ruby on rails-登录功能不起作用

Question

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

该应用程序允许用户注册，但当尝试登录时，我会收到以下错误：

//

SessionsController#create中的NoMethodError

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"} 

以下是我的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

用户_控制器内容

class UsersController < ApplicationController
def show
 @user = User.find(params[:id])
 @title = @user.name 
 end
def new
@user = User.new
@title = "Sign up"
end
def create
@user = User.new(params[:user])
if @user.save
sign_in @user
redirect_to @user, :flash =>  {:success => "Welcome to the Fun House!"}
else
@title = "Sign up"
 render 'new'
end
end
end

会话帮助程序内容

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

以及Last 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

我认为这一行：

@title - "Sign In"

应该是这样的：

@title = "Sign In"