iOS Realm 级联删除

Question

我的模型是:
第一个模型 - Job: idx, title, description
第二个模型 - Specialization: idx, title, RLMArray<Job> jobs
如果我想删除作业并且我想删除与作业相关的所有规范，我应该怎么做。提前谢谢你。
我的代码是:

[self.storage beginWriteTransaction];
RLMResults *specs = [MBSpecialization objectsInRealm:self.storage where:@"%@ IN jobs", job];
                for (MBSpecialization *spec in specs) {
                    [self.storage deleteObjects:spec];
                }
[self.storage deleteObject:job];
[self.storage commitWriteTransaction];

Answer 1

如果您想删除所有包含被删除作业的特化，即使它们还有其他作业:

[self.storage beginWriteTransaction];
[self.storage deleteObjects:[job linkingObjectsOfClass:MBSpecialization.className forProperty:@"jobs"]];
[self.storage deleteObject:job];
[self.storage commitWriteTransaction];

或者，您可能只想清理所有在删除后不再有任何工作的专业:

[self.storage beginWriteTransaction];
[self.storage deleteObject:job];
[self.storage deleteObjects:[MBSpecialization objectsInRealm:self.storage where:@"jobs.@count = 0"]];
[self.storage commitWriteTransaction];