Restkit 将响应映射到 parent 实体 - 当响应没有 parent 实体值时

Question

我在我的项目中使用 RestKit 0.2 版本。我有一种情况需要将响应映射到已保存的 parent 实体。

我的ParentClass是对话&对话可以有很多消息。

首先，我将 Coredata 中的所有对话保存在 Conversation 实体下。

然后我调用这个 url 来获取与特定对话相关的所有消息。

http://myUrl/conversations/bdc34e2a-fa1f-4dbe-83b4-3296ff657e93/messages

bdc34e2a-fa1f-4dbe-83b4-3296ff657e93 是我的会话 ID

这是我的 json 回复。

[  
 {  
  "id":"5f67f6f5-934d-403e-ac64-19dbd4defeda",
  "sent_at":"2016-06-08T12:24:28+0000",
  "read_at":null,
  "sender":{  },
  "content":"test message",
  "attachment":{  }
 },
 {  
  "id":"c4d18b33-4c54-4e7e-a964-a5cedc087122",
  "sent_at":"2016-06-08T09:59:41+0000",
  "read_at":null,
  "sender":{  },
  "content":"abc test message",
  "attachment":{  }
 },

我的 Json 回复没有对话属性，但我需要将我的所有消息映射到相关对话下。

RKEntityMapping *messageMapping = [RKEntityMapping mappingForEntityForName:[Message entityName] inManagedObjectStore:[[DataStoreManager sharedManager] managedObjectStore]];

[messageMapping addAttributeMappingsFromDictionary:@{
                                                     @"id":@"identifier",
                                                     @"sent_at": @"date",
                                                     @"content": @"message",

                                                    }];

messageMapping.identificationAttributes = @[@"identifier"];

我有多对一消息与对话的关系。

[messageMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:nil toKeyPath:@"conversation" withMapping:**conversationMapping**]];

但是我该如何创建 conversationMapping 呢？

Edited - Trying with routing & meta data

正如@Wain 所建议的，我正在尝试使用 restkit 路由

// conversation mapping
RKEntityMapping *conversationMapping = [RKEntityMapping mappingForEntityForName:[Conversation entityName] inManagedObjectStore:[[BADataStoreManager sharedManager] managedObjectStore]];

[conversationMapping addAttributeMappingsFromDictionary:@{
                                                          @"@metadata.routing.parameters.identifier": @"identifier"

                                                          }];


conversationMapping.identificationAttributes = @[@"identifier"];

[messageMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:nil toKeyPath:@"messages" withMapping:conversationMapping]];

这是我的响应描述符

RKResponseDescriptor *conversationDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:[EntityMappingProvider messagesResponseMapping] method:RKRequestMethodAny pathPattern:@"/conversations/:identifier/messages" keyPath:nil statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

[[DataStoreManager sharedManager].router.routeSet addRoute:[RKRoute routeWithName:@"conversations" pathPattern:@"/conversations/:identifier/messages" method:RKRequestMethodGET]];

[[DataStoreManager sharedManager] addResponseDescriptor:conversationDescriptor];

[[DataStoreManager sharedManager] getObjectsAtPathForRouteNamed:@"conversations" object:conversation parameters:nil
                                                         success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
                                                             RKLogInfo(@"response %@",mappingResult);
                                                         }

                                                         failure:^(RKObjectRequestOperation *operation, NSError *error) {
                                                             RKLogInfo(@"error response %@", error.localizedDescription );
                                                         }];

object:conversation 将在用户 select 会话列表中有一个会话时发送。

但对话仍未正确映射到消息。

& 我只能调用此方法一次，然后出现以下错误。

reason: 'Cannot add a route with the same name as an existing route.'

但它应该可用于所有对话，只要用户 select 进行对话，就会调用此方法。

Solution

在映射对话中的消息之前，我使用响应描述符来映射对话和用户。因此，当我为对话中的消息使用响应描述符时，它被映射到先前定义的描述符。

所以我不得不使用 pathPattern 并指定响应描述符，然后它正确映射，正如@Wain 解释的那样，我已经初始化了所有响应描述符一次并多次使用 getObjectsAtPathForRouteNamed .

最后是我的对话映射及其响应描述符

// conversation mapping
RKEntityMapping *conversationMapping = [RKEntityMapping mappingForEntityForName:[Conversation entityName] inManagedObjectStore:[[BADataStoreManager sharedManager] managedObjectStore]];
[conversationMapping addAttributeMappingsFromDictionary:@{
                                                          @"@metadata.routing.parameters.identifier": @"identifier"

                                                          }];
conversationMapping.identificationAttributes = @[@"identifier"];
[messageMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:nil toKeyPath:@"messages" withMapping:conversationMapping]];

// Response descriptor 
RKResponseDescriptor *conversationDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:[EntityMappingProvider messagesResponseMapping] method:RKRequestMethodAny pathPattern:@"/conversations/:identifier/messages" keyPath:nil statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[[DataStoreManager sharedManager].router.routeSet addRoute:[RKRoute routeWithName:@"conversations" pathPattern:@"/conversations/:identifier/messages" method:RKRequestMethodGET]];
[[DataStoreManager sharedManager] addResponseDescriptor:conversationDescriptor];
[[DataStoreManager sharedManager] getObjectsAtPathForRouteNamed:@"conversations" object:conversation parameters:nil
                                                         success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
                                                             RKLogInfo(@"response %@",mappingResult);
                                                         }
                                                              failure:^(RKObjectRequestOperation *operation, NSError *error) {
                                                             RKLogInfo(@"error response %@", error.localizedDescription );
                                                         }];

Answer 1

你真的应该使用路由，这样你就可以使用路径模式来插入对话 ID。然后您可以使用映射元数据访问映射中的 id 值并使用它连接到适当的对象。

Restkit 将响应映射到 parent 实体 - 当响应没有 parent 实体值时

Restkit map the response to a parent Entity - when response does not have parent entity values

json

core-data

ios

restkit

restkit-0.20