rails3.1simple_captcha安装

1.安装simple_captcha插件

rails plugin install git://github.com/kares/simple_captcha.git
rails generate simple_captcha
rake db:migrate   

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2.配置，在config/initializers目录下添加simple_captcha.rb

SimpleCaptcha.backend = :rmagick  # default is :RMagick，如果安装的是rmagick插件，就写":rmagick"；或选用":quick_magick"
SimpleCaptcha.image_options =
?{
? ? :image_color => 'white',? ? :image_size => '110x30',? ? ?:text_color => 'black',? ? ?:text_font => 'arial',? ? ?:text_size => 22

? } # these are the defaults  设置验证码插件的风格和样式

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3.在config目录下routes.rb文件中添加下面代码：

match ":controller(/:action)",:controller => /simple_captcha/[^/]+/

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4.在app/controllers目录下,application_controller.rb文件中添加下面代码:

include SimpleCaptcha::ControllerValidation

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5.应用

(1)简单的引用

界面上：<%= show_simple_captcha %>

controller层：

if simple_captcha_valid?
? ? ?flash[:notice]="success"
?else
? ? ?flash[:notice]="error"
?end

(2)与某个model相关引用

model层添加：

class User < ActiveRecord::Base
? ? include SimpleCaptcha::ModelValidation
? ?validates_captcha : o n => :create,:message => 'invalid captcha'
end 

?界面上代码: <%= show_simple_captcha(:object=>"user") %>