NHibernate One-To-Many Delete Not Cascading?
Jan 21, 2011
I have a 'Photo' class and a 'Comment' class. An Photo can have multiple comments assigned to it.I have this configured as a one-to-many relationship within my HBM mapping file, and have set cascade="all-delete-orphan" against the 'Comments' bag within the Photo.hbm.xml mapping file.
However, if I try to delete a Photo which has 1 or more Comments associated with it, I am getting 'The DELETE statement conflicted with the REFERENCE constraint "FK_Comments_Photos"'
I tried a couple of other cascade options against the Comments bag in my Photo.hbm.xml but regardless of what I set it to, I'm getting the same outcome each time. I just want to be able to delete a Photo and have any associated comments automatically delete too.
Here is my Photo mapping (edited for brevity):
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" .... default-access="property" default-cascade="none" default-lazy="true">
<class xmlns="urn:nhibernate-mapping-2.2" name="Photo" table="Photos">
<id name="PhotoId" unsaved-value="0">[code]....
Here is my Comment mapping (edited for brevity):
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" ... default-access="property" default-cascade="none" default-lazy="true">
<class xmlns="urn:nhibernate-mapping-2.2" name="Comment" table="Comments">
<id name="CommentId" unsaved-value="0">[code]...
why the cascade is not happening when I try to delete a Photo with comments associated with it?
UPDATE: The only way I can get the cascade to happen is to configure the 'Delete Rule' within SQL Server against this relationship to 'Cascade', and in doing so means that I don't need to specify any cascade action within my NHibernate Mapping. However, this isn't ideal for me - I'd like to be able to configure the cascade behaviour within the NHibernate Mapping ideally, so I'm still confused as to why it doesn't appear to be taking any notice of my NHibernate cascade setting?
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I have the following mapping file for 'Photo' objects (edited for brevity):
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