Question

我有非托管对象数据，我想将它们更改为托管对象，但它无法正常工作。我在核心数据中有三个以下实体或表

产品
注释
品牌

产品是主表，评论连接到具有一对多关系的产品（1个产品有很多评论），品牌也连接到产品与一对一的关系。我从服务器端获取数据，并通过将非托管对象转换为托管对象将这些数据写入这些实体。我的产品相关数据写得很成功，但评论和品牌无法做到。以下是我的代码。产品有实体SCProduct，评论有SCComment

在SCProduct.m

-(void)updateWithNMProduct:(NMProduct *)nmProduct{

NSManagedObjectContext *context = [RKManagedObjectStore defaultStore].mainQueueManagedObjectContext;

self.costPrice = [nmProduct.costPrice copy];
self.coverPhoto = [nmProduct.coverPhoto copy];
self.coverPhotoNoSize = [nmProduct.coverPhotoUrlNoSize copy];
self.coverPhotoUrl = [nmProduct.coverPhotoUrl copy];
self.coverPhotoUrlEmail = [nmProduct.coverPhotoUrlEmail copy];
self.createdAt = [nmProduct.createdAt copy];
self.deliveryDays = [nmProduct.deliveryDays copy];
self.deliveryFee = [nmProduct.deliveryFee copy];
self.desc = [nmProduct.desc copy];
self.gender = [nmProduct.gender copy];
self.liked = [nmProduct.liked copy];
self.updatedAt = [nmProduct.updatedAt copy];
self.name = [nmProduct.name copy];
self.numberOfComments = [nmProduct.numberOfComments copy];
self.promoted = nmProduct.promoted;
self.salePrice = [nmProduct.salePrice copy];
self.taxRate = [nmProduct.taxRate copy];


//comments
[self.comments bk_each:^(SCComment *comment){
    [context deleteObject:comment];
}];


NSMutableOrderedSet* tempSequence = [NSMutableOrderedSet orderedSetWithOrderedSet:self.comments];
[tempSequence removeAllObjects];
self.comments = tempSequence;


for(NMComment *comment in nmProduct.comments){
    SCComment *managedComment = [SCComment findOrCreate:comment.commentId];
    [managedComment updateWithNonManagedData:comment];
    [self addItem:managedComment toSet:self.comments];
}
 NMBrand * brand = nmProduct.brand;
    SCBrand *managedComment = [SCBrand findOrCreate:[NSString           stringWithFormat:@"%@",brand.brandId]];
    [managedComment updateWithNonManagedData:managedComment];}

在SCComment.m

中

-(void)updateWithNonManagedData:(NMComment *)nmComment{

self.commentId = [nmComment.commentId copy];
self.key = [nmComment.key copy];

SCCommentValue *cValue = [SCCommentValue findOrCreate:nmComment.value.commentValueId];
[cValue updateWithNonManagedData:nmComment.value];
self.value = cValue;

SCCreator *creator = [SCCreator findOrCreate:nmComment.creator.creatorId];
[creator updateWithNonManagedData:nmComment.creator];
self.creator = creator;   }

我能够获得产品的数据，但不能评论。关系很好并且与托管对象一起使用。请帮助我。提前谢谢。

Answer 1

在方法updateWithNMProduct

中

-(void)updateWithNMProduct:(NMProduct *)nmProduct{

NSManagedObjectContext *context = [RKManagedObjectStore defaultStore].mainQueueManagedObjectContext;

创建context局部变量后，尝试添加此行...

NSManagedObject *newObject = [context insertNewObjectForEntityForName:@"Product"];

然后使用此实例设置实体属性...

例如......

newObject.costPrice = [nmProduct.costPrice copy];

如何将非托管对象更改为核心数据中的托管对象

1 个答案: