用户中的无方法错误#索引

Question

我对以下应用程序有问题，我一直在railsCasts的Rails 3中进行第211集验证，但当我尝试添加类EmailFormatValidator时，会触发一个错误

NoMethodError in Users#index

Showing /home/fernando/Validations/store/app/views/users/index.html.erb where line #12 raised:

undefined method `each' for nil:NilClass
Extracted source (around line #12):

9:     <th></th>
10:   </tr>
11: 
12: <% @users.each do |user| %>
13:   <tr>
14:     <td><%= user.name %></td>
15:     <td><%= user.email %></td>
Rails.root: /home/fernando/Validations/store

模型/user.rb

class User < ActiveRecord::Base
  validates :email, :presence => true, :uniqueness => true, :email_format => true
end

lib/email_format_validator.rb

class EmailFormatValidator < ActiveModel::EachValidator
  def validate_each(object, attribute, value)
    unless value =~ /^([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i
      object.errors[attribute] << (options[:message] || "is not formatted properly") 
    end
  end
end

/controller/user.rb

class UsersController < ApplicationController
  # GET /users
  # GET /users.json
  def index
    @users = User.all

    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @users }
    end
  end

  # GET /users/1
  # GET /users/1.json
  def show
    @user = User.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.json { render json: @user }
    end
  end

# GET/users/new # GET/users/new . JSON def new @ user = user . new

respond_to do |format|
  format.html # new.html.erb
  format.json { render json: @user }
end

终止

# GET /users/1/edit def edit @user = User.find（params[：id]） end

#POST /users#POST/users.json创建@user=User.new（参数[： user]）

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

终止

#PUT/users/1#PUT/users1.json def update@user=user.find（params[：id]）

respond_to do |format|
  if @user.update_attributes(params[:user])
    format.html { redirect_to @user, notice: 'User was successfully updated.' }
    format.json { head :no_content }
  else
    format.html { render action: "edit" }
    format.json { render json: @user.errors, status: :unprocessable_entity }
  end
end

终止

#删除 /users/1#删除 /users/1.jsondef销毁@user=User.find（params[： id]）@user.destroy

respond_to do |format|
  format.html { redirect_to users_url }
  format.json { head :no_content }
end

结束 结束

当我单击用户控制器#索引中的一次性参数错误时，出现此错误

Unknown validator: 'EmailFormatValidator'
Rails.root: /home/fernando/Validations/store

Answer 1

请在应用程序文件夹中创建验证程序目录。

您的文件名应类似于验证器文件夹中的 email_format_validator.rb

#app/model/user.rb
class User < ActiveRecord::Base
  validates :email, :presence => true, :uniqueness => true, :email_format => true
end

请从“lib文件夹”中删除此验证器文件。

使用Devise为电子邮件编写Rails验证的简单方法

更简单的< code >验证:email，:presence =