登录function无效

我已经构建了一个应用程序，允许用户注册，登录和注销（我自己的设计，如果你愿意的话）。

该应用程序允许用户注册，但在尝试登录时，我收到以下错误：

//（不用说，我已经站稳了，谁能想到这个就是他们自己的天才）

SessionsController中的NoMethodError #create

undefined method `-' for nil:NilClass Rails.root: /Users/user/Sites/rails_projects/sample_app1 app/controllers/sessions_controller.rb:11:in `create' 

请求

参数：

 {"utf8"=>"✓", "authenticity_token"=>"/SEaqnrMf5X0pd4FVWbu8uWVAjTNw4LPKiXg+8Hl0PQ=", "session"=>{"email"=>"[e-mail]", "password"=>"[FILTERED]"}, "commit"=>"Sign in"} 

这是我的Session_Controller内容：

 class SessionsController < ApplicationController def new @title = "Sign in" end def create user = User.authenticate(params[:session][:email], params[:session][:password]) if user.nil? flash.now[:error] = "Invalid email/password combination." @title - "Sign In" render 'new' else sign_in user redirect_to user end end def destroy sign_out redirect_to root_path end end 

Users_Controller内容

 class UsersController  {:success => "Welcome to the Fun House!"} else @title = "Sign up" render 'new' end end end 

Sessions_helper内容

 module SessionsHelper def sign_in(user) cookies.permanent.signed[:remember_token] = [user.id, user.salt] current_user = user end def current_user=(user) @current_user = user end def current_user @current_user ||= user_from_remember_token end def signed_in? !current_user.nil? end def sign_out cookies.delete(:remember_token) self.current_user = nil end private def user_from_remember_token User.authenticate_with_salt(*remember_token) end def remember_token cookies.signed[:remember_token] || [nil, nil] end end 

最后Users_helper内容：

 module UsersHelper def gravatar_for(user, options = { :size => 50}) gravatar_image_tag(user.email.downcase, :alt => user.name, :class => 'gravatar', :gravatar => options) end end 

Answer 1

我想这一行：

 @title - "Sign In" 

应该是这样的：

 @title = "Sign In"