[Hibernate-issues] [Hibernate-JIRA] Closed: (HB-175) One-to-many association does not correctly discriminate when a subclass is specified

[<leg...@at...>]

Message:

   The following issue has been closed.

   Resolver: Gavin King
       Date: Sat, 12 Jul 2003 12:55 AM

This is intended functionality (for performance we don't include the discriminator). You can force the behaviour you desire by adding a where attribute the the collection mapping.
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View the issue:

  http://opensource.atlassian.com/projects/hibernate/secure/ViewIssue.jspa?key=HB-175


Here is an overview of the issue:
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        Key: HB-175
    Summary: One-to-many association does not correctly discriminate when a subclass is specified
       Type: Bug

     Status: Closed
   Priority: Major
 Resolution: REJECTED

    Project: Hibernate2
 Components: 
             core
   Versions:
             2.0.1

   Assignee: 
   Reporter: Peachawat Peachavanish

    Created: Thu, 10 Jul 2003 1:49 PM
    Updated: Sat, 12 Jul 2003 12:55 AM
Environment: Gentoo Linux, Sun Java 1.4.1

Description:
When using one-to-many association from 'Parent' to 'SubChild_1' and 'SubChild_2' where 'SubChild_1' and 'SubChild_2' are subclasses of 'Child', the generated SQL for hydrating a 'Parent' does not appropriate include 'where' clause to discriminate 'SubChild_1' or 'SubChild_2'.

Class Declaration
=================
'Child.java'
public abstract class Child{}

'SubChild_1.java'
public class SubChild_1 extends Child {}

'SubChild_2.java'
public class SubChild_2 extends Child {}

'Parent.java'
public class Parent {
  private List subChilds_1 = new ArrayList();
  private List subChilds_2 = new ArrayList();
}

Mapping
=======
'Child.hbm.xml'
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
  "-//Hibernate/Hibernate Mapping DTD 2.0//EN"
  "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>
  <class name="Child" discriminator-value="_">
    <id name="id">
      <generator class="native"/>
    </id>
    <discriminator column="CHILDTYPE"/>
    <property name="aProperty"/>
    <subclass name="SubChild_1" discriminator-value="1"/>
    <subclass name="SubChild_2" discriminator-value="2"/>
  </class>
</hibernate-mapping>

'Parent.hmb.xml'
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
  "-//Hibernate/Hibernate Mapping DTD 2.0//EN"
  "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>
  <class name="Parent">
    <id name="id">
      <generator class="native"/>
    </id>
    <property name="aProperty"/>
    <list name="subChilds_1" lazy="false" cascade="all">
      <key column="parent_id"/>
      <index column="idx"/>
      <one-to-many class="SubChild_1"/>
    </list>
    <list name="subChilds_2" lazy="false" cascade="all">
      <key column="parent_id"/>
      <index column="idx"/>
      <one-to-many class="SubChild_2"/>
    </list>
  </class>
</hibernate-mapping>

Generated SQL when perform session.find()
=========================================
Hibernate: select child0_.id as id__, child0_.idx as idx__, child0_.id as id from Child child0_ where child0_.parent_id=?

There is no 'where CHILDTYPE=?' discriminating clause.


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