ruby-on-rails - 出现无法自动加载常量 UsersController 的错误

Question

我在访问 /users/new 时遇到错误在 Rails 4 中为 Unable to autoload constant UsersController, expecting /app/controllers/users_controller.rb to define it .

这是 Controller 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

以及 new.html.erb 的 View 我有:

  <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模型:

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

Answer 1

Rails 期望 Controller 名称为复数形式。您发布的第一个文件内容的第一行写为单数:

在 /app/controllers/users_controller.rb你有:

class UserController < ApplicationController

相反，它应该是:

class UsersController < ApplicationController

此 Rails Guide提供了在路由文件中定义资源的示例。此外，还有一个信息说明解释了如何使用 resource 定义路由。方法将始终映射到 Controller 的复数名称。

这是指南中的信息说明。

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).

来源: Resource Routing: The Rails Default