What is Core Data inverse relationship?

Inverse relationships enable Core Data to propagate change in both directions when an instance of either the source or destination type changes. Every relationship must have an inverse. When creating relationships in the Graph editor, you add inverse relationships between entities in a single step.

What is delete rule in Core Data?

A delete rule defines what happens when the record that owns the relationship is deleted. A delete rule defines what happens when the record that owns the relationship is deleted. Select the notes relationship of the Category entity and open the Data Model Inspector on the right.

How is a relationship created in core data?

Core Data creates this relationship for us. If a relationship has an inverse relationship, then Core Data takes care of this automatically. You can verify this by asking newAddress for its persons. Updating a relationship isn’t difficult either.

How are managed objects related to core data?

Put another way, there is a to-one relationship between a managed object and the data record it represents, but a to-many relationship between the record and corresponding managed objects. Core Data does not let you create relationships that cross stores.

Why does core data use relationship’s delete rule?

Core Data uses this information to ensure the consistency of the object graph if a change is made (see Manipulating Relationships and Object Graph Integrity ). A relationship’s delete rule specifies what should happen if an attempt is made to delete the source object. Note the phrasing if an attempt is made.

Which is more complex candy or coredataproperties?

Candy+CoreDataProperties.swift will be pretty much exactly what you expect, although notice how origin is now a Country. Country+CoreDataProperties.swift is more complex, because Xcode also generated some methods for us to use.