Mike Zhu1,840 Points
What is the inverse relationship in Core Data?
I am new to Core Data in iOS. I would like to know the difference between "inverse" relationship and "No inverse" relationship between difference entities.
Greg KalekaTreehouse Moderator 38,167 Points
This is a concept that doesn't only apply to CoreData, but rather extends to databases in general. Essentially, the difference is that "inverse" relationships are ones that go in both directions. For example a teacher has many students, and each student has that teacher.
A unidirectional relationship (or "no inverse" as you put it) is one that goes only one way. It's harder to come up with an easy to grasp example, and it's generally not a good idea to model your data this way, since you will end up with a lot of potential issues you'll need to keep track of.
Check out more details in the docs I linked to above.