得到错误因为无法自动加载常量UsersController

I am getting an error while visiting /users/new in Rails 4 as Unable to autoload constant UsersController, expecting /app/controllers/users_controller.rb to define it.

我在访问Rails 4中的/ users / new时遇到错误，因为无法自动加载常量UsersController，期望/app/controllers/users_controller.rb定义它。

Here is the controller code

这是控制器代码

    class UserController < ApplicationController
     def new
      @user = User.new
     end

     def create
      @user = User.new(params[:user]).permit(:email,  :password,:password_confirmation)

      respond_to do |format|
       if @user.save
        format.html { redirect_to new_user_path, notice: 'User was successfully created.' }
        format.json { render action: 'show', status: :created, location: @user }
       else
        format.html { render action: 'new' }
        format.json { render json: @user.errors, status: :unprocessable_entity }
       end
      end
    end 
  end

And the view for new.html.erb I have is:

我对new.html.erb的看法是：

  <h1>Sign up</h1>

  <%= form_for(@user)  do |f| %>

    <% if @user.errors.any? %>
      <div id="error_explanation">
        <h2><%= pluralize(@user.errors.count, "error") %> prohibited this post from being      saved:</h2>

        <ul>
          <% @user.errors.full_messages.each do |msg| %>
            <li><%= msg %></li>
          <% end %>
        </ul>
     </div>
   <% end %>
   <div class="field">
    <%= f.label :email %><br>
    <%= f.text_field :email %>
   </div>
   <div class="field">
    <%= f.label :password %><br>
    <%= f.password_field :password %>
   </div>
   <div class="field">
    <%= f.label :password_confirmation, "Confirmation" %>
    <%= f.password_field :password_confirmation %>
   </div>
   <div class="actions">
    <%= f.submit "Create my account" %>
   </div>
 <% end %>

User model:

用户模型：

class User < ActiveRecord::Base
  has_many :projects
  has_many :pledges
  has_many :posts
  has_many :comments
end

1 个解决方案

#1

Rails expects controller names to be pluralized. The very first line of the the first file contents you posted is written as singular:

Rails期望控制器名称是多元化的。您发布的第一个文件内容的第一行写为单数：

In /app/controllers/users_controller.rb you have:

在/app/controllers/users_controller.rb中你有：

class UserController < ApplicationController

class UserController

Instead, it should be:

相反，它应该是：

class UsersController < ApplicationController

class UsersController

This Rails Guide provides an example for defining a resource in your routes file. Further, there is an informational note that explains that defining a routes with the resource method will always map to the pluralized name of the controller.

此Rails指南提供了在路由文件中定义资源的示例。此外，还有一条信息说明解释了使用资源方法定义路由将始终映射到控制器的复数名称。

This is the informational note from the guide.

这是指南中的信息性说明。

Because you might want to use the same controller for a singular route (/account) and a plural route (/accounts/45), singular resources map to plural controllers. So that, for example, resource :photo and resources :photos creates both singular and plural routes that map to the same controller (PhotosController).

因为您可能希望对单个路径（/ account）和复数路径（/ accounts / 45）使用相同的控制器，所以单个资源映射到多个控制器。因此，例如，资源：照片和资源：照片创建映射到同一控制器（PhotosController）的单个和多个路线。

source: Resource Routing: The Rails Default

source：资源路由：Rails默认

#1