add mutable attribute to subclass and joined-subclass elements
--------------------------------------------------------------
Key: HHH-1922
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1922
Project: Hibernate3
Type: New Feature
Reporter: Joe Kelly
Can you please add the "mutable" attribute to the "subclass" and "joined-subclass" elements? It is currently only supported for the "class" element. Sometimes I want some subclasses to be mutable and others to be immutable, in the same hierarchy. For example, this is what I would like to be able to do:
----------------------
<class name="AbstractAccount" table="account" discriminator-value="null">
<id name="entityId" column="account_id" unsaved-value="null">
<generator class="sequence">
<param name="sequence">account_seq</param>
</generator>
</id>
<discriminator column="account_type" type="string"/>
<property name="name" column="name"/>
<subclass name="SystemDefinedAccount" discriminator-value="S" mutable="false">
</subclass>
<subclass name="UserDefinedAccount" discriminator-value="U" mutable="true">
</subclass>
</class>
----------------------
As you can see, SystemDefinedAccount is immutable whereas UserDefinedAccount is mutable.
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