Adobe发布了Rails与Flex集成方案:
[url=http://code.google.com/p/rubyonrails-ria-sdk-by-adobe/]rubyonrails-ria-sdk-by-adobe[/url]

其中对Flex和Rails集成给出了几个例子，这里来与大家分享下最简单的xml交互方式
这种方式对后台服务端语言实际上没有限制，是最independent的

首先建立一个TopicsController:
[code]
class TopicsController < ApplicationController

def list
@topics = Topic.find(:all)
render : xml => @topics.to_xml
end

def create
@topic = Topic.new(params[:topic])
@topic.save
render : xml => @topic.to_xml
end

def update
@topic = Topic.find(params[:id])
@topic.update_attributes(params[:topic])
render : xml => @topic.to_xml
end

def delete
@topic = Topic.find(params[:id])
@topic.destroy
render : xml => @topic.to_xml
end

end
[/code]
这里我们的每个action都返回对象或对象数组的xml格式
比较郁闷的是每个方法最后都必须render一个:xml，否则ActionScript会报Error #2032 Stream Error，但是不影响操作结果

然后创建一个test.mxml:
[code]
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="listTopics.send()">
<mx:Script>
<![CDATA[
private function clearForm():void
{
title.text = ""
content.text = "";
}
private function sendTopicUpdate():void
{
var topic:Object = new Object();
topic['id'] = topic_list.selectedItem.id;
topic['topic[' + 'title' +']'] = title.text;
topic['topic[' + 'content' +']'] = content.text;

updateTopic.send(topic);
}
]]>
</mx:Script>
<mx:HTTPService id="listTopics" url="http://localhost:3000/topics/list" method="POST"/>
<mx:HTTPService id="updateTopic" url="http://localhost:3000/topics/update" method="POST" result="listTopics.send()"/>
<mx:HTTPService id="deleteTopic" url="http://localhost:3000/topics/delete" method="POST" result="listTopics.send()"/>
<mx:HTTPService id="createTopic" url="http://localhost:3000/topics/create" method="POST" result="listTopics.send()" contentType="application/xml">
<mx:request xmlns="">
<topic>
<title>{title.text}</title>
<content>{content.text}</content>
</topic>
</mx:request>
</mx:HTTPService>

<mx:VDividedBox x="0" y="0" height="100%" width="100%">
<mx:Panel width="100%" height="222" layout="absolute" title="Create/Update Topics">
<mx:Form x="10" y="10" width="930" height="100">
<mx:FormItem label="Title">
<mx:TextInput width="220" id="title" text="{topic_list.selectedItem.title}"/>
</mx:FormItem>
<mx:FormItem label="Content">
<mx:TextInput width="220" id="content" text="{topic_list.selectedItem.content}"/>
</mx:FormItem>
</mx:Form>
<mx:ControlBar horizontalAlign="right">
<mx:Button label="Clear" click="clearForm()"/>
<mx:Button label="Update" click="sendTopicUpdate(); clearForm()"/>
<mx:Button label="Create" click="createTopic.send(); clearForm()"/>
</mx:ControlBar>
</mx:Panel>
<mx:Panel width="100%" height="100" layout="absolute" title="Topics">
<mx:DataGrid x="0" y="0" width="100%" height="100%" id="topic_list" dataProvider="{listTopics.lastResult.topics.topic}">
<mx:columns>
<mx:DataGridColumn headerText="ID" dataField="id"/>
<mx:DataGridColumn headerText="Title" dataField="title"/>
<mx:DataGridColumn headerText="Content" dataField="content"/>
</mx:columns>
</mx:DataGrid>
<mx:ControlBar horizontalAlign="right">
<mx:Button label="Delete" click="deleteTopic.send({id:topic_list.selectedItem.id})"/>
</mx:ControlBar>
</mx:Panel>
</mx:VDividedBox>

</mx:Application>
[/code]
<mx:HTTPService/>标签指定我们要访问的url即可，其中可以设置result钩子方法
result钩子方法让CUD操作后更新Topics列表
Clear、Update、Create和Delete这四个Button的click事件分别指定做清除表单、UCD操作
而creationComplete="listTopics.send()"以及上面的result钩子方法则做R操作