Kev