mirror of
https://github.com/zhigang1992/RestKit.git
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262 lines
9.7 KiB
Objective-C
262 lines
9.7 KiB
Objective-C
//
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// RKObjectLoader.m
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// RestKit
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//
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// Created by Blake Watters on 8/8/09.
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// Copyright 2009 Two Toasters. All rights reserved.
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//
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#import <CoreData/CoreData.h>
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#import "../CoreData/RKManagedObjectStore.h"
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#import "RKObjectLoader.h"
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#import "RKObjectManager.h"
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#import "Errors.h"
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#import "RKManagedObject.h"
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#import "RKURL.h"
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#import "RKNotifications.h"
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@implementation RKObjectLoader
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@synthesize mapper = _mapper, response = _response, objectClass = _objectClass, targetObject = _targetObject,
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keyPath = _keyPath, managedObjectStore = _managedObjectStore;
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+ (id)loaderWithResourcePath:(NSString*)resourcePath mapper:(RKObjectMapper*)mapper delegate:(NSObject<RKObjectLoaderDelegate>*)delegate {
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return [[[self alloc] initWithResourcePath:resourcePath mapper:mapper delegate:delegate] autorelease];
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}
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- (id)initWithResourcePath:(NSString*)resourcePath mapper:(RKObjectMapper*)mapper delegate:(NSObject<RKObjectLoaderDelegate>*)delegate {
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if (self = [self initWithURL:[[RKClient sharedClient] URLForResourcePath:resourcePath] delegate:delegate]) {
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_mapper = [mapper retain];
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self.managedObjectStore = nil;
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_targetObjectID = nil;
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[[RKClient sharedClient] setupRequest:self];
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}
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return self;
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}
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- (void)dealloc {
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[_mapper release];
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_mapper = nil;
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[_response release];
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_response = nil;
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[_keyPath release];
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_keyPath = nil;
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[_targetObject release];
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_targetObject = nil;
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[_targetObjectID release];
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_targetObjectID = nil;
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self.managedObjectStore = nil;
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[super dealloc];
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}
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- (void)setTargetObject:(NSObject<RKObjectMappable>*)targetObject {
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[_targetObject release];
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_targetObject = nil;
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_targetObject = [targetObject retain];
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[_targetObjectID release];
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_targetObjectID = nil;
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if ([targetObject isKindOfClass:[NSManagedObject class]]) {
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_targetObjectID = [[(NSManagedObject*)targetObject objectID] retain];
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}
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}
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#pragma mark Response Processing
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- (void)responseProcessingSuccessful:(BOOL)successful withError:(NSError*)error {
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_isLoading = NO;
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NSDate* receivedAt = [NSDate date];
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if (successful) {
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_isLoaded = YES;
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NSDictionary* userInfo = [NSDictionary dictionaryWithObjectsAndKeys:[self HTTPMethod], @"HTTPMethod",
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[self URL], @"URL",
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receivedAt, @"receivedAt",
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nil];
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[[NSNotificationCenter defaultCenter] postNotificationName:kRKResponseReceivedNotification
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object:_response
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userInfo:userInfo];
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} else {
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NSDictionary* userInfo = [NSDictionary dictionaryWithObjectsAndKeys:[self HTTPMethod], @"HTTPMethod",
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[self URL], @"URL",
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receivedAt, @"receivedAt",
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error, @"error",
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nil];
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[[NSNotificationCenter defaultCenter] postNotificationName:kRKRequestFailedWithErrorNotification
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object:self
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userInfo:userInfo];
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}
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}
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- (BOOL)encounteredErrorWhileProcessingRequest:(RKResponse*)response {
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if ([response isFailure]) {
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[(NSObject<RKObjectLoaderDelegate>*)_delegate objectLoader:self didFailWithError:response.failureError];
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[self responseProcessingSuccessful:NO withError:response.failureError];
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return YES;
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} else if ([response isError]) {
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NSError* error = nil;
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if ([response isJSON]) {
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error = [_mapper parseErrorFromString:[response bodyAsString]];
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[(NSObject<RKObjectLoaderDelegate>*)_delegate objectLoader:self didFailWithError:error];
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} else {
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// TODO: We've likely run into a maintenance page here. Consider adding the ability
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// to put the stack into offline mode in response...
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if ([_delegate respondsToSelector:@selector(objectLoaderDidLoadUnexpectedResponse:)]) {
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[(NSObject<RKObjectLoaderDelegate>*)_delegate objectLoaderDidLoadUnexpectedResponse:self];
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}
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}
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[self responseProcessingSuccessful:NO withError:error];
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return YES;
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}
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return NO;
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}
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- (void)informDelegateOfObjectLoadWithInfoDictionary:(NSDictionary*)dictionary {
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NSArray* models = [dictionary objectForKey:@"models"];
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[dictionary release];
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// NOTE: The models dictionary may contain NSManagedObjectID's from persistent objects
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// that were model mapped on a background thread. We look up the objects by ID and then
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// notify the delegate that the operation has completed.
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NSMutableArray* objects = [NSMutableArray arrayWithCapacity:[models count]];
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for (id object in models) {
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if ([object isKindOfClass:[NSManagedObjectID class]]) {
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[objects addObject:[self.managedObjectStore objectWithID:(NSManagedObjectID*)object]];
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} else {
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[objects addObject:object];
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}
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}
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[(NSObject<RKObjectLoaderDelegate>*)_delegate objectLoader:self didLoadObjects:[NSArray arrayWithArray:objects]];
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[self responseProcessingSuccessful:YES withError:nil];
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}
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- (void)informDelegateOfObjectLoadErrorWithInfoDictionary:(NSDictionary*)dictionary {
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NSError* error = [dictionary objectForKey:@"error"];
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[dictionary release];
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NSLog(@"[RestKit] RKObjectLoader: Error saving managed object context: error=%@ userInfo=%@", error, error.userInfo);
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NSDictionary *userInfo = [NSDictionary dictionaryWithObjectsAndKeys:
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[error localizedDescription], NSLocalizedDescriptionKey,
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nil];
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NSError *rkError = [NSError errorWithDomain:RKRestKitErrorDomain code:RKObjectLoaderRemoteSystemError userInfo:userInfo];
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[(NSObject<RKObjectLoaderDelegate>*)_delegate objectLoader:self didFailWithError:rkError];
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[self responseProcessingSuccessful:NO withError:rkError];
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}
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- (void)processLoadModelsInBackground:(RKResponse *)response {
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NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
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RKManagedObjectStore* objectStore = self.managedObjectStore;
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/**
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* If this loader is bound to a particular object, then we map
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* the results back into the instance. This is used for loading and updating
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* individual object instances via getObject & friends.
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*/
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NSArray* results = nil;
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if (self.targetObject) {
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if (_targetObjectID) {
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NSManagedObject* backgroundThreadModel = [self.managedObjectStore objectWithID:_targetObjectID];
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[_mapper mapObject:backgroundThreadModel fromString:[response bodyAsString]];
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results = [NSArray arrayWithObject:backgroundThreadModel];
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} else {
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[_mapper mapObject:self.targetObject fromString:[response bodyAsString]];
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results = [NSArray arrayWithObject:self.targetObject];
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}
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} else {
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id result = [_mapper mapFromString:[response bodyAsString] toClass:self.objectClass keyPath:_keyPath];
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if ([result isKindOfClass:[NSArray class]]) {
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results = (NSArray*)result;
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} else {
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// Using arrayWithObjects: instead of arrayWithObject:
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// so that in the event result is nil, then we get empty array instead of exception for trying to insert nil.
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results = [NSArray arrayWithObjects:result, nil];
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}
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if (objectStore && [objectStore managedObjectCache]) {
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if ([self.URL isKindOfClass:[RKURL class]]) {
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RKURL* rkURL = (RKURL*)self.URL;
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NSArray* fetchRequests = [[objectStore managedObjectCache] fetchRequestsForResourcePath:rkURL.resourcePath];
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NSArray* cachedObjects = [RKManagedObject objectsWithFetchRequests:fetchRequests];
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for (id object in cachedObjects) {
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if ([object isKindOfClass:[RKManagedObject class]]) {
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if (NO == [results containsObject:object]) {
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[[objectStore managedObjectContext] deleteObject:object];
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}
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}
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}
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}
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}
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}
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// Before looking up NSManagedObjectIDs, need to save to ensure we do not have
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// temporary IDs for new objects prior to handing the objectIDs across threads
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NSError* error = [objectStore save];
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if (nil != error) {
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NSDictionary* infoDictionary = [[NSDictionary dictionaryWithObjectsAndKeys:response, @"response", error, @"error", nil] retain];
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[self performSelectorOnMainThread:@selector(informDelegateOfObjectLoadErrorWithInfoDictionary:) withObject:infoDictionary waitUntilDone:YES];
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} else {
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// NOTE: Passing Core Data objects across threads is not safe.
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// Iterate over each model and coerce Core Data objects into ID's to pass across the threads.
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// The object ID's will be deserialized back into objects on the main thread before the delegate is called back
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NSMutableArray* models = [NSMutableArray arrayWithCapacity:[results count]];
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for (id object in results) {
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if ([object isKindOfClass:[NSManagedObject class]]) {
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[models addObject:[(NSManagedObject*)object objectID]];
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} else {
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[models addObject:object];
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}
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}
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NSDictionary* infoDictionary = [[NSDictionary dictionaryWithObjectsAndKeys:response, @"response", models, @"models", nil] retain];
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[self performSelectorOnMainThread:@selector(informDelegateOfObjectLoadWithInfoDictionary:) withObject:infoDictionary waitUntilDone:YES];
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}
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[pool drain];
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}
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- (void)didFailLoadWithError:(NSError*)error {
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if ([_delegate respondsToSelector:@selector(request:didFailLoadWithError:)]) {
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[_delegate request:self didFailLoadWithError:error];
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}
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[(NSObject<RKObjectLoaderDelegate>*)_delegate objectLoader:self didFailWithError:error];
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[self responseProcessingSuccessful:NO withError:error];
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}
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- (void)didFinishLoad:(RKResponse*)response {
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_response = [response retain];
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if ([_delegate respondsToSelector:@selector(request:didLoadResponse:)]) {
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[_delegate request:self didLoadResponse:response];
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}
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if (NO == [self encounteredErrorWhileProcessingRequest:response]) {
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// TODO: When other mapping formats are supported, unwind this assumption...
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if ([response isSuccessful] && [response isJSON]) {
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[self performSelectorInBackground:@selector(processLoadModelsInBackground:) withObject:response];
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} else {
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NSLog(@"Encountered unexpected response code: %d (MIME Type: %@)", response.statusCode, response.MIMEType);
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if ([_delegate respondsToSelector:@selector(objectLoaderDidLoadUnexpectedResponse:)]) {
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[(NSObject<RKObjectLoaderDelegate>*)_delegate objectLoaderDidLoadUnexpectedResponse:self];
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}
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[self responseProcessingSuccessful:NO withError:nil];
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}
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}
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}
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@end
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