Question

我有2个id存储在数据库中。我没有碰到'spec'文件夹。但仍localhost:3000/users/1显示此错误。

undefined method `name' for nil:NilClass
Extracted source (around line #1):
1: <%= @user.name %>, <%= @user.email %>

users_controller.rb

class UsersController < ApplicationController

  def show
    @user = User.find(params[:id])
  end

  def new
  end
end

show.html.erb

<%= @user.name %>, <%= @user.email %>

模特 - ＆gt; users.rb的

class User < ActiveRecord::Base
  attr_accessible :name, :email, :password, :password_confirmation
  has_secure_password

  before_save { |user| user.email = email.downcase }

  validates :name, presence: true, length: { maximum: 50 }
  VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
  validates :email, presence:   true,
                    format:     { with: VALID_EMAIL_REGEX },
                    uniqueness: { case_sensitive: false }
  validates :password, presence: true, length: { minimum: 6 }
  validates :password_confirmation, presence: true
end

Answer 1

编辑show.html.erb如下：

<%- if @user.present? %>
  <%= @user.name %>, <%= @user.email %>
<%end%>

由于@user为零而出现问题。所以你应该检查用户的对象是否为零。然后根据您的要求处理对象。

nil的未定义方法`name'：NilClass

1 个答案: