我是RoR的新手。我一直在关注我必须生成脚手架用户first_name last_name的教程,然后迁移到DB。出于某种原因,当我试图推送到Git中的新分支时,一些更改已丢失。然后我无法加载本地服务器,收到与DB相关的错误。经过长时间试图弄清楚出了什么问题,我放弃了,决定销毁并重新迁移数据库。
我已经尝试生成脚手架用户first_name last_name,但是控制台给了我一个错误:
The name 'User' is either already used in your application or reserved by Ruby on Rails. Please choose an alternative and run this generator again.
虽然索引页面看起来不错,但我可以正常创建用户并登录/注销,当我尝试访问http://localhost:3000/users/时,我收到此错误:
NoMethodError in Users#index
Showing /Users/Jen/nameofapp/app/views/users/index.html.erb where line #16 raised:
undefined method `first_name' for # User:0x007febdf5938a0
这些是我的代码段:
视图/用户/ index.html.erb
<p id="notice"><%= notice %></p>
<h1>Listing Users</h1>
<table>
<thead>
<tr>
<th>First name</th>
<th>Last name</th>
<th colspan="3"></th>
</tr>
</thead>
<tbody>
<% @users.each do |user| %>
<tr>
<td><%= user.first_name %></td>
<td><%= user.last_name %></td>
<td><%= link_to 'Show', user , class:"btn btn-default btn-xs" %></td>
<td><%= link_to ('<span class="glyphicon glyphicon-pencil"></span>').html_safe, edit_user_path(user) %></td>
<td><%= link_to ('<span class="glyphicon glyphicon-remove"></span>').html_safe, user, method: :delete, data: { confirm: 'Are you sure?' } %></td>
</tr>
<% end %>
</tbody>
</table>
<br>
<div class="col-sm-6 col-md-4">
<%= link_to 'New User', new_user_path, class:"btn btn-default btn-xs" %>
</div>
模型/ user.rb
class User < ApplicationRecord
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
has_many :orders
end
控制器/ users_controller.rb
class UsersController < ApplicationController
before_filter :authenticate_user!, :except => [:show, :index]
before_action :set_user, only: [:show, :edit, :update, :destroy]
load_and_authorize_resource
# GET /users
# GET /users.json
def index
@users = User.all
end
# GET /users/1
# GET /users/1.json
def show
end
# GET /users/new
def new
@user = User.new
end
# GET /users/1/edit
def edit
end
# POST /users
# POST /users.json
def create
@user = User.new(user_params)
respond_to do |format|
if @user.save
format.html { redirect_to @user, notice: 'User was successfully created.' }
format.json { render :show, status: :created, location: @user }
else
format.html { render :new }
format.json { render json: @user.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /users/1
# PATCH/PUT /users/1.json
def update
respond_to do |format|
if @user.update(user_params)
format.html { redirect_to @user, notice: 'User was successfully updated.' }
format.json { render :show, status: :ok, location: @user }
else
format.html { render :edit }
format.json { render json: @user.errors, status: :unprocessable_entity }
end
end
end
# DELETE /users/1
# DELETE /users/1.json
def destroy
@user.destroy
respond_to do |format|
format.html { redirect_to users_url, notice: 'User was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_user
@user = User.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def user_params
params.require(:user).permit(:first_name, :last_name)
end
end
答案 0 :(得分:1)
如果您已将scaffold
用于Devise
课程,则可以使用User
。但是,您可以创建另一个迁移文件以将这些列添加到users
表
rails g migration AddFieldsToUser
然后在迁移中
def change
add_column :users, :first_name, :string
add_column :users, :last_name, :string
end
由于你是新手,我正在编写这些代码片段。