Question

I have a class/table named “Comment”

<class name="Comment">
<id name="Id">
  <generator class="guid"/>
</id>
<property name="ReferenceId" index="Comment_ReferenceId_Index" />
<property name="Contents" length="1024" />

And I need to create a bag of comments on several other classes like Contract

<class name="Contract">
<id name="Id">
  <generator class="guid"/>
</id>
<property name="Status"/>    
<bag name="Comments">
  <key column="ReferenceId" />
  <one-to-many class="Comment" />
</bag>

Or Application:

<class name="Application">
<id name="Id">
  <generator class="guid"/>
</id>
<property name="Status" />
<bag name="Comments">
  <key column="ReferenceId" />
  <one-to-many class="Comment" />
</bag>

But this mapping give me only one foreign key, how can i create the collection to have comments on several classes?

Answer 1

The answer was:

Set the name of the foreign key to “none” and then hibernate don’t create the FK but tracks the references.

<class name="Contract">
<id name="Id">
  <generator class="guid" />
</id>
<property name="Status" />    
<bag name="Comments">
  <key column="ReferenceId" foreign-key="none"/>
  <one-to-many class="Comment" />
</bag>