I have a class A containing a list of B mapped like that
<class name="A" table="CLASS_A">
...
<idbag name="ListOfB"
table="CLASS_A_CLASS_B"
cascade="save-update">
<collection-id column="ID" type="Guid"> <!-- surrogate key -->
<generator class="guid.comb"/>
</collection-id>
<key column="ID_A"/>
<many-to-many column="ID_B" class="B"/>
</idbag>
</class>
On the DB side, there's a many-to-many join CLASS_A_CLASS_B table
between CLASS_A & CLASS_B tables and it's got an ID surrogate key. The
many-to-many relation is not mapped in the object model of class B.
Initially, let's say I have object X1 and X2 in ListOfB. If I remove
X2 and insert X3, I noticed that NHibernate will do an update of the
foreign key pointing to X2 to make it point to X3.
This is a fine optimization.
For my purpose however, I would like to trick NHibernate into doing a
delete followed by a new insertion in the M2M join table (delete row
for X2, insert new row for X3). I want that since these tables are
replicated to another instance of our application and we show a diff
of insert/update/delete to the user.
In this particular case, the use case is really "I removed X2 and
added X3", so I'd like the diff the show that fact (instead of an
update). I understand this behavior is suboptimal but it does not
matter in this case.
Any way to trick NHibernate into doing that ?
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