ios - 保存 Realm 对象时应用程序崩溃... RLMAccessor 将对象设置为 nil

Question

每当我保存 Realm 对象时，我都会崩溃，崩溃点指向类型为 SaleItemVariation 的属性，该属性从 RLMAccessor.mm 设置为 nil。

if (_promote_existing && [obj isKindOfClass:_info.rlmObjectSchema.objectClass] && !prop.swiftIvar) {
        // set the ivars for object and array properties to nil as otherwise the
        // accessors retain objects that are no longer accessible via the properties
        // this is mainly an issue when the object graph being added has cycles,
        // as it's not obvious that the user has to set the *ivars* to nil to
        // avoid leaking memory
        if (prop.type == RLMPropertyTypeObject) {
            ((void(*)(id, SEL, id))objc_msgSend)(obj, prop.setterSel, nil);
        }
    }

我的类(class):

final class SaleItem: Object, Mappable{
    .....
    @objc dynamic var variation: SaleItemVariation! 
    ......

    var singleQuantityPrice: Double {
        return variation.price // Crash here, Fatal error: Unexpectedly found nil while unwrapping an Optional value 
    }   
}

class SaleItemVariation: Object, Mappable{
          @objc dynamic var price: Double = 0
  }

我不知道为什么会这样？

注意:Realm 版本为 2.10.2

Answer 1

保存 Realm 对象必须在 Realm block 内。

try? realm.write {
  //realm add
  //realm update
  //realm delete
}