RoR - SessionsController中的ArgumentError＃创建错误的参数数量（1表示2）

Question

我是RoR的新手，我正在按照本教程从头开始创建用户身份验证系统： http ： //railscasts.com/episodes/250-authentication-from-scratch 。 我整个周末都被这个错误消息挂断了：

ArgumentError in SessionsController#create: wrong number of arguments (1 for 2). 

这是我的会话控制器的代码：

class SessionsController < ApplicationController
  def new
  end

  def create
    user = User.authenticate(:email => params[:email], :password => params[:password])
    if user
        session[:user_id] = user.id
        redirect_to root_url, :notice => "Logged in!"
    else
        flash.now.alert = "Invalid email or password"
        render "new"
    end
  end
end

这是来自我的user.rb模型的代码（错误消息在第10行提供了一个提取的源= = def self.authenticate (email, password)

class User < ActiveRecord::Base

attr_accessor :password
validates_confirmation_of :password
validates_presence_of :email
validates_uniqueness_of :email
validates_presence_of :password, :on => :create # needed to move line up from below to. Cannot encrypt password without validating password
before_save :encrypt_password

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

结束

Answer 1

模型中的authenticate方法有两个参数，但是你只传递一个（带有两个键的哈希）。 将其更改为：

User.authenticate(params[:email], params[:password])

Answer 2

问题出在这一行：

user = User.authenticate(:email => params[:email], :password => params[:password])

它应该是

user = User.authenticate(params[:email], params[:password])