I am using RestKit for developing some todo list app. I am facing some mapping problem regarding returned json form server with CoreData in iOS.
The Scenario
Following is the image of list and tasks entities which i am using.
When someone adds a new task to the list on the server i return following Json of that particular list:
`GET www.mydomain.com\api\list\1`
[ { "list" :
{ "listID" : "1",
"listName" : "New List ",
"listSyncStatus" : "1"
},
"tasks" : [ { "listID" : "1",
"taskCompletionStatus" : "1",
"taskID" : "24",
"taskName" : "Server Added 2",
"taskSyncStatus" : "1"
},
{ "listID" : "1",
"taskCompletionStatus" : "1",
"taskID" : "25",
"taskName" : "Server Added 3",
"taskSyncStatus" : "1"
},
{ "listID" : "1",
"taskCompletionStatus" : "1",
"taskID" : "23",
"taskName" : "Server Added",
"taskSyncStatus" : "1"
}
]
}
]
my response descriptor for above json is as follows:
RKResponseDescriptor *taskResponseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:taskEntityMapping
method:RKRequestMethodGET
pathPattern:@"/api/list/:id"
keyPath:@"tasks"
statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
and for my core data mapping i use following relationship mapping:
[taskEntityMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"list"
toKeyPath:@"list"
withMapping:listEntityMapping]];
my taskEntityMapping is as follows:
NSDictionary *taskObjectMapping = @{
@"listID" : @"listID",
@"taskID" : @"taskID",
@"taskName" : @"taskName",
@"taskCompletionStatus" : @"taskCompletionStatus",
@"taskSyncStatus" : @"taskSyncStatus"
};
RKEntityMapping *taskEntityMapping = [RKEntityMapping mappingForEntityForName:@"Task" inManagedObjectStore:managedObjectStore];
[taskEntityMapping addAttributeMappingsFromDictionary:taskObjectMapping];
taskEntityMapping.identificationAttributes = @[ @"taskID" ];
and my listEntityMapping is as follows:
//ALL LISTS RELATED REQUESTS
NSDictionary *listObjectMapping = @{
@"listID" : @"listID",
@"listName" : @"listName",
@"listSyncStatus" : @"listSyncStatus",
};
RKEntityMapping *listEntityMapping = [RKEntityMapping mappingForEntityForName:@"List" inManagedObjectStore:managedObjectStore];
[listEntityMapping addAttributeMappingsFromDictionary:listObjectMapping];
listEntityMapping.identificationAttributes = @[ @"listID" ];
On execution my app crashes with following error
Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Expected a dictionary representation'
and request log is as follows:
2014-02-03 13:17:29.789 RKGist[984:70b] T restkit.network:RKObjectRequestOperation.m:178 GET 'http://mydomain.com/api/list/1':
request.headers={
Accept = "application/json";
"Accept-Language" = "en;q=1, fr;q=0.9, de;q=0.8, zh-Hans;q=0.7, zh-Hant;q=0.6, ja;q=0.5";
"User-Agent" = "RKGist/1.0 (iPhone Simulator; iOS 7.0.3; Scale/2.00)";
}
request.body=(null)
2014-02-03 13:17:30.670 RKGist[984:f03] T restkit.network:RKResponseMapperOperation.m:451 Mapping HTTP response to nil target object...
2014-02-03 13:17:30.670 RKGist[984:f03] D restkit.object_mapping:RKMapperOperation.m:377 Executing mapping operation for representation: (
{
list = {
listID = 1;
listName = "New List ";
listSyncStatus = 1;
};
tasks = (
{
listID = 1;
taskCompletionStatus = 1;
taskID = 24;
taskName = "Server Added 2";
taskSyncStatus = 1;
},
{
listID = 1;
taskCompletionStatus = 1;
taskID = 25;
taskName = "Server Added 3";
taskSyncStatus = 1;
},
{
listID = 1;
taskCompletionStatus = 1;
taskID = 23;
taskName = "Server Added";
taskSyncStatus = 1;
}
);
}
)
and targetObject: (null)
2014-02-03 13:17:30.671 RKGist[984:f03] T restkit.object_mapping:RKMapperOperation.m:320 Examining keyPath 'tasks' for mappable content...
2014-02-03 13:17:30.671 RKGist[984:f03] D restkit.object_mapping:RKMapperOperation.m:297 Found mappable collection at keyPath 'tasks': (
(
{
listID = 1;
taskCompletionStatus = 1;
taskID = 24;
taskName = "Server Added 2";
taskSyncStatus = 1;
},
{
listID = 1;
taskCompletionStatus = 1;
taskID = 25;
taskName = "Server Added 3";
taskSyncStatus = 1;
},
{
listID = 1;
taskCompletionStatus = 1;
taskID = 23;
taskName = "Server Added";
taskSyncStatus = 1;
}
)
)
the log says found mappable collection at keypath tasks.
Can anyone guide me what am i doing wrong here. Is my returned json format wrong or my mapping code is wrong ?
