Hi all,
I've been using Castor for some time to map a complex set of objects
but I've stumbled across
a problem with a many-many relation. The problem I have is that when I
create a new "Movie" object
and I add a "Videoformats" to it, Castor does not add the entry in the
relation table "videoformat_list".
When I remove the condition tx.isPersistant in ClassMolder
(org.exolab.castor.persist.ClassMolder:915),
the entry is added but when I try loading a "Movie" back, I get this
exception:
--
org.exolab.castor.jdo.PersistenceException: Object, Title@7ca8, links to
another object, Movie@7808b9 that is not loaded/updated/created in this
transaction
--
I don't really understand what that means and how to make this m-n
relation work.
The mapping is:
<mapping>
<!-- class declaration for Category here -->
<class identity="uid" name="Videoformats">
<description>Describes a videoformat</description>
<map-to table="videoformats"/>
<field name="uid" type="integer">
<description>Primary Key</description>
<sql name="uid" type="integer"/>
</field>
<field name="videoformatDescription" type="VideoformatDescription"
collection="vector" required="true">
<description></description>
<sql many-key="videoformat"/>
</field>
</class>
<class identity="lang content" name="VideoformatDescription">
<description></description>
<map-to table="videoformats_desc"/>
<field name="lang" type="java.lang.String">
<sql name="lang" type="varchar"/>
</field>
<field name="content" type="java.lang.String">
<sql name="description" type="varchar"/>
</field>
</class>
<class identity="uid" name="Movie" key-generator="uidgen">
<map-to table="movies"/>
<!-- some removed for sake of brievety -->
<field name="uid" type="java.lang.String">
<description>Primary Key for Titles table</description>
<sql name="uid" type="integer"/>
</field>
<!-- ********************** 1-N relation, works fine
********************************** -->
<field name="category" type="com.dvdsoon.ebeans.title.Category"
required="true">
<description>The category of this movie</description>
<sql name="category"/>
</field>
<!--
*********************************************************************************
-->
<!-- *********************** M-N relation, that's the
trouble************************* -->
<field name="videoformats"
type="com.dvdsoon.ebeans.title.Videoformats" collection="vector"
required="true">
<description>Videoformats of this movie</description>
<sql many-table="videoformat_list" many-key="movie"
name="videoformat"/>
</field>
<!--
**********************************************************************************
-->
<field name="version" type="integer">
<description>The version number of this entry</description>
<sql name="version_number" type="integer"/>
</field>
</class>
</mapping>
Thank you in advance for your time..
S�bastien Dumais
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