mirror of
https://github.com/zhigang1992/RestKit.git
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f3c0995d5e
* Removed RestKit from inheritance hierarchy * Mappings are implemented as concrete classes * Mapper is much more flexible & powerful * Much more robust error handling * Serialization is reimplemented as an object mapping operation * Added ability to serialize to JSON natively * Reworked Core Data integration * Simplified the codebase substantially
74 lines
3.6 KiB
Objective-C
74 lines
3.6 KiB
Objective-C
//
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// RKManagedObjectMappingOperation.m
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// RestKit
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//
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// Created by Blake Watters on 5/31/11.
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// Copyright 2011 Two Toasters. All rights reserved.
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//
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#import "RKManagedObjectMappingOperation.h"
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#import "RKManagedObjectMapping.h"
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#import "NSManagedObject+ActiveRecord.h"
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/**
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Progressively enhance the RKObjectMappingOperation base class to inject Core Data
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specifics without leaking into the object mapper abstractions
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*/
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@implementation RKObjectMappingOperation (CoreData)
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/*
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Trampoline the initialization through RKManagedObjectMapping so the mapper uses RKManagedObjectMappingOperation
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at the right moments
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*/
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+ (RKObjectMappingOperation*)mappingOperationFromObject:(id)sourceObject toObject:(id)destinationObject withObjectMapping:(RKObjectMapping*)objectMapping {
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if ([objectMapping isKindOfClass:[RKManagedObjectMapping class]]) {
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return [[[RKManagedObjectMappingOperation alloc] initWithSourceObject:sourceObject destinationObject:destinationObject objectMapping:objectMapping] autorelease];
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}
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return [[[RKObjectMappingOperation alloc] initWithSourceObject:sourceObject destinationObject:destinationObject objectMapping:objectMapping] autorelease];
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}
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@end
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@implementation RKManagedObjectMappingOperation
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// TODO: Move this to a better home to take exposure out of the mapper
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- (Class)operationClassForMapping:(RKObjectMapping*)mapping {
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Class managedMappingClass = NSClassFromString(@"RKManagedObjectMapping");
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Class managedMappingOperationClass = NSClassFromString(@"RKManagedObjectMappingOperation");
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if (managedMappingClass != nil && [mapping isMemberOfClass:managedMappingClass]) {
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return managedMappingOperationClass;
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}
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return [RKObjectMappingOperation class];
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}
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- (void)connectRelationships {
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if ([self.objectMapping isKindOfClass:[RKManagedObjectMapping class]]) {
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NSDictionary* relationshipsAndPrimaryKeyAttributes = [(RKManagedObjectMapping*)self.objectMapping relationshipsAndPrimaryKeyAttributes];
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for (NSString* relationshipName in relationshipsAndPrimaryKeyAttributes) {
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NSString* primaryKeyAttribute = [relationshipsAndPrimaryKeyAttributes objectForKey:relationshipName];
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RKObjectRelationshipMapping* mapping = [self.objectMapping mappingForKeyPath:relationshipName];
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NSAssert(mapping, @"Unable to find relationship mapping '%@' to connect by primaryKey", relationshipName);
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NSAssert([mapping isKindOfClass:[RKObjectRelationshipMapping class]], @"Expected mapping for %@ to be a relationship mapping", relationshipName);
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NSAssert([mapping.objectMapping isKindOfClass:[RKManagedObjectMapping class]], @"Can only connect RKManagedObjectMapping relationships");
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NSString* primaryKeyAttributeOfRelatedObject = [(RKManagedObjectMapping*)mapping.objectMapping primaryKeyAttribute];
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NSAssert(primaryKeyAttributeOfRelatedObject, @"Cannot connect relationship: mapping for %@ has no primary key attribute specified", NSStringFromClass(mapping.objectMapping.objectClass));
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id valueOfLocalPrimaryKeyAttribute = [self.destinationObject valueForKey:primaryKeyAttribute];
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if (valueOfLocalPrimaryKeyAttribute) {
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id relatedObject = [mapping.objectMapping.objectClass findFirstByAttribute:primaryKeyAttributeOfRelatedObject withValue:valueOfLocalPrimaryKeyAttribute];
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[self.destinationObject setValue:relatedObject forKey:relationshipName];
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// TODO: Logging
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}
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}
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}
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}
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- (BOOL)performMapping:(NSError**)error {
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BOOL success = [super performMapping:error];
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[self connectRelationships];
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return success;
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}
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@end
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