What is reverse Coredata?
Reverse relationships allow Core Data to propagate change in both directions when an instance of the source or target type changes. Every relationship must have an inverse. When creating relationships in the graph editor, you add inverse relationships between entities in one step.
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What is relationship in Coredata?
A relationship specifies the entity, or parent entity, of the objects in the target. This entity can be the same as the entity in the source (a reflexive relationship). One-to-one relationships are represented by a reference to the target object, and many relationships are represented by mutable sets.
Does every core data relation have to have an inverse?
There is generally no need for an inverse relationship. But there are some quirks/bugs in the basic data where you need an inverse relationship. There are cases where relationships/objects are missing, even though there is no error saving the context, if a reverse relationship is missing.
How can I change a relation in the basic data?
Open the Data Model Inspector in the Utilities panel on the right to view relationship details. In the Data Model Inspector, you can modify the relationship target and inverse relationship. You can also modify the relationship type or cardinality. Core Data supports To-One and To-Many relationships.
What are the deletion rules for core data?
Elimination rules for relationships affect relationships only from the source object to other objects (including reverses). Without potentially getting a large number of objects, possibly for no reason, there is no way for Core Data to efficiently clean up relationships to the object. Note that a Core Data object graph is directional.
What is the difference between basic data and basic data?
Basically, you’re checking to see if some other code (thread, process, or just a different managed object context) changed this object without your knowledge. Core Data does not perform this check on newly inserted objects because they could not have existed in any other scope.