form_for - 未定义的方法

时间:2014-04-07 16:01:06

标签: ruby ruby-on-rails-4 form-for

我尝试创建一个Sign_in-formular(link to tutorial),但是我收到以下错误代码:

  

在2014-04-07 17:50:54 +0200左右开始获取127.0.0.1的“/ user / sign_in”     ActiveRecord :: SchemaMigration Load(1.0ms)SELECT“schema_migrations”。* FROM“schema_migrations”
  由UserController#sign_in处理为HTML
    在布局/应用程序(19.0ms)内呈现user / sign_in.html.erb
  在92毫秒内完成500内部服务器错误

     

ActionView :: Template :: Error(表单中的第一个参数不能包含nil或为空):
      1:登录
      2:<%= form_for @user,:as => :user,:url => sign_in_path(@user)do | f | %GT;
      3:<%= f.label'用户名或电子邮件:'%>
      4:<%= f.text_field:username%>
    app / views / user / sign_in.html.erb:2:in`_app_views_user_sign_in_html_erb ___ 114454536_30263052'

此外,我添加了所有内容(我认为这是您需要了解的全部内容),它取决于错误代码。
如果您需要更多信息,请告诉我 如果我添加太多信息,请告诉我 之后我会编辑这篇文章。

型号:(user.rb)

class User < ActiveRecord::Base
  attr_accessible :email, :username, :password, :password_confirmation
  attr_accessor :password
  before_save :encrypt_password

  validates_confirmation_of :password
  validates_presence_of :password, :on => :create
  validates_presence_of :email, :on => :create
  validates_presence_of :username, :on => :create
  validates_uniqueness_of :email
  validates_uniqueness_of :username

  def self.authenticate_by_email(email, password)
    user = find_by_email(email)
    if user && user.password_hash == BCrypt::Engine.hash_secret(password, user.password_salt)
      user
    else
      nil
    end
  end

  def self.authenticate_by_username(username, password)
    user = find_by_username(username)
    if user && user.password_hash == BCrypt::Engine.hash_secret(password, user.password_salt)
      user
    else
      nil
    end
  end

  def encrypt_password
    if password.present?
      self.password_salt = BCrypt::Engine.generate_salt
      self.password_hash = BCrypt::Engine.hash_secret(password, password_salt)
    end
  end
end

控制器:(user_controller.rb)

class UserController < ApplicationController
  def sign_in
    @user = User.new
  end

  def login
    username_or_email = params[:user][:username]
    password = params[:user][:password]

    if username_or_email.rindex('@')
      email = username_or_email
      user = User.authenticate_by_email(email, password)
    else
      username = username_or_email
      user = User.authenticate_by_username(username, password)
    end

    if user
      flash[:notice] = 'Welcome'
      redirect_to :root
    else
      flash[:error] = 'Unknown user. Please check your username and password.'
      render :action => "sign_in"
    end
  end

  def change_pw
  end

  def forgot_pw
  end

  def new
  end

  def sent_pw
  end

  def sign_in
  end

  def signed_out
  end
end

查看:(sign_in.html.erb)

<p>Sign In</p>
<%= form_for @user, :as => :user, :url => sign_in_path(@user) do |f| %>
    <p>
      <%= f.label 'username or email:' %><br />
      <%= f.text_field :username %>
    </p>
    <p>
      <%= f.label 'password:' %><br />
      <%= f.password_field :password %>
    </p>
    <p>
      <%= f.submit 'Sign In' %>&nbsp;&nbsp;&nbsp;
      <%= f.submit 'Clear Form', :type => 'reset' %>
    </p>
<% end %>

路线(routes.rb)

Calendar::Application.routes.draw do
  root "welcome#index"

  get "user/change_pw"
  get "user/forgot_pw"
  get "user/new"
  get "user/sent_pw"
  get "user/sign_in"
  get "user/signed_out"
  get "welcome/index"

  post "sign_in" => "user#login" #ein HTTP post auf der Seite sign_in führt die Methode login im user controller aus
end

1 个答案:

答案 0 :(得分:2)

您已在sign_in中定义了两次UserController方法。从UserController的底部删除sign_in的第二个定义(空方法)。

如您所见,您已重新定义了方法sign_in,因此Ruby会选择最新的评估方法定义,而您没有设置@user。因此,错误。