2008-06-25

Compass的SearchableReference

Class Entry
@Searchable(alias="entry")
{
@SearchableId
String id...}
@Searchable(alias="comment")
Class Comment
{@SearchableId
String id
...
@SearchableReference(refAlias="entry")
private Entry entry;
}

如上，按照我的理解，当检索到一个Comment对象时，Compass会把这条Comment对应的Entry也取出来。因为在SearchableReference的doc中有这么一句
引用
A searchable reference is a class field/property that reference another class, and the relationship need to be stored by Compass so it can be traversed when getting the class from the index.

然而，当我用Compass为数据库建立索引时，收到一个异常
引用
cannot marshall a null id


但是通过cpm.xml文件配置，建立索引，检索都没有问题，配置文件如下，难道被我发现了一个bug? 
//Entry.cpm.xml
<?xml version="1.0"?>
<!DOCTYPE compass-core-mapping PUBLIC
    "-//Compass/Compass Core Mapping DTD 1.0//EN"
    "http://www.opensymphony.com/compass/dtd/compass-core-mapping.dtd">

<compass-core-mapping package="xxx.xxx.pojos">
	<class name="Entry" alias="entry">
		<id name="id" />
                ...
		<property name="title">
			<meta-data>title</meta-data>
		</property>
		<property name="content">
			<meta-data>content</meta-data>
		</property>
	</class>
</compass-core-mapping>



//Comment.cpm.xml
<?xml version="1.0"?>
<!DOCTYPE compass-core-mapping PUBLIC
    "-//Compass/Compass Core Mapping DTD 1.0//EN"
    "http://www.opensymphony.com/compass/dtd/compass-core-mapping.dtd">

<compass-core-mapping package="com.gln.bloger.pojos">
	<class name="Comment" alias="comment">
		<id name="id" />
                  ...
		<property name="content">
			<meta-data>content</meta-data>
		</property>

        <reference name="entry"/>
	</class>
</compass-core-mapping>
评论
NicholasBugs 2008-06-30   回复
晕，搜问题搜到自己这里了。。。
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