mirror of
https://github.com/zhigang1992/RestKit.git
synced 2026-01-12 22:51:50 +08:00
644 lines
29 KiB
Objective-C
644 lines
29 KiB
Objective-C
//
|
|
// RKManagedObjectRequestOperation.m
|
|
// RestKit
|
|
//
|
|
// Created by Blake Watters on 8/9/12.
|
|
// Copyright (c) 2012 RestKit. All rights reserved.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
//
|
|
|
|
#import "RKManagedObjectRequestOperation.h"
|
|
#import "RKLog.h"
|
|
#import "RKHTTPUtilities.h"
|
|
#import "RKResponseMapperOperation.h"
|
|
#import "RKRequestOperationSubclass.h"
|
|
#import "NSManagedObjectContext+RKAdditions.h"
|
|
|
|
// Graph visitor
|
|
#import "RKResponseDescriptor.h"
|
|
#import "RKEntityMapping.h"
|
|
#import "RKDynamicMapping.h"
|
|
#import "RKRelationshipMapping.h"
|
|
|
|
// Set Logging Component
|
|
#undef RKLogComponent
|
|
#define RKLogComponent RKlcl_cRestKitCoreData
|
|
|
|
@interface RKMappingGraphVisitation : NSObject
|
|
@property (nonatomic, strong) id rootKey; // Will be [NSNull null] or a string value
|
|
@property (nonatomic, strong) NSString *keyPath;
|
|
@property (nonatomic, assign, getter = isCyclic) BOOL cyclic;
|
|
@property (nonatomic, strong) RKMapping *mapping;
|
|
@end
|
|
|
|
@implementation RKMappingGraphVisitation
|
|
|
|
- (NSString *)description
|
|
{
|
|
return [NSString stringWithFormat:@"<%@: %p rootKey=%@ keyPath=%@ isCylic=%@ mapping=%@>",
|
|
[self class], self, self.rootKey, self.keyPath, self.isCyclic ? @"YES" : @"NO", self.mapping];
|
|
}
|
|
|
|
@end
|
|
|
|
/**
|
|
This class implements Tarjan's algorithm to efficiently visit all nodes within the mapping graph and detect cycles in the graph.
|
|
|
|
For more details on the algorithm, refer to the Wikipedia page: http://en.wikipedia.org/wiki/Tarjan's_strongly_connected_components_algorithm
|
|
|
|
The following reference implementations were used when building out an Objective-C implementation:
|
|
|
|
1. http://algowiki.net/wiki/index.php?title=Tarjan%27s_algorithm
|
|
1. http://www.logarithmic.net/pfh-files/blog/01208083168/sort.py
|
|
|
|
*/
|
|
@interface RKNestedManagedObjectKeyPathMappingGraphVisitor : NSObject
|
|
@property (nonatomic, readonly, strong) NSMutableArray *visitations;
|
|
- (id)initWithResponseDescriptors:(NSArray *)responseDescriptors;
|
|
@end
|
|
|
|
@interface RKNestedManagedObjectKeyPathMappingGraphVisitor ()
|
|
@property (nonatomic, strong) NSMutableArray *visitationStack;
|
|
@property (nonatomic, strong) NSMutableDictionary *lowValues;
|
|
@property (nonatomic, strong) NSNumber *numberOfDecriptors;
|
|
@property (nonatomic, strong, readwrite) NSMutableArray *visitations;
|
|
@end
|
|
|
|
@implementation RKNestedManagedObjectKeyPathMappingGraphVisitor
|
|
|
|
- (id)initWithResponseDescriptors:(NSArray *)responseDescriptors
|
|
{
|
|
self = [self init];
|
|
if (self) {
|
|
self.numberOfDecriptors = @([responseDescriptors count]);
|
|
self.visitationStack = [NSMutableArray array];
|
|
self.lowValues = [NSMutableDictionary dictionary];
|
|
self.visitations = [NSMutableArray array];
|
|
|
|
for (RKResponseDescriptor *responseDescriptor in responseDescriptors) {
|
|
[self visitMapping:responseDescriptor.mapping atKeyPath:responseDescriptor.keyPath];
|
|
}
|
|
}
|
|
|
|
return self;
|
|
}
|
|
|
|
- (RKMappingGraphVisitation *)visitationForMapping:(RKMapping *)mapping atKeyPath:(NSString *)keyPath
|
|
{
|
|
RKMappingGraphVisitation *visitation = [RKMappingGraphVisitation new];
|
|
visitation.mapping = mapping;
|
|
if ([self.visitationStack count] == 0) {
|
|
// If we are the first item in the stack, we are visiting the rootKey
|
|
visitation.rootKey = keyPath ?: [NSNull null];
|
|
} else {
|
|
// Take the root key from the visitation stack
|
|
visitation.rootKey = [[self.visitationStack objectAtIndex:0] rootKey];
|
|
visitation.keyPath = keyPath;
|
|
}
|
|
|
|
return visitation;
|
|
}
|
|
|
|
// Traverse the mappings graph using Tarjan's algorithm
|
|
- (void)visitMapping:(RKMapping *)mapping atKeyPath:(NSString *)keyPath
|
|
{
|
|
NSValue *dictionaryKey = [NSValue valueWithNonretainedObject:mapping];
|
|
if ([self.lowValues objectForKey:dictionaryKey]) {
|
|
if (![ mapping isKindOfClass:[RKEntityMapping class]]) return;
|
|
|
|
NSArray *keyPathComponents = [[self.visitationStack valueForKey:@"keyPath"] arrayByAddingObject:keyPath];
|
|
NSString *keyPath = [[keyPathComponents subarrayWithRange:NSMakeRange(1, [keyPathComponents count] - 1)] componentsJoinedByString:@"."];
|
|
|
|
RKMappingGraphVisitation *cyclicVisitation = [self visitationForMapping:mapping atKeyPath:keyPath];
|
|
cyclicVisitation.cyclic = YES;
|
|
[self.visitations addObject:cyclicVisitation];
|
|
|
|
return;
|
|
}
|
|
|
|
NSNumber *lowValue = @([self.lowValues count]);
|
|
[self.lowValues setObject:lowValue forKey:dictionaryKey];
|
|
|
|
NSUInteger stackPosition = [self.visitationStack count];
|
|
RKMappingGraphVisitation *visitation = [self visitationForMapping:mapping atKeyPath:keyPath];
|
|
[self.visitationStack addObject:visitation];
|
|
|
|
if ([mapping isKindOfClass:[RKObjectMapping class]]) {
|
|
RKObjectMapping *objectMapping = (RKObjectMapping *)mapping;
|
|
for (RKRelationshipMapping *relationshipMapping in objectMapping.relationshipMappings) {
|
|
[self visitMapping:relationshipMapping.mapping atKeyPath:relationshipMapping.destinationKeyPath];
|
|
|
|
// We want the minimum value
|
|
NSValue *relationshipKey = [NSValue valueWithNonretainedObject:relationshipMapping.mapping];
|
|
NSNumber *relationshipLowValue = [self.lowValues objectForKey:relationshipKey];
|
|
if ([lowValue compare:relationshipLowValue] == NSOrderedDescending) {
|
|
[self.lowValues setObject:relationshipLowValue forKey:dictionaryKey];
|
|
}
|
|
}
|
|
} else if ([mapping isKindOfClass:[RKDynamicMapping class]]) {
|
|
// Pop the visitation stack to remove the dynamic mapping, since each mapping within the dynamic mapping
|
|
// is rooted at the same point in the graph
|
|
[self.visitationStack removeLastObject];
|
|
|
|
for (RKMapping *nestedMapping in [(RKDynamicMapping *)mapping objectMappings]) {
|
|
[self visitMapping:nestedMapping atKeyPath:keyPath];
|
|
}
|
|
}
|
|
|
|
if ([[self.lowValues objectForKey:dictionaryKey] isEqualToNumber:lowValue]) {
|
|
NSRange range = NSMakeRange(stackPosition, [self.visitationStack count] - stackPosition);
|
|
NSArray *visitations = [self.visitationStack subarrayWithRange:range];
|
|
[self.visitationStack removeObjectsInRange:range];
|
|
|
|
// Take everything left on the stack
|
|
NSArray *keyPathComponents = [self.visitationStack valueForKey:@"keyPath"];
|
|
NSString *nestingKeyPath = ([keyPathComponents count] > 1) ? [[keyPathComponents subarrayWithRange:NSMakeRange(1, [keyPathComponents count] - 1)] componentsJoinedByString:@"."] : nil;
|
|
|
|
[visitations enumerateObjectsUsingBlock:^(RKMappingGraphVisitation *visitation, NSUInteger idx, BOOL *stop) {
|
|
// If this is an entity mapping, collect the complete key path
|
|
if ([visitation.mapping isKindOfClass:[RKEntityMapping class]]) {
|
|
visitation.keyPath = nestingKeyPath ? [@[ nestingKeyPath, visitation.keyPath ] componentsJoinedByString:@"."] : visitation.keyPath;
|
|
[self.visitations addObject:visitation];
|
|
}
|
|
|
|
// Update the low value
|
|
NSValue *relationshipKey = [NSValue valueWithNonretainedObject:mapping];
|
|
[self.lowValues setObject:self.numberOfDecriptors forKey:relationshipKey];
|
|
}];
|
|
}
|
|
}
|
|
|
|
@end
|
|
|
|
NSArray *RKArrayOfFetchRequestFromBlocksWithURL(NSArray *fetchRequestBlocks, NSURL *URL)
|
|
{
|
|
NSMutableArray *fetchRequests = [NSMutableArray array];
|
|
NSFetchRequest *fetchRequest = nil;
|
|
for (RKFetchRequestBlock block in [fetchRequestBlocks reverseObjectEnumerator]) {
|
|
fetchRequest = block(URL);
|
|
if (fetchRequest) [fetchRequests addObject:fetchRequest];
|
|
}
|
|
return fetchRequests;
|
|
}
|
|
|
|
static NSSet *RKFlattenCollectionToSet(id collection)
|
|
{
|
|
NSMutableSet *mutableSet = [NSMutableSet set];
|
|
if ([collection conformsToProtocol:@protocol(NSFastEnumeration)]) {
|
|
for (id nestedObject in collection) {
|
|
if ([nestedObject conformsToProtocol:@protocol(NSFastEnumeration)]) {
|
|
if ([nestedObject isKindOfClass:[NSArray class]]) {
|
|
[mutableSet unionSet:RKFlattenCollectionToSet([NSSet setWithArray:nestedObject])];
|
|
} else if ([nestedObject isKindOfClass:[NSSet class]]) {
|
|
[mutableSet unionSet:RKFlattenCollectionToSet(nestedObject)];
|
|
} else if ([nestedObject isKindOfClass:[NSOrderedSet class]]) {
|
|
[mutableSet unionSet:RKFlattenCollectionToSet([(NSOrderedSet *)nestedObject set])];
|
|
}
|
|
} else {
|
|
[mutableSet addObject:nestedObject];
|
|
}
|
|
}
|
|
} else if (collection) {
|
|
[mutableSet addObject:collection];
|
|
}
|
|
|
|
return mutableSet;
|
|
}
|
|
|
|
/**
|
|
Traverses a set of cyclic key paths within the mapping result. Because these relationships are cyclic, we continue collecting managed objects and traversing until the values returned by the key path are a complete subset of all objects already in the set.
|
|
*/
|
|
static void RKAddObjectsInGraphWithCyclicKeyPathsToMutableSet(id graph, NSSet *cyclicKeyPaths, NSMutableSet *mutableSet)
|
|
{
|
|
if ([graph respondsToSelector:@selector(count)] && [graph count] == 0) return;
|
|
|
|
for (NSString *cyclicKeyPath in cyclicKeyPaths) {
|
|
NSSet *objectsAtCyclicKeyPath = RKFlattenCollectionToSet([graph valueForKeyPath:cyclicKeyPath]);
|
|
if ([objectsAtCyclicKeyPath count] == 0 || [objectsAtCyclicKeyPath isEqualToSet:[NSSet setWithObject:[NSNull null]]]) continue;
|
|
if (! [objectsAtCyclicKeyPath isSubsetOfSet:mutableSet]) {
|
|
[mutableSet unionSet:objectsAtCyclicKeyPath];
|
|
for (id nestedValue in objectsAtCyclicKeyPath) {
|
|
RKAddObjectsInGraphWithCyclicKeyPathsToMutableSet(nestedValue, cyclicKeyPaths, mutableSet);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
Returns the set of keys containing the outermost nesting keypath for all children.
|
|
For example, given a set containing: 'this', 'this.that', 'another.one.test', 'another.two.test', 'another.one.test.nested'
|
|
would return: 'this, 'another.one', 'another.two'
|
|
*/
|
|
NSSet *RKSetByRemovingSubkeypathsFromSet(NSSet *setOfKeyPaths);
|
|
NSSet *RKSetByRemovingSubkeypathsFromSet(NSSet *setOfKeyPaths)
|
|
{
|
|
return [setOfKeyPaths objectsPassingTest:^BOOL(NSString *keyPath, BOOL *stop) {
|
|
if ([keyPath isEqual:[NSNull null]]) return YES; // Special case the root key path
|
|
NSArray *keyPathComponents = [keyPath componentsSeparatedByString:@"."];
|
|
NSMutableSet *parentKeyPaths = [NSMutableSet set];
|
|
for (NSUInteger index = 0; index < [keyPathComponents count] - 1; index++) {
|
|
[parentKeyPaths addObject:[[keyPathComponents subarrayWithRange:NSMakeRange(0, index + 1)] componentsJoinedByString:@"."]];
|
|
}
|
|
for (NSString *parentKeyPath in parentKeyPaths) {
|
|
if ([setOfKeyPaths containsObject:parentKeyPath]) return NO;
|
|
}
|
|
return YES;
|
|
}];
|
|
}
|
|
|
|
static void RKSetMappedValueForKeyPathInDictionary(id value, id rootKey, NSString *keyPath, NSMutableDictionary *dictionary)
|
|
{
|
|
NSCParameterAssert(value);
|
|
NSCParameterAssert(rootKey);
|
|
NSCParameterAssert(dictionary);
|
|
if (keyPath && ![keyPath isEqual:[NSNull null]]) {
|
|
id valueAtRootKey = [dictionary objectForKey:rootKey];
|
|
[valueAtRootKey setValue:value forKeyPath:keyPath];
|
|
} else {
|
|
[dictionary setObject:value forKey:rootKey];
|
|
}
|
|
}
|
|
|
|
// Precondition: Must be called from within the correct context
|
|
static NSManagedObject *RKRefetchManagedObjectInContext(NSManagedObject *managedObject, NSManagedObjectContext *managedObjectContext)
|
|
{
|
|
NSManagedObjectID *managedObjectID = [managedObject objectID];
|
|
if (! [managedObject managedObjectContext]) return nil; // Object has been deleted
|
|
if ([managedObjectID isTemporaryID]) {
|
|
RKLogWarning(@"Unable to refetch managed object %@: the object has a temporary managed object ID.", managedObject);
|
|
return managedObject;
|
|
}
|
|
NSError *error = nil;
|
|
NSManagedObject *refetchedObject = [managedObjectContext existingObjectWithID:managedObjectID error:&error];
|
|
NSCAssert(refetchedObject, @"Failed to find existing object with ID %@ in context %@: %@", managedObjectID, managedObjectContext, error);
|
|
return refetchedObject;
|
|
}
|
|
|
|
// Finds the key paths for all entity mappings in the graph whose parent objects are not other managed objects
|
|
static NSDictionary *RKDictionaryFromDictionaryWithManagedObjectsInVisitationsRefetchedInContext(NSDictionary *dictionaryOfManagedObjects, NSArray *visitations, NSManagedObjectContext *managedObjectContext)
|
|
{
|
|
if (! [dictionaryOfManagedObjects count]) return dictionaryOfManagedObjects;
|
|
NSMutableDictionary *newDictionary = [dictionaryOfManagedObjects mutableCopy];
|
|
[managedObjectContext performBlockAndWait:^{
|
|
NSArray *rootKeys = [visitations valueForKey:@"rootKey"];
|
|
for (id rootKey in rootKeys) {
|
|
NSSet *keyPaths = [visitations valueForKey:@"keyPath"];
|
|
// If keyPaths contains null, then the root object is a managed object and we only need to refetch it
|
|
NSSet *nonNestedKeyPaths = ([keyPaths containsObject:[NSNull null]]) ? [NSSet setWithObject:[NSNull null]] : RKSetByRemovingSubkeypathsFromSet(keyPaths);
|
|
|
|
NSDictionary *mappingResultsAtRootKey = [dictionaryOfManagedObjects objectForKey:rootKey];
|
|
for (NSString *keyPath in nonNestedKeyPaths) {
|
|
id value = [keyPath isEqual:[NSNull null]] ? mappingResultsAtRootKey : [mappingResultsAtRootKey valueForKeyPath:keyPath];
|
|
if (! value) {
|
|
continue;
|
|
} else if ([value isKindOfClass:[NSArray class]]) {
|
|
BOOL isMutable = [value isKindOfClass:[NSMutableArray class]];
|
|
NSMutableArray *newValue = [[NSMutableArray alloc] initWithCapacity:[value count]];
|
|
for (__strong id object in value) {
|
|
if ([object isKindOfClass:[NSManagedObject class]]) object = RKRefetchManagedObjectInContext(object, managedObjectContext);
|
|
if (object) [newValue addObject:object];
|
|
}
|
|
value = (isMutable) ? newValue : [newValue copy];
|
|
} else if ([value isKindOfClass:[NSSet class]]) {
|
|
BOOL isMutable = [value isKindOfClass:[NSMutableSet class]];
|
|
NSMutableSet *newValue = [[NSMutableSet alloc] initWithCapacity:[value count]];
|
|
for (__strong id object in value) {
|
|
if ([object isKindOfClass:[NSManagedObject class]]) object = RKRefetchManagedObjectInContext(object, managedObjectContext);
|
|
if (object) [newValue addObject:object];
|
|
}
|
|
value = (isMutable) ? newValue : [newValue copy];
|
|
} else if ([value isKindOfClass:[NSOrderedSet class]]) {
|
|
BOOL isMutable = [value isKindOfClass:[NSMutableOrderedSet class]];
|
|
NSMutableOrderedSet *newValue = [NSMutableOrderedSet orderedSet];
|
|
[(NSOrderedSet *)value enumerateObjectsUsingBlock:^(id object, NSUInteger index, BOOL *stop) {
|
|
if ([object isKindOfClass:[NSManagedObject class]]) object = RKRefetchManagedObjectInContext(object, managedObjectContext);
|
|
if (object) [newValue setObject:object atIndex:index];
|
|
}];
|
|
value = (isMutable) ? newValue : [newValue copy];
|
|
} else if ([value isKindOfClass:[NSManagedObject class]]) {
|
|
value = RKRefetchManagedObjectInContext(value, managedObjectContext);
|
|
}
|
|
|
|
if (value) RKSetMappedValueForKeyPathInDictionary(value, rootKey, keyPath, newDictionary);
|
|
}
|
|
}
|
|
}];
|
|
|
|
return newDictionary;
|
|
}
|
|
|
|
static NSURL *RKRelativeURLFromURLAndResponseDescriptors(NSURL *URL, NSArray *responseDescriptors)
|
|
{
|
|
NSCParameterAssert(URL);
|
|
NSCParameterAssert(responseDescriptors);
|
|
NSArray *baseURLs = [responseDescriptors valueForKeyPath:@"@distinctUnionOfObjects.baseURL"];
|
|
if ([baseURLs count] == 1) {
|
|
NSURL *baseURL = [baseURLs objectAtIndex:0];
|
|
NSString *pathAndQueryString = RKPathAndQueryStringFromURLRelativeToURL(URL, baseURL);
|
|
URL = [NSURL URLWithString:pathAndQueryString relativeToURL:baseURL];
|
|
}
|
|
|
|
return URL;
|
|
}
|
|
|
|
@interface RKManagedObjectRequestOperation ()
|
|
// Core Data specific
|
|
@property (nonatomic, strong) NSManagedObjectContext *privateContext;
|
|
@property (nonatomic, copy) NSManagedObjectID *targetObjectID;
|
|
@property (nonatomic, strong) RKManagedObjectResponseMapperOperation *responseMapperOperation;
|
|
@property (nonatomic, strong, readwrite) NSError *error;
|
|
@property (nonatomic, strong, readwrite) RKMappingResult *mappingResult;
|
|
@property (nonatomic, copy) id (^willMapDeserializedResponseBlock)(id deserializedResponseBody);
|
|
@end
|
|
|
|
@implementation RKManagedObjectRequestOperation
|
|
|
|
@dynamic willMapDeserializedResponseBlock;
|
|
|
|
// Designated initializer
|
|
- (id)initWithHTTPRequestOperation:(RKHTTPRequestOperation *)requestOperation responseDescriptors:(NSArray *)responseDescriptors
|
|
{
|
|
self = [super initWithHTTPRequestOperation:requestOperation responseDescriptors:responseDescriptors];
|
|
if (self) {
|
|
self.savesToPersistentStore = YES;
|
|
self.deletesOrphanedObjects = YES;
|
|
}
|
|
return self;
|
|
}
|
|
|
|
- (void)setTargetObject:(id)targetObject
|
|
{
|
|
[super setTargetObject:targetObject];
|
|
|
|
if ([targetObject isKindOfClass:[NSManagedObject class]]) {
|
|
self.targetObjectID = [targetObject objectID];
|
|
}
|
|
}
|
|
|
|
- (void)setManagedObjectContext:(NSManagedObjectContext *)managedObjectContext
|
|
{
|
|
_managedObjectContext = managedObjectContext;
|
|
|
|
if (managedObjectContext) {
|
|
// Create a private context
|
|
NSManagedObjectContext *privateContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];
|
|
[privateContext performBlockAndWait:^{
|
|
privateContext.parentContext = managedObjectContext;
|
|
privateContext.mergePolicy = NSMergeByPropertyStoreTrumpMergePolicy;
|
|
}];
|
|
self.privateContext = privateContext;
|
|
} else {
|
|
self.privateContext = nil;
|
|
}
|
|
}
|
|
|
|
#pragma mark - RKObjectRequestOperation Overrides
|
|
|
|
- (void)cancel
|
|
{
|
|
[super cancel];
|
|
[self.responseMapperOperation cancel];
|
|
}
|
|
|
|
- (RKMappingResult *)performMappingOnResponse:(NSError **)error
|
|
{
|
|
if (self.HTTPRequestOperation.wasNotModified) {
|
|
RKLogDebug(@"Managed object mapping requested for cached response: skipping mapping...");
|
|
NSURL *URL = RKRelativeURLFromURLAndResponseDescriptors(self.HTTPRequestOperation.response.URL, self.responseDescriptors);
|
|
NSArray *fetchRequests = RKArrayOfFetchRequestFromBlocksWithURL(self.fetchRequestBlocks, URL);
|
|
NSMutableArray *managedObjects = [NSMutableArray array];
|
|
[self.privateContext performBlockAndWait:^{
|
|
NSError *error = nil;
|
|
for (NSFetchRequest *fetchRequest in fetchRequests) {
|
|
NSArray *fetchedObjects = [self.privateContext executeFetchRequest:fetchRequest error:&error];
|
|
if (fetchedObjects) {
|
|
[managedObjects addObjectsFromArray:fetchedObjects];
|
|
} else {
|
|
RKLogError(@"Failed to execute fetch request %@: %@", fetchRequest, error);
|
|
}
|
|
}
|
|
}];
|
|
return [[RKMappingResult alloc] initWithDictionary:@{ [NSNull null]: managedObjects }];
|
|
}
|
|
|
|
self.responseMapperOperation = [[RKManagedObjectResponseMapperOperation alloc] initWithResponse:self.HTTPRequestOperation.response
|
|
data:self.HTTPRequestOperation.responseData
|
|
responseDescriptors:self.responseDescriptors];
|
|
self.responseMapperOperation.mapperDelegate = self;
|
|
self.responseMapperOperation.targetObjectID = self.targetObjectID;
|
|
self.responseMapperOperation.managedObjectContext = self.privateContext;
|
|
self.responseMapperOperation.managedObjectCache = self.managedObjectCache;
|
|
[self.responseMapperOperation setWillMapDeserializedResponseBlock:self.willMapDeserializedResponseBlock];
|
|
[self.responseMapperOperation setQueuePriority:[self queuePriority]];
|
|
[[RKObjectRequestOperation responseMappingQueue] addOperation:self.responseMapperOperation];
|
|
[self.responseMapperOperation waitUntilFinished];
|
|
if ([self isCancelled]) return nil;
|
|
if (self.responseMapperOperation.error) {
|
|
if (error) *error = self.responseMapperOperation.error;
|
|
return nil;
|
|
}
|
|
|
|
return self.responseMapperOperation.mappingResult;
|
|
}
|
|
|
|
- (BOOL)deleteTargetObjectIfAppropriate:(NSError **)error
|
|
{
|
|
__block BOOL _blockSuccess = YES;
|
|
|
|
if (self.targetObjectID
|
|
&& NSLocationInRange(self.HTTPRequestOperation.response.statusCode, RKStatusCodeRangeForClass(RKStatusCodeClassSuccessful))
|
|
&& [[[self.HTTPRequestOperation.request HTTPMethod] uppercaseString] isEqualToString:@"DELETE"]) {
|
|
|
|
// 2xx DELETE request, proceed with deletion from the MOC
|
|
__block NSError *_blockError = nil;
|
|
[self.privateContext performBlockAndWait:^{
|
|
NSManagedObject *backgroundThreadObject = [self.privateContext existingObjectWithID:self.targetObjectID error:&_blockError];
|
|
if (backgroundThreadObject) {
|
|
RKLogInfo(@"Deleting local object %@ due to `DELETE` request", backgroundThreadObject);
|
|
[self.privateContext deleteObject:backgroundThreadObject];
|
|
} else {
|
|
RKLogWarning(@"Unable to delete object sent with `DELETE` request: Failed to retrieve object with objectID %@", self.targetObjectID);
|
|
RKLogCoreDataError(_blockError);
|
|
_blockSuccess = NO;
|
|
*error = _blockError;
|
|
}
|
|
}];
|
|
}
|
|
|
|
return _blockSuccess;
|
|
}
|
|
|
|
- (NSSet *)localObjectsFromFetchRequestsMatchingRequestURL:(NSError **)error
|
|
{
|
|
NSMutableSet *localObjects = [NSMutableSet set];
|
|
__block NSError *_blockError;
|
|
__block NSArray *_blockObjects;
|
|
|
|
// Pass the fetch request blocks a relative `NSURL` object if possible
|
|
NSURL *URL = RKRelativeURLFromURLAndResponseDescriptors(self.HTTPRequestOperation.response.URL, self.responseDescriptors);
|
|
for (RKFetchRequestBlock fetchRequestBlock in [self.fetchRequestBlocks reverseObjectEnumerator]) {
|
|
NSFetchRequest *fetchRequest = fetchRequestBlock(URL);
|
|
if (fetchRequest) {
|
|
RKLogDebug(@"Found fetch request matching URL '%@': %@", URL, fetchRequest);
|
|
|
|
[self.privateContext performBlockAndWait:^{
|
|
_blockObjects = [self.privateContext executeFetchRequest:fetchRequest error:&_blockError];
|
|
}];
|
|
|
|
if (_blockObjects == nil) {
|
|
if (error) *error = _blockError;
|
|
return nil;
|
|
}
|
|
RKLogTrace(@"Fetched local objects matching URL '%@' with fetch request '%@': %@", URL, fetchRequest, _blockObjects);
|
|
[localObjects addObjectsFromArray:_blockObjects];
|
|
} else {
|
|
RKLogDebug(@"Fetch request block %@ returned nil fetch request for URL: '%@'", fetchRequestBlock, URL);
|
|
}
|
|
}
|
|
|
|
return localObjects;
|
|
}
|
|
|
|
- (BOOL)deleteLocalObjectsMissingFromMappingResult:(RKMappingResult *)result withVisitor:(RKNestedManagedObjectKeyPathMappingGraphVisitor *)visitor error:(NSError **)error
|
|
{
|
|
if (! self.deletesOrphanedObjects) {
|
|
RKLogDebug(@"Skipping deletion of orphaned objects: disabled as deletesOrphanedObjects=NO");
|
|
return YES;
|
|
}
|
|
|
|
if (! [[self.HTTPRequestOperation.request.HTTPMethod uppercaseString] isEqualToString:@"GET"]) {
|
|
RKLogDebug(@"Skipping deletion of orphaned objects: only performed for GET requests.");
|
|
return YES;
|
|
}
|
|
|
|
if (self.HTTPRequestOperation.wasNotModified) {
|
|
RKLogDebug(@"Skipping deletion of orphaned objects: 304 (Not Modified) status code encountered");
|
|
return YES;
|
|
}
|
|
|
|
// Build an aggregate collection of all the managed objects in the mapping result
|
|
NSMutableSet *managedObjectsInMappingResult = [NSMutableSet set];
|
|
NSDictionary *mappingResultDictionary = result.dictionary;
|
|
|
|
for (RKMappingGraphVisitation *visitation in visitor.visitations) {
|
|
id objectsAtRoot = [mappingResultDictionary objectForKey:visitation.rootKey];
|
|
id managedObjects = visitation.keyPath ? [objectsAtRoot valueForKeyPath:visitation.keyPath] : objectsAtRoot;
|
|
[managedObjectsInMappingResult unionSet:RKFlattenCollectionToSet(managedObjects)];
|
|
|
|
if (visitation.isCyclic) {
|
|
NSSet *cyclicKeyPaths = [NSSet setWithArray:[visitation valueForKeyPath:@"mapping.relationshipMappings.destinationKeyPath"]];
|
|
[managedObjectsInMappingResult unionSet:RKFlattenCollectionToSet(managedObjects)];
|
|
RKAddObjectsInGraphWithCyclicKeyPathsToMutableSet(managedObjects, cyclicKeyPaths, managedObjectsInMappingResult);
|
|
}
|
|
}
|
|
|
|
NSSet *localObjects = [self localObjectsFromFetchRequestsMatchingRequestURL:error];
|
|
if (! localObjects) return NO;
|
|
RKLogDebug(@"Checking mappings result of %ld objects for %ld potentially orphaned local objects...", (long) [managedObjectsInMappingResult count], (long) [localObjects count]);
|
|
for (id object in localObjects) {
|
|
if (NO == [managedObjectsInMappingResult containsObject:object]) {
|
|
RKLogDebug(@"Deleting orphaned object %@: not found in result set and expected at this URL", object);
|
|
[self.privateContext performBlockAndWait:^{
|
|
[self.privateContext deleteObject:object];
|
|
}];
|
|
}
|
|
}
|
|
|
|
return YES;
|
|
}
|
|
|
|
- (BOOL)saveContext:(NSError **)error
|
|
{
|
|
__block BOOL success = YES;
|
|
__block NSError *localError = nil;
|
|
if ([self.privateContext hasChanges]) {
|
|
if (self.savesToPersistentStore) {
|
|
success = [self.privateContext saveToPersistentStore:&localError];
|
|
} else {
|
|
[self.privateContext performBlockAndWait:^{
|
|
success = [self.privateContext save:&localError];
|
|
}];
|
|
}
|
|
if (success) {
|
|
if ([self.targetObject isKindOfClass:[NSManagedObject class]]) {
|
|
[self.managedObjectContext performBlock:^{
|
|
RKLogDebug(@"Refreshing mapped target object %@ in context %@", self.targetObject, self.managedObjectContext);
|
|
[self.managedObjectContext refreshObject:self.targetObject mergeChanges:YES];
|
|
}];
|
|
}
|
|
} else {
|
|
if (error) *error = localError;
|
|
RKLogError(@"Failed saving managed object context %@ %@", (self.savesToPersistentStore ? @"to the persistent store" : @""), self.privateContext);
|
|
RKLogCoreDataError(localError);
|
|
}
|
|
}
|
|
|
|
return success;
|
|
}
|
|
|
|
- (BOOL)obtainPermanentObjectIDsForInsertedObjects:(NSError **)error
|
|
{
|
|
__block BOOL _blockSuccess = YES;
|
|
__block NSError *localError = nil;
|
|
NSArray *insertedObjects = [self.privateContext.insertedObjects allObjects];
|
|
if ([insertedObjects count] > 0) {
|
|
RKLogDebug(@"Obtaining permanent ID's for %ld managed objects", (unsigned long) [insertedObjects count]);
|
|
[self.privateContext performBlockAndWait:^{
|
|
_blockSuccess = [self.privateContext obtainPermanentIDsForObjects:insertedObjects error:&localError];
|
|
}];
|
|
if (!_blockSuccess && error) *error = localError;
|
|
}
|
|
|
|
return _blockSuccess;;
|
|
}
|
|
|
|
- (void)willFinish
|
|
{
|
|
BOOL success;
|
|
NSError *error = nil;
|
|
|
|
// Construct a set of key paths to all of the managed objects in the mapping result
|
|
RKNestedManagedObjectKeyPathMappingGraphVisitor *visitor = [[RKNestedManagedObjectKeyPathMappingGraphVisitor alloc] initWithResponseDescriptors:self.responseDescriptors];
|
|
|
|
// Handle any cleanup
|
|
success = [self deleteTargetObjectIfAppropriate:&error];
|
|
if (! success) {
|
|
self.error = error;
|
|
return;
|
|
}
|
|
|
|
success = [self deleteLocalObjectsMissingFromMappingResult:self.mappingResult withVisitor:visitor error:&error];
|
|
if (! success) {
|
|
self.error = error;
|
|
return;
|
|
}
|
|
|
|
// Persist our mapped objects
|
|
success = [self obtainPermanentObjectIDsForInsertedObjects:&error];
|
|
if (! success) {
|
|
self.error = error;
|
|
return;
|
|
}
|
|
success = [self saveContext:&error];
|
|
if (! success) self.error = error;
|
|
|
|
// Refetch all managed objects nested at key paths within the results dictionary before returning
|
|
if (self.mappingResult) {
|
|
NSDictionary *resultsDictionaryFromOriginalContext = RKDictionaryFromDictionaryWithManagedObjectsInVisitationsRefetchedInContext([self.mappingResult dictionary], visitor.visitations, self.managedObjectContext);
|
|
self.mappingResult = [[RKMappingResult alloc] initWithDictionary:resultsDictionaryFromOriginalContext];
|
|
}
|
|
}
|
|
|
|
@end
|