Question

我正试图找出核心数据存在的问题。我理解错误意味着什么，我之前已经拥有它（并修复它），但我无法弄清楚为什么我现在得到它。

我的应用具有以下结构：

MPModel - ＆gt; MPPlace和MPModel - ＆gt; MPProject

其中MPModel是NSManagedObject的子类，MPPlace和MPProject是MPModel的子类。

数据模型与MPPlace和MPProject之间存在关系，其中MPPlace有许多MPProjects，而MPProject属于MPPlace。

当应用程序加载时，它会获取一些完美运行的MPPlace对象。当用户选择一个地点然后选择项目选项时，该应用程序会尝试检索项目列表。然而，这是app失败的地方，出现以下错误

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason:
'Failed to process pending changes before save.  The context is still dirty after 100 
attempts.  Typically this recursive dirtying is caused by a bad validation method, 
willSave, or notification handler.'

每个MPModel都包含许多自定义方法，包括saveAllLocally，它只是将对象数组保存到持久性存储中（如果它们尚不存在），loadNestedResources从服务器获取与当前对象相关的新对象。我发现loadNestedResources方法发生了故障，但我无法弄清楚原因。

loadNestedResources方法如下所示：

- (void) loadNestedResourcesOfType:(Class)type atURL:(NSString *)resURL withBlock:(MPFindObjectsBlock)block
{
    if (![type isSubclassOfClass:[MPModel class]]) {
        block(nil, nil);
    } else {
             NSString *url = [NSString stringWithFormat:@"%@%@/%@%@", kMP_BASE_API_URL, [self.class baseURL], self.objID, [type baseURL]];
        MPRequest *request = [[MPRequest alloc] initWithURL:url];

        // Attempt to see if we already have this relation
           NSString *relation = [[MPUtils stripClassName:type].lowercaseString stringByAppendingString:@"s"];
        NSSet *relatedObjects = [self valueForKey:relation];

        if (relatedObjects && relatedObjects.count > 0) {
            // We have some objects so lets exclude these from our request
            NSMutableArray *uuids = [NSMutableArray arrayWithCapacity:0];
            for (MPModel *obj in relatedObjects) {
                [uuids addObject:obj.uuid];
            }

            [request setParam:[uuids componentsJoinedByString:@";"] forKey:@"exclude_uuids"];
        }

        [MPUser signRequest:request];
        [request setRequestMethod:@"POST"];
        [request submit:^(MPResponse *resp, NSError *error) {
            if (error) {
                if (relatedObjects.count > 0) {
                    block([relatedObjects allObjects], nil);
                } else {
                    block(nil, error);
                }
            } else {
                // Combine all of our objects
                NSMutableArray *allObjects = [[type createListWithResponse:resp] mutableCopy];
                if (allObjects.count > 0) {
                    [allObjects addObjectsFromArray:[relatedObjects allObjects]];

                    // Make sure they're now all saved in the persistence store
                    NSArray *savedObjects = [MPModel saveAllLocally:allObjects forEntityName:NSStringFromClass(type)];
                    for (NSObject *obj in savedObjects) {
                        [obj setValue:self forKey:[MPUtils stripClassName:self.class].lowercaseString];
                    }

                    // Set them as our related objects for this relationship
                    [self setValue:[NSSet setWithArray:savedObjects] forKey:relation];

                    [MPModel saveAllLocally:savedObjects forEntityName:NSStringFromClass(type)];
                    block(allObjects, nil);
                } else {
                    block([relatedObjects allObjects], nil);
                }
            }

        }];
    }
}

这些方法运行完美，直到第二次调用saveAllLocally，这是我得到错误的地方。 MPModel类还使用willSave方法，该方法具有以下内容：

- (void) willSave
{
    NSDate *now = [NSDate date];

    if (!self.updated_at) {
        self.updated_at = now;
    }

    if (!self.created_at) {
        self.created_at = now;
    }

    if (!self.uuid) {
        self.uuid = [self createUUID];
    }

    if (!self.last_sync) {
        self.last_sync = now;
    }

    if ([self isUpdated] && self.changedValues.count > 0) {

        if (!self.attribute_updated_at) {
            NSDictionary *attributes = [self.entity attributesByName];
            NSMutableDictionary *dates = [NSMutableDictionary dictionaryWithCapacity:0];
            for (NSString *attr in attributes.allKeys) {
                [dates setObject:now forKey:attr];
            }

            [self setAttributeUpdatedDates:dates];
        }

        if (_updatedAtSet) {
            _updatedAtSet = NO;
        } else {
            if ([self.changedValues.allKeys containsObject:@"last_sync"]) {
                self.updated_at = [self.changedValues objectForKey:@"last_sync"];
            } else {
                self.updated_at = [NSDate date];
            }

                         _updatedAtSet = YES;
                 NSDictionary *changed = [self changedValues];
            NSMutableDictionary *dates = [[self attributeUpdatedDates] mutableCopy];

            for (NSString *key in changed.allKeys) {
                [dates setObject:now forKey:key];
            }

            [self setAttributeUpdatedDates:dates];
        }

    }
}

从我可以收集的内容来看，这应该没问题，因为如果_updatedAtSet变量设置为true，它不应该再设置任何值，但是它仍然在破坏，我无法找出原因！

请有人帮助我感谢

Answer 1

已经解决了。

我刚刚将_updatedAtSet = NO;移动到didSave方法而不是它的位置，现在它正常工作。不管怎样，谢谢

NSInternalInconsistencyException递归弄脏混乱

1 个答案: