How can we execute custom method while Cascade="Delete" is being executed ?

Question

For example i have two entities. "RealEstate" and "Picture". RealEstate holds a collection of Picture. In the mapping file RealEstate has a bag in it for Pictures and cascade is Delete".

If you delete a RealEstate all the related Pictures will be deleted. But is there any way to execute a custom method to delete the pictures from the web server.

I did it by assigning cascade="none" and when i delete a RealEstate i first check is there any Pictures related to it, if there is, i call DeletePicture() method for it.

I am curious about what do you do in these kind of situations ?

Thanks

Answer 1

You could write an interceptor and implement the OnDelete method that will be executed when a picture is deleted.

Answer 2

If you're using nhibernate 2.0 , the new and better way to go is : use events.

Article about nhibernate 2.0 events