I am having a problem posting an NSManagedObject using RestKit 0.20pre6 where it results in creating an entry on my Rails site with nil values. I suspect the mapper but I have set up my RK objects to the best of my knowledge correctly. There are very few examples and limited support. The example deals with NSObjects and not CoreData so I’ve had to make some assumptions.
Here is my code for posting and followed by the console output. The app gets objects from the server fine.
// Sync the added object to the server
// ****************************************
RKObjecMapping *responseMapping = [RKObjectMapping mappingForClass:[Event class]];
// RKEntityMapping *responseMapping = [RKEntityMapping mappingForEntityForName:@"Event" inManagedObjectStore:self.managedObjectStore];
[responseMapping addAttributeMappingsFromDictionary:@{
@"id": @"eventId",
@"name": @"name",
@"amount": @"amount",
@"length": @"length",
@"updated_at": @"updatedAt",
@"created_at": @"createdAt",
@"latitude": @"latitude",
@"longitude": @"longitude",
@"thumbnail": @"thumbnail",
@"airTemp": @"airTemp",
}];
NSIndexSet *statusCodes = RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful); // Anything in 2xx
RKResponseDescriptor *eventDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:responseMapping
pathPattern:@"/events"
keyPath:@"events"
statusCodes:statusCodes
];
RKObjectMapping *requestMapping = [RKObjectMapping requestMapping]; // objectClass == NSMutableDictionary
[requestMapping addAttributeMappingsFromDictionary:@{
@"id": @"eventId",
@"name": @"name",
@"amount": @"amount",
@"length": @"length",
@"updated_at": @"updatedAt",
@"created_at": @"createdAt",
@"latitude": @"latitude",
@"longitude": @"longitude",
@"thumbnail": @"thumbnail",
@"airTemp": @"airTemp",
}];
// For any object of class Article, serialize into an NSMutableDictionary using the given mapping and nest
// under the 'article' key path
RKRequestDescriptor *requestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:requestMapping
objectClass:[Event class]
rootKeyPath:@"events"
];
LocationsAppDelegate *appDelegate = (LocationsAppDelegate *)[[UIApplication sharedApplication] delegate];
// RKObjectManager *manager = [RKObjectManager managerWithBaseURL:gBaseURL];
[RKObjectManager sharedManager].requestSerializationMIMEType = RKMIMETypeJSON;
[[RKObjectManager sharedManager] addRequestDescriptor:requestDescriptor];
[[RKObjectManager sharedManager] addResponseDescriptor:eventDescriptor];
NSLog(@"RVC-addEvent %@ - %@", appDelegate.user.login, appDelegate.user.password);
[[NBEventManager sharedManager] setUsername:appDelegate.user.login andPassword:appDelegate.user.password];
appDelegate.objectManager.HTTPClient = [NBEventManager sharedManager];
event = [eventsArray objectAtIndex:0];
[[RKObjectManager sharedManager] postObject:event
path:@"/events"
parameters:nil
success:nil
failure:nil
];
}
2013-01-15 23:25:52.857 fish[38803:13403] I
restkit.network:RKHTTPRequestOperation.m:152 POST
‘http://localhost:3000/events’ 2013-01-15 23:25:52.969
fish[38803:16903] I restkit.network:RKHTTPRequestOperation.m:179 POST
‘http://localhost:3000/events’ (201 Created) [0.1121 s] 2013-01-15
23:25:52.971 fish[38803:17507] D
restkit.object_mapping:RKMapperOperation.m:360 Executing mapping
operation for representation: {
event = {
airTemp = “”;
amount = “”;
“created_at” = “2013-01-16T04:25:52Z”;
id = 54;
latitude = “”;
length = “”;
longitude = “”;
name = “”;
thumbnail = “”;
“updated_at” = “2013-01-16T04:25:52Z”;
“user_id” = “”;
}; } and targetObject: (entity: Event; id: 0x9c7f710
; data:
{
airTemp = 0;
amount = nil;
createdAt = “2013-01-16 04:25:52 +0000”;
eventId = 0;
latitude = “28.158466”;
length = 0;
longitude = “-82.509215”;
name = nil;
photo = nil;
thumbnail = nil;
updatedAt = nil; }) 2013-01-15 23:25:52.971 fish[38803:17507] D restkit.object_mapping:RKMapperOperation.m:287 Found mappable data at
keyPath ‘event’: {
airTemp = “”;
amount = “”;
“created_at” = “2013-01-16T04:25:52Z”;
id = 54;
latitude = “”;
length = “”;
longitude = “”;
name = “”;
thumbnail = “”;
“updated_at” = “2013-01-16T04:25:52Z”;
“user_id” = “”; } 2013-01-15 23:25:52.971 fish[38803:17507] D restkit.object_mapping:RKMapperOperation.m:232 Asked to map source
object {
airTemp = “”;
amount = “”;
“created_at” = “2013-01-16T04:25:52Z”;
id = 54;
latitude = “”;
length = “”;
longitude = “”;
name = “”;
thumbnail = “”;
“updated_at” = “2013-01-16T04:25:52Z”;
“user_id” = “”; } with mapping eventId>”,
” name>”,
” amount>”,
” length>”,
” updatedAt>”,
” createdAt>”,
” latitude>”,
” longitude>”,
” airTemp>”,
” thumbnail>” )> 2013-01-15 23:25:52.971 fish[38803:17507] D
restkit.object_mapping:RKMappingOperation.m:754 Starting mapping
operation… 2013-01-15 23:25:52.972 fish[38803:17507] D
restkit.object_mapping:RKMappingOperation.m:818 Finished mapping
operation successfully… 2013-01-15 23:25:52.973 fish[38803:17507] D
restkit.object_mapping:RKMapperOperation.m:316 Found unmappable value
at keyPath: events 2013-01-15 23:25:52.973 fish[38803:17507] D
restkit.object_mapping:RKMapperOperation.m:389 Finished performing
object mapping. Results: {
event = ” (entity: Event; id: 0x9c7f710
; data:
{\n airTemp = nil;\n amount = nil;\n createdAt = \”2013-01-16
04:25:52 +0000\”;\n eventId = 54;\n latitude = nil;\n length
= nil;\n longitude = nil;\n name = nil;\n photo = nil;\n thumbnail = nil;\n updatedAt = \”2013-01-16 04:25:52 +0000\”;\n})”;
} 2013-01-15 23:25:52.973 fish[38803:13403] D
restkit.core_data:RKManagedObjectRequestOperation.m:534 Skipping
deletion of orphaned objects: only performed for GET requests.
2013-01-15 23:25:52.976 fish[38803:11f03] D
restkit.core_data:RKManagedObjectRequestOperation.m:599 Refreshing
mapped target object (entity: Event; id:
0x9c7f710
; data:
{
airTemp = nil;
amount = nil;
createdAt = “2013-01-16 04:25:52 +0000”;
eventId = 54;
latitude = nil;
length = nil;
longitude = nil;
name = nil;
photo = nil;
thumbnail = nil;
updatedAt = “2013-01-16 04:25:52 +0000”; }) in context
Here is my code now as I have moved all of the mappings to the app delegate and have implemented RKEntityMapping. I still get no JSON object attached to the POST call.
RKEntityMapping *eventMapping = [RKEntityMapping mappingForEntityForName:@"Event" inManagedObjectStore:managedObjectStore];
[eventMapping addAttributeMappingsFromDictionary:@{
@"id": @"eventId",
@"name": @"name",
@"amount": @"amount",
@"length": @"length",
@"updated_at": @"updatedAt",
@"created_at": @"createdAt",
@"latitude": @"latitude",
@"longitude": @"longitude",
@"thumbnail": @"thumbnail",
@"airTemp": @"airTemp",
}];
eventMapping.identificationAttributes = @[ @"eventId" ];
//RKRelationshipMapping *eventRelationship = [RKRelationshipMapping relationshipMappingFromKeyPath:@"events"
// toKeyPath:@"events"
// withMapping:eventMapping];
//[eventMapping addPropertyMapping:eventRelationship];
// Register our mappings with the provider
RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:eventMapping
pathPattern:nil
keyPath:@"event"
statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[objectManager addResponseDescriptor:responseDescriptor];
RKEntityMapping *eventRequestMapping = [eventMapping inverseMapping];
RKRequestDescriptor *eventRequestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:eventRequestMapping
objectClass:[Event class]
rootKeyPath:@"event"
];
[objectManager addRequestDescriptor:eventRequestDescriptor];
[RKObjectManager sharedManager].requestSerializationMIMEType = RKMIMETypeJSON;
After getting a better understanding of managedObjectContexts and how RestKit utilizes two of them in particular I was able to get into the right context. There are two created with the createContexts a mainQueue and a persistentStore Context. Also of not is that I needed to select my Event Entity in the data model and change the class from NSManagedObject to Event and RestKit then recognized the entity as that of class Event.