Ruby On Rails登陆页面示例

如下图所示建立工程.

admin_controller.rb

class AdminController < ApplicationController def login unless request.get? username = params[:user][:username] password = params[:user][:password] @user = User.find(:all, :conditions => ["username = ? and password = ?", username, password]) unless @user.empty? session[:UserID]= @user[0].id redirect_to :controller => "menu",:action => "index" else render :text => '登陆失败！' end end endend

admin/index.html.erb

<%= form_tag :action => 'login' %>用户:<%= text_field :user, :username, :style => 'width:100' %><br/>密码:<%= password_field :user, :password, :style => 'width:100' %><br/><%= submit_tag "登陆" %></form>============================================================<% form_for :user, :url => {:action => 'login'} do |f|%> 用户:<%= f.text_field :username, :style => 'width:100' %><br/>密码:<%= f.password_field :password, :style => 'width:100' %><br/><%= submit_tag "登陆" %> <% end %>============================================================

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下面的代码在Rails2以后被移除了

<!-- start_form_tag removed from rails2
<%= start_form_tag :action => "login" %>
用户:<input name="user[username]" type="text" style="width:100" />
<br/>
密码:<input name="user[password]" type="password" style="width:100" />
<br/>
<input type="submit" value="登陆">
<%= end_form_tag %>

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menu_controller.rb

class MenuController < ApplicationController def index userid = session[:UserID] @user = User.find(:first, :conditions => [ "id = ?", userid]) endend

menu/index.html.erb

class MenuController < ApplicationController def index userid = session[:UserID] @user = User.find(:first, :conditions => [ "id = ?", userid]) endend

测试用MySQL数据库，users表：

CREATE TABLE `users` ( `id` int(11) NOT NULL AUTO_INCREMENT, `username` varchar(20) NOT NULL, `password` varchar(20) NOT NULL, PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=latin1;