Question

我正在编写一个学习Rails开发的教程。

如果这个问题多余，我道歉。可能是我的初学经验水平使得难以找到相关的现有答案。

真正感谢任何帮助。

本课程的目的是构建一个类似Reddit的站点。在本课中，我应该使用带有CarrierWave和MiniMagick宝石的S3存储来实现图像上传。据我所知，我已经密切关注了课程的说明，但也许我错过了一些东西。

当我尝试从编辑视图上传图像文件时，会发生这种情况。

这是错误：

app/controllers/users_controller.rb:5:in `update'


Rendered /Users/gregorybowler/.rvm/gems/ruby-2.2.1/gems/actionpack-4.2.1/lib/action_dispatch/middleware/templates/rescues/_source.erb (8.5ms)
Rendered /Users/gregorybowler/.rvm/gems/ruby-2.2.1/gems/actionpack-4.2.1/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (3.5ms)
Rendered /Users/gregorybowler/.rvm/gems/ruby-2.2.1/gems/actionpack-4.2.1/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (2.4ms)
Rendered /Users/gregorybowler/.rvm/gems/ruby-2.2.1/gems/actionpack-4.2.1/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb within rescues/layout (64.7ms)
Cannot render console with content type multipart/form-dataAllowed content types: [#<Mime::Type:0x007fd34a40cb10 @synonyms=["application/xhtml+xml"], @symbol=:html, @string="text/html">, #<Mime::Type:0x007fd34a40ce30 @synonyms=[], @symbol=:text, @string="text/plain">, #<Mime::Type:0x007fd3493e8d88 @synonyms=[], @symbol=:url_encoded_form, @string="application/x-www-form-urlencoded">]


Started PATCH "/users/8" for ::1 at 2015-07-03 22:05:20 -0700

ActionController::RoutingError (uninitialized constant UsersController):
activesupport (4.2.1) lib/active_support/inflector/methods.rb:261:in `const_get'
activesupport (4.2.1) lib/active_support/inflector/methods.rb:261:in `block in constantize'
activesupport (4.2.1) lib/active_support/inflector/methods.rb:259:in `each'
activesupport (4.2.1) lib/active_support/inflector/methods.rb:259:in `inject'
activesupport (4.2.1) lib/active_support/inflector/methods.rb:259:in `constantize'

这是我的user_controller.rb文件：

class UsersController < ApplicationController
  before_action :authenticate_user!

def update
  if current_user.update_attributes(user_params)
    flash[:notice] = "User information updated"
    redirect_to edit_user_registration_path
  else
    flash[:error] = "Invalid user information"
    redirect_to edit_user_registration_path
  end
end

 private

 def user_params
   params.require(:user).permit(:name, :avatar)
 end
end

这是config / routes.rb

Rails.application.routes.draw do
  devise_for :users
  resources :users, only: [:update]

resources :topics do
  resources :posts, except: [:index]
end

  get 'about' => 'welcome#about'

  root to: 'welcome#index'
end

Answer 1

当我遇到它时，我皱着眉头好了10分钟。错误表明它没有找到您的UsersController常数，这是您的类。

你说这是user_controller.rb。但是，Rails自动加载只能找到UsersController，注意's'，你猜对了，app/controllers/users_controller.rb。（很难记住，惯例规定#{thing}Controller是复数）

路由错误未初始化的常量UsersController

1 个答案: