inverse(forRelationshipKey:)
For a given key that defines the name of the relationship from the receiver’s class to another class, returns the name of the relationship from the other class to the receiver’s class.
Declaration
func inverse(forRelationshipKey relationshipKey: String) -> String?Parameters
- relationshipKey:
The name of the relationship from the receiver’s class to another class.
Return Value
The name of the relationship that is the inverse of the receiver’s relationship named relationshipKey.
Discussion
NSObject’s implementation of inverseForRelationshipKey: simply invokes [[self classDescription] inverseForRelationshipKey:relationshipKey]. To make use of the default implementation, you must therefore implement and register a suitable class description—see NSClassDescription.
For example, suppose an Employee class has a relationship named department to a Department class, and that Department has a relationship called employees to Employee. The statement:
employee inverseForRelationshipKey:@"department"];returns the string employees.