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我使用 Restkit 0.20（第一次）通过 JSON 将对象发布到 Rails 服务器，最近几天我一直被一个恼人的映射错误困住。得到 2 个对象图片和项目。

Picture
{
"base64" : null,
"id" : 1,
"created_at" : "2013-08-28T15:08:49Z",
"user_nickname" : "user_name",
"tag" : "ALPHA",
"nbitems" : null,
"path" : {
  "url" : "https://www.mywebsite/pictures/1/default.jpg"
},
"updated_at" : "2013-08-28T15:08:49Z",
"user_id" : 1
}


Item
{
"base64" : null,
"picture_id" : 1,
"id" : 1,
"created_at" : "2013-08-28T15:10:54Z",
"itemurl" : {
  "url" : "https://www.mywebsite/pictures/1/item1.png"
},
"nickname" : "",
"user_id" : 1,
"updated_at" : "2013-08-28T15:10:54Z"
}

这是我在 AppDelegate.m 中的映射

    //Mapping users
RKEntityMapping *userMapping = [RKEntityMapping mappingForEntityForName:NSStringFromClass([User class]) inManagedObjectStore:manager.managedObjectStore];
[userMapping addAttributeMappingsFromDictionary:@{
 @"id" : @"user_id",
 @"email" : @"email",
 @"nickname" : @"nickname",
 @"created_at" : @"createdAt"
 }];
userMapping.identificationAttributes = @[ @"user_id" ];


//Mapping paths
RKEntityMapping *pathMapping = [RKEntityMapping mappingForEntityForName:NSStringFromClass([Path class]) inManagedObjectStore:manager.managedObjectStore];
[pathMapping addAttributeMappingsFromDictionary:@{
 @"url" : @"url"
 }];

//Mapping itemURL
RKEntityMapping *itemURLMapping = [RKEntityMapping mappingForEntityForName:NSStringFromClass([ItemURL class]) inManagedObjectStore:manager.managedObjectStore];
[pathMapping addAttributeMappingsFromDictionary:@{
 @"url" : @"url"
 }];


//Mapping pictures
RKEntityMapping *pictureMapping = [RKEntityMapping mappingForEntityForName:NSStringFromClass([Picture class]) inManagedObjectStore:managedObjectStore];
[pictureMapping addAttributeMappingsFromDictionary:@{
 @"id" : @"picture_id",
 @"user_id" : @"user_id",
 @"user_nickname" : @"user_nickname",
 @"nbitems" : @"nbitems",
 @"tag" : @"tag",
 @"base64" : @"base64",  
 @"created_at" : @"createdAt"
 }];
pictureMapping.identificationAttributes = @[ @"picture_id"];
[pictureMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"path" toKeyPath:@"path" withMapping:pathMapping]];

[manager addResponseDescriptorsFromArray:@[
[RKResponseDescriptor responseDescriptorWithMapping:pictureMapping
                                         pathPattern:@"pictures"
                                         keyPath:nil
                                         statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)]
 ]];

RKObjectMapping *pictureRequestMapping = [RKObjectMapping requestMapping];
[pictureRequestMapping addAttributeMappingsFromArray:@[@"user_id", @"user_nickname", @"tag", @"base64", @"path"]];
RKRequestDescriptor *pictureRequestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:pictureRequestMapping objectClass:[Picture class] rootKeyPath:@"picture" method:RKRequestMethodAny];
[manager addRequestDescriptor:pictureRequestDescriptor];


//Mapping items
RKEntityMapping *itemMapping = [RKEntityMapping mappingForEntityForName:NSStringFromClass([Item class]) inManagedObjectStore:managedObjectStore];
itemMapping.identificationAttributes = @[ @"item_id"];
[itemMapping addAttributeMappingsFromDictionary:@{
 @"id" : @"item_id",
 @"picture_id" : @"picture_id",
 @"user_id" : @"user_id",
 @"nickname" : @"nickname",
 @"base64" : @"base64",
 @"created_at" : @"createdAt"
 }];
RKRelationshipMapping *itemURLRelation = [RKRelationshipMapping relationshipMappingFromKeyPath:@"itemurl" toKeyPath:@"itemurl" withMapping:itemURLMapping];
[itemMapping addPropertyMapping:itemURLRelation];

RKResponseDescriptor *itemDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:itemMapping
                                         pathPattern:@"items"
                                             keyPath:nil
                                         statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[manager addResponseDescriptor:itemDescriptor];

RKObjectMapping *itemRequestMapping = [RKObjectMapping requestMapping];
[itemRequestMapping addAttributeMappingsFromArray:@[@"picture_id", @"user_id", @"nickname", @"base64", @"itemurl"]];
RKRequestDescriptor *itemRequestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:itemRequestMapping objectClass:[Item class] rootKeyPath:@"item" method:RKRequestMethodAny];
[manager addRequestDescriptor:itemRequestDescriptor];

我在 ViewController 中发布了一个图片实例，它工作得很好

    - (void)uploadPicture:(UIImage *)chosenImage{
    NSManagedObjectContext *moc = [RKManagedObjectStore defaultStore].mainQueueManagedObjectContext;
UIImage *resizedImage = [self scaleImage:chosenImage maxWidth:640 maxHeight:960];
NSString *imageEncoded = [self image2jpg2String:resizedImage];

Picture *picture = [Picture insertInManagedObjectContext:moc];
picture.user_id = userId;
picture.user_nickname = @"user_nickname";
picture.tag = @"ALPHA";
picture.base64 = imageEncoded;

[[RKObjectManager sharedManager] postObject:picture path:@"pictures" parameters:nil success:nil failure:^(RKObjectRequestOperation *operation, NSError *error) { NSLog(@"Error: %@",error);}];
    }

我尝试对另一个控制器中的 Item 实例做同样的事情

    - (void)uploadItem{
    NSManagedObjectContext *mocFVC = [RKManagedObjectStore defaultStore].mainQueueManagedObjectContext;
NSNumber *userId = [NSNumber numberWithInt:1];
UIImage *itemImage = self.itemImage.image;
UIImage *resizedItem = [self scaleImage:itemImage maxWidth:640 maxHeight:960];
NSString *itemEncoded = [self image2png2String:resizedItem];

Item *item = [Item insertInManagedObjectContext:mocFVC];
item.user_id = userId;
item.nickname = @"user_nickname";
item.picture_id = pictureToDisplay.picture_id;
item.base64 = itemEncoded;

[[RKObjectManager sharedManager] postObject:item path:@"items" parameters:nil success:nil failure:^(RKObjectRequestOperation *operation, NSError *error) { NSLog(@"Error: %@",error);}];    
    }

但除非我注释 item.base64，否则 xcode 总是返回以下错误

    2013-08-28 22:51:41.116 MYPROJECT[4588:1603] E restkit.network:RKObjectRequestOperation.m:243 POST 'http://www.mywebsite/items' (422 Unprocessable Entity / 0 objects) [request=0.6791s mapping=0.0000s total=0.7111s]: Error Domain=org.restkit.RestKit.ErrorDomain Code=1001 "No mappable object representations were found at the key paths searched." 
    UserInfo=0x1e8af330 {DetailedErrors=(), NSLocalizedFailureReason=The mapping operation was unable to find any nested object representations at the key paths searched: error
    The representation inputted to the mapper was found to contain nested object representations at the following key paths: itemurl

    This likely indicates that you have misconfigured the key paths for your mappings., NSLocalizedDescription=No mappable object representations were found at the key paths searched., keyPath=null}

    2013-08-28 22:51:41.119 MYPROJECT[4588:907] Error: Error Domain=org.restkit.RestKit.ErrorDomain Code=1001 "No mappable object representations were found at the key paths searched." UserInfo=0x1e8af330 {DetailedErrors=(), NSLocalizedFailureReason=The mapping operation was unable to find any nested object representations at the key paths searched: error

    The representation inputted to the mapper was found to contain nested object representations at the following key paths: itemurl

    This likely indicates that you have misconfigured the key paths for your mappings., NSLocalizedDescription=No mappable object representations were found at the key paths searched., keyPath=null}

我在 stackoverflow 上查看了很多帖子，并在发布前阅读了 restkit 文档，但不明白为什么它对我的项目不起作用，因为它的代码和图片模型与我用于我的项目类的模型非常接近。我错过了什么吗？任何想法 ？:)

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1 回答 1

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@Wain 日志没有显示任何内容

结果证明 Restkit 部分是正确的。该错误发生在模型中的 base64/upload 函数中。

    def base64=(data)
# decode data and create stream on them
filename = "#{self.user_id}.png"
io = CarrierStringIO.new(filename, Base64.decode64(data))

# this will do the thing (photo is mounted carrierwave uploader)
self.path = io
end

文件名行在网络浏览器中工作，但不使用 JSON。#weird 必须更改文件的路径以将 user_id 保留为数据

于 2013-08-30T01:11:10.040 回答