Rails 3 NoMethod错误 - 配置文件中的配置文件未定义方法＃使用CanCan编辑

Question

在我的Rails 3应用程序中，我正在重定向以在注册过程中进行登录。要注册的步骤应该是：

1. 用户创建用户和简介
2. 在保存用户，用户登录到应用程序，并重定向到配置文件＃编辑（/signup/join）
3. 在保存配置文件，用户被重定向到配置文件＃秀（/profiles/:id）

我重新导向至/login步骤1后，和我看到重定向后302错误。如果我注释掉我在profiles_controller.rbbefore_filter :authenticate和重做上面，我不重定向出/signup/join步骤，但我得到以下错误：

NoMethodError in ProfilesController#edit 
undefined method `profile' for nil:NilClass 

我指了指我Profiles#edit行动的第一行：

def edit 
    @profile = user.profile 
    if @profile.higher_ed? 
    higher_ed = HigherEd.find_or_create_by_name(:name => @profile.higher_ed) 
    end 
    if @profile.employer? 
    employer = Employer.find_or_create_by_name(:name => @profile.employer) 
    end 
    render :layout => "join_form" 
end 

我一直试图在我的应用程序中实现CanCan，所以我认为这是原因。但是，我注释了我的整个ability.rb文件，问题依然存在。我很想弄清楚如何解决这个问题，而不用注释掉before_filter。所以如果有人有想法，我会非常感激。因为我负责的康康舞这取决于current_user，我会在我的application_controller.rb与current_user的定义开始：

protected 
    # Returns the currently logged in user or nil if there isn't one 
    def current_user 
    return unless session[:user_id] 
    @current_user ||= User.find_by_id(session[:user_id]) 
    @current_user ||= User.find_by_auth_token!(cookies[:auth_token]) if cookies[:auth_token] 
    end 

    # Make current_user available in templates as a helper 
    helper_method :current_user 

这里是我的users_controller.rb：

class UsersController < ApplicationController 
    before_filter :authenticate, :only => [:edit, :update, :index] 
    layout "application" 

    def new 
    @user = User.new 
    @user.profile = Profile.new 
    if logged_in? 
     redirect_to current_user.profile 
    end 
    end 

    def create 
    @user = User.new(params[:user]) 
    if @user.save 
     session[:user_id] = @user.id 
     redirect_to join_path, :notice => 'User successfully added.' 
     UserMailer.registration_confirmation(@user).deliver 
    else 
     render :action => 'new' 
    end 
    end 

我profiles_controller.rb：

class ProfilesController < ApplicationController 
    #before_filter :authenticate, :only => [:edit, :update] 
    helper_method :find_or_create_group 
    layout "application", :except => [:edit, :show] 

    def new 
    @profile = Profile.new(params[:profile]) 
    end 

    def create 
    @profile = Profile.new(params[:profile]) 
    if @profile.save 
     redirect_to @user.profile, :notice => 'User successfully added.' 
    else 
     render :new 
    end 
    if @profile.higher_ed? 
     HigherEd.find_or_create_by_name(:name => @profile.higher_ed) 
    end 
    if @profile.employer? 
     Employer.find_or_create_by_name(:name => @profile.employer) 
    end 
    if @profile.job_title? 
     JobTitle.find_or_create_by_name(:name => @profile.job_title) 
    end 
    if @profile.high_school? 
     HighSchool.find_or_create_by_name(:name => @profile.high_school) 
    end 
    end 

    def user 
    @user = current_user 
    end 

    def edit 
    @profile = user.profile 
    if @profile.higher_ed? 
     higher_ed = HigherEd.find_or_create_by_name(:name => @profile.higher_ed) 
    end 
    if @profile.employer? 
     employer = Employer.find_or_create_by_name(:name => @profile.employer) 
    end 
    render :layout => "join_form" 
    end 

我的sessions_controller.rb：

class SessionsController < ApplicationController 
    def new 
    end 

    def create 
    if user = User.authenticate(params[:email].downcase, params[:password]) 
     session[:user_id] = user.id 
     cookies.permanent[:auth_token] = user.auth_token 
     if user.profile.higher_ed? 
     redirect_to user.profile, :notice => "Logged in successfully" 
     else 
     redirect_to join_path, :notice => "Logged in successfully" 
     end 
    else 
     flash.now[:alert] = "Invalid login/password. Try again!" 
     render :action => 'new' 
    end 
    end 

    def destroy 
    reset_session 
    cookies.delete(:auth_token) 
    redirect_to root_path, :notice => "You successfully logged out" 
    end 
end 

我ability.rb的康康舞：

class Ability 
    include CanCan::Ability 

    def initialize(user) 
    user ||= User.new guest user 

    if user.role? :admin 
     can :manage, :all 
    else 
     can :manage, :all 
    end 
    end 
end 

我routes.rb：

match "/signup/join" => "profiles#edit", :as => 'join' 

Answer 1

我通过修改我的current_user逻辑得到了它的工作。现在是：

def current_user 
    @current_user ||= lookup_user 
end 

def lookup_user 
    if cookies[:auth_token] 
    User.find_by_auth_token!(cookies[:auth_token]) 
    elsif session[:user_id] 
    User.find_by_id(session[:user_id]) 
    end 
end 

这似乎已经做到了。

Answer 2

@profile = user.profile 

尝试改变上述行

@profile = @current_user.profile 

或

@profile = current_user.profile 

该问题与康康无关，而是与“用户”在您的控制器中为零有关。