这个问题似乎重复,但我已经检查了所有其他相关问题,并且没有一个答案适用,因为我已经尝试了所有这些。
我正在尝试创建用户注册表单。
我的用户模型(user.rb)是这样的。
class User < ApplicationRecord
attr_accessor :password
EMAIL_REGEX = /^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i
validates :username, :presence => true, :uniqueness => true, :length => { :in => 4..20 }
validates :email, :presence => true, :uniqueness => true, :format => EMAIL_REGEX
validates :password, :confirmation => true #password_confirmation attr
validates_length_of :password, :in => 6..20, :on => :create
end
用户控制器(users_controller.rb)就像这样
class UsersController < ApplicationController
def new
@user = User.new
end
def create
@user = User.new(user_params)
if @user.save
flash[:notice] = "You have signed up successdully"
flash[:color] = "valid"
else
flash[:notice] = "Invalid Input!"
flash[:color] = "invalid"
end
end
def user_params
params.require(:username).permit(:email, :password, :password_confirmation)
end
render "new"
end
用户新视图(new.html.erb)就是这样。
<% @page_title = "UserAuth | Signup" %>
<div class="Sign_Form">
<h1>Sign Up</h1>
<%= form_for(:user, :url => {:controller => 'users', :action => 'create'}) do |f| %>
<p> Username:</br> <%= f.text_field :username%> </p>
<p> Email:</br> <%= f.text_field :email%> </p>
<p> Password:</br> <%= f.password_field :password%></p>
<p> Password Confirmation:</br> <%= f.password_field :password_confirmation%> </p>
<%= f.submit :Signup %>
<% end %>
<% if @user.errors.any? %>
<ul class="Signup_Errors">
<% for message_error in @user.errors.full_messages %>
<li>* <%= message_error %></li>
<% end %>
</ul>
<% end %>
</div>
路线(routes.rb)就像这样
Rails.application.routes.draw do
get 'users/new'
resources :users
# For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
root 'home#index'
end
rake route给我以下输出。
Prefix Verb URI Pattern Controller#Action
users_new GET /users/new(.:format) users#new
users GET /users(.:format) users#index
POST /users(.:format) users#create
new_user GET /users/new(.:format) users#new
edit_user GET /users/:id/edit(.:format) users#edit
user GET /users/:id(.:format) users#show
PATCH /users/:id(.:format) users#update
PUT /users/:id(.:format) users#update
DELETE /users/:id(.:format) users#destroy
root GET / home#index
然而,当我尝试从浏览器访问http://localhost/users/new时,出现以下错误。
Showing C:/Sites/expenses/app/views/users/new.html.erb where line #11 raised:
undefined method `errors' for nil:NilClass
Extracted source (around line #11):
9
10
11
12
13
14
<%= f.submit :Signup %>
<% end %>
<% if @user.errors.any? %>
<ul class="Signup_Errors">
<% for message_error in @user.errors.full_messages %>
<li>* <%= message_error %></li>
答案 0 :(得分:1)
渲染新应该是创建时的错误。
这意味着,如果您在创建操作中有任何错误,@ user对象将与这些错误一起返回到新表单
因此,您可以使用@user.errors.any?
class UsersController < ApplicationController
def new
@user = User.new
end
def create
@user = User.new(user_params)
if @user.save
flash[:notice] = "You have signed up successdully"
flash[:color] = "valid"
else
flash[:notice] = "Invalid Input!"
flash[:color] = "invalid"
render "new"
end
end
def user_params
params.require(:username).permit(:email, :password, :password_confirmation)
end
end