Ruby实践—用户登录

开发环境

Ruby:Ruby1.9.1

Rails:Rails2.3.5

Mysql:Mysql5.0.9

Driver:mysql-2.8.1-x86-mingw32.gem

IDE:Rubymine2.0.1

一、创建View/login

在View/login下创建login.html.erb、index.html.erb、loginFail.html.erb

login.html.erb代码如下：

<h1>Welcome to login!</h1>
<% form_tag do %>
 <table>
      <tr>
         <td>User name:</td>
         <td><%= text_field("user", "username") %></td>
     </tr>
     <tr>
         <td>Password:</td>
         <td><%= password_field("user", "hashed_password") %></td>
     </tr>
     <tr>
         <td></td>
         <td><input type="submit" value=" login " /> <input type="reset" value=" reset " /></td>
     </tr>
   </table>
<% end %>

index.html.erb代码如下：

<h1>Choose a page to look!</h1> <p><%= link_to 'Users', :controller=>"users",:action=>"index" %></p> <p><%=

link_to 'Products', :controller=>"products",:action=>"index"%></p>
<p><%= link_to 'Logout', :action=>"login"%></p>

loginFail.html.erb

<h1>Invalid user/password combination</h1>
<%form_tag do%>
     <%= link_to 'Back', :action=>"login" %>
<%end%>

二、创建login_contoller.rb

代码如下：

class LoginController < ApplicationController
  def login
     if request.get?
      session[:user_id] = nil
      @user = User.new
     else
      @user = User.new(params[:user])
      logged_in_user = @user.try_to_login

      if logged_in_user
         session[:user_id] = logged_in_user.id
         redirect_to(:action => "index")
      else
        # flash[:notice] = "Invalid user/password combination"
        redirect_to(:action => "loginFail")
      end
    end
  end

  def loginFail
    
  end
  #清空登录信息
  def reset
    params[:user]["username"]=null
    params[:user]["hashed_password"]=null
  end
end

三、修改user.rb

添加登录信息验证内容

def self.login(username, hashed_password)
    password = hash_password(hashed_password || "")
    find(:first,
    :conditions => ["username = ? and password = ?",username, password])
  end

  def try_to_login
    User.login(self.username, self.hashed_password)
  end

四、修改routes.rb

添加login映射规则

map.connect '/login/login',:controller=>"login",:action=>"login"

五、修改view/user/index.html.erb及view/product/index.html.erb

添加如下链接

<%= link_to 'Logout', :controller=>"login",:action=>"login" %>
<%= link_to 'Back to List', :controller=>"login",:action=>"index" %>

演示效果：