[Hibernate-issues] [Hibernate-JIRA] Updated: (HB-243) Polymorphic associations are not handled properly

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

The following issue has been updated:

    Updater: Gavin King (mailto:ga...@in...)
       Date: Sun, 10 Aug 2003 9:01 AM
    Comment:
This is not a bug, it is a missing (?) feature from the hbm2java tool.

It would be implemented as a <meta name="property-type">com.hp.Printer</meta>
    Changes:
             type changed from Bug
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  http://opensource.atlassian.com/projects/hibernate/secure/ViewIssue.jspa?key=HB-243&page=history

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View the issue:

  http://opensource.atlassian.com/projects/hibernate/secure/ViewIssue.jspa?key=HB-243


Here is an overview of the issue:
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        Key: HB-243
    Summary: Polymorphic associations are not handled properly
       Type: Improvement

     Status: Unassigned
   Priority: Major

    Project: Hibernate2
 Components: 
             toolset
   Versions:
             2.0 final

   Assignee: 
   Reporter: abe zafar

    Created: Sun, 10 Aug 2003 2:54 AM
    Updated: Sun, 10 Aug 2003 9:01 AM
Environment: JDK1.4

Description:
If I have an association like this one:

<many-to-one classname="com.hp.Printer"/>

and Printer does not have a mapping but it is an interface for a class called com.hp.ColorPrinter that does have a mapping, I would get two methods generated as I would expect:

public void setPrinter( Printer printer ) {
  ...
}

public Printer getPrinter() {
  ...
}

But since "com.hp.Printer" was never mapped I would get a rutime exception saying cannot find the mapping. If through some other tag or the <many-to-one> tag itself I can indicate that use the interface type for code generation but use the implementation class to look for the mapping the problem would be solved. For example if we had something like this:

<many-to-one compile-time-class="com.hp.Printer" run-time-class="com.hp.ColorPrinter"/> then the setter and getter would be generated using the compile-time-class and the run-time-class would be used to look up the mapping at runtime.



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