在Rails里使用ReCaptcha添加验证码

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1，去 http://recaptcha.net/sign up，获得pub key和priv key
2，安装recaptcha gem

gem install --source http://www.loonsoft.com/recaptcha/pkg/ recaptcha

3，在environment.rb里设置key

require 'recaptcha'
RCC_PUB = 'pub key'
RCC_PRIV = 'priv key'

4，修改application.rb

class ApplicationController < ActionController::Base
  include ReCaptcha::AppHelper

5，修改application_helper.rb

module ApplicationHelper
  include ReCaptcha::ViewHelper

6，在页面上显示ReCaptcha验证码

<%= get_captcha %>

7，在Controller里验证验证码

if validate_recap(params, @comment.errors) && @comment.save
  flash[:notice] = 'Comment was successfully created.'
  format.html { redirect_to post_path(@comment.post.url_slug) }
  format.xml  { render :xml => @comment, :status => :created, :location => @comment }

看了下recaptcha源码，对于本地访问时validate_recap始终为true，对于错误的域名也始终为true

最终的样子：