Question

I am doing a project which involves a good use of core data. I have been using it since few months now. I have a small problem. I have two different entities a entity named Student and another named Courses. The relationship between Student and Courses is one to many. I am frequently updating the entities from the remote json. So, sometimes there are dangling pointer in the Courses entity which do not have relationship to the Student entity. This type of the entities need to be deleted. How is it better to delete such objects ?

              Courses(points to student) <------------- Student ----------------> Course (Points to student) 
                                                           |
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                                                Course (Points to student)

                       Course(has no pointer to student, no foreign key to relate with student)

Answer 1

Are you sure you need to delete a course when it has no students? Course may be valid though. I think you should nullify the relations, so when you delete a student, all courses pointing to it just would stop referencing that student.

You probably need to check your relationship delete rules so that they should be nullify in my opinion.