Question

I have two objects (class, student) in a database with a many to many relationship (using a simple junction table). I’ve figured out how to correctly add new objects to tables, and now I’d like to delete an object.

I’ve been trying the following:

// (a classobj with id==1 does exist)
ClassObj cl = (from c in entities.ClassObjs where c.ClassID == 1 select c).First();
entities.ClassObjs.DeleteObject(cl);
entities.SaveChanges();

Which gives the error:

"The DELETE statement conflicted with the REFERENCE constraint \"FK_JunctionClassObjsStudents_Students\".

Where JunctionClassObjsStudents is the name of the junction table which creates the many to many relationship between classes and students tables.

What do I need to do? Thanks for your help!!

Answer 1

One solution is to put a cascade (or SET NULL) on the FK and then regenerate your entity model.