Question

我的模特是：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，我该怎么办？我想删除与该作业相关的所有规格。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

如果要删除包含要删除的作业的所有专精，即使他们还有其他作业：

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

或者，您可能只想清除在删除此作业后不再有任何作业的所有专业化：

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

iOS领域级联删除

1 个答案: