[ http://jira.andromda.org/browse/HIB-204?page=comments#action_15540 ] 

Greg George commented on HIB-204:
---------------------------------

You may also want to always specify force="true" when you make a change here, 
due to (in my opinion) the hibernate bug 
http://opensource.atlassian.com/projects/hibernate/browse/HHH-219

When traversing down associations to subclasses using a discriminator, 
hibernate does not use the discriminator by default in the query with this 
force option.


> Manage formulas as discriminators
> ---------------------------------
>
>          Key: HIB-204
>          URL: http://jira.andromda.org/browse/HIB-204
>      Project: Hibernate Cartridge
>         Type: New Feature

>     Reporter: Franco Caponi
>     Assignee: Wouter Zoons

>
> Hibernate documentation say that is possible using the formula attribute of 
> the discriminator tag, but AndroMDA doesn't implement this feature.
> From Hibernate documentation:
> [QUOTE]
> The <discriminator> element is required for polymorphic persistence using the 
> table-per-class-hierarchy mapping strategy and declares a discriminator 
> column of the table. The discriminator column contains marker values that 
> tell the persistence layer what subclass to instantiate for a particular row. 
> A restricted set of types may be used: string, character, integer, byte, 
> short, boolean, yes_no, true_false.
> <discriminator
>         column="discriminator_column"                      (1)
>         type="discriminator_type"                          (2)
>         force="true|false"                                 (3)
>         insert="true|false"                                (4)
>         formula="arbitrary sql expression"                 (5)
> />
> [/QUOTE]

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