mirror of
https://github.com/zhigang1992/RestKit.git
synced 2026-01-12 22:51:50 +08:00
Refactored relationship mapping implementation to make it easier to follow and debug
This commit is contained in:
Blake Watters
@@ -66,6 +66,12 @@ static void RKSetIntermediateDictionaryValuesOnObjectForKeyPath(id object, NSStr
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}
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}
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static BOOL RKIsManagedObject(id object)
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{
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Class managedObjectClass = NSClassFromString(@"NSManagedObject");
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return managedObjectClass && [object isKindOfClass:managedObjectClass];
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}
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@implementation RKMappingOperation
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- (id)initWithSourceObject:(id)sourceObject destinationObject:(id)destinationObject mapping:(RKMapping *)objectOrDynamicMapping
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@@ -422,10 +428,104 @@ static void RKSetIntermediateDictionaryValuesOnObjectForKeyPath(id object, NSStr
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return YES;
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}
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- (BOOL)mapOneToOneRelationshipWithValue:(id)value mapping:(RKRelationshipMapping *)relationshipMapping
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{
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// One to one relationship
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RKLogDebug(@"Mapping one to one relationship value at keyPath '%@' to '%@'", relationshipMapping.sourceKeyPath, relationshipMapping.destinationKeyPath);
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id destinationObject = [self destinationObjectForMappingRepresentation:value withMapping:relationshipMapping.mapping];
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if (! destinationObject) {
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RKLogDebug(@"Mapping %@ declined mapping for representation %@: returned `nil` destination object.", relationshipMapping.mapping, destinationObject);
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return NO;
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}
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[self mapNestedObject:value toObject:destinationObject withRelationshipMapping:relationshipMapping];
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// If the relationship has changed, set it
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if ([self shouldSetValue:&destinationObject atKeyPath:relationshipMapping.destinationKeyPath]) {
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RKLogTrace(@"Mapped relationship object from keyPath '%@' to '%@'. Value: %@", relationshipMapping.sourceKeyPath, relationshipMapping.destinationKeyPath, destinationObject);
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[self.destinationObject setValue:destinationObject forKey:relationshipMapping.destinationKeyPath];
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} else {
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if ([self.delegate respondsToSelector:@selector(mappingOperation:didNotSetUnchangedValue:forKeyPath:usingMapping:)]) {
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[self.delegate mappingOperation:self didNotSetUnchangedValue:destinationObject forKeyPath:relationshipMapping.destinationKeyPath usingMapping:relationshipMapping];
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}
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}
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return YES;
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}
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- (BOOL)mapCoreDataToManyRelationshipValue:(id)valueForRelationship withMapping:(RKRelationshipMapping *)relationshipMapping
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{
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if (! RKIsManagedObject(self.destinationObject)) return NO;
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RKLogTrace(@"Mapping a to-many relationship for an `NSManagedObject`. About to apply value via mutable[Set|Array]ValueForKey");
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if ([valueForRelationship isKindOfClass:[NSSet class]]) {
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RKLogTrace(@"Mapped `NSSet` relationship object from keyPath '%@' to '%@'. Value: %@", relationshipMapping.sourceKeyPath, relationshipMapping.destinationKeyPath, valueForRelationship);
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NSMutableSet *destinationSet = [self.destinationObject mutableSetValueForKeyPath:relationshipMapping.destinationKeyPath];
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[destinationSet setSet:valueForRelationship];
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} else if ([valueForRelationship isKindOfClass:[NSArray class]]) {
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RKLogTrace(@"Mapped `NSArray` relationship object from keyPath '%@' to '%@'. Value: %@", relationshipMapping.sourceKeyPath, relationshipMapping.destinationKeyPath, valueForRelationship);
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NSMutableArray *destinationArray = [self.destinationObject mutableArrayValueForKeyPath:relationshipMapping.destinationKeyPath];
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[destinationArray setArray:valueForRelationship];
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} else if ([valueForRelationship isKindOfClass:[NSOrderedSet class]]) {
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RKLogTrace(@"Mapped `NSOrderedSet` relationship object from keyPath '%@' to '%@'. Value: %@", relationshipMapping.sourceKeyPath, relationshipMapping.destinationKeyPath, valueForRelationship);
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[self.destinationObject setValue:valueForRelationship forKeyPath:relationshipMapping.destinationKeyPath];
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}
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return YES;
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}
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- (BOOL)mapOneToManyRelationshipWithValue:(id)value mapping:(RKRelationshipMapping *)relationshipMapping
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{
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// One to many relationship
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RKLogDebug(@"Mapping one to many relationship value at keyPath '%@' to '%@'", relationshipMapping.sourceKeyPath, relationshipMapping.destinationKeyPath);
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NSMutableArray *relationshipCollection = [NSMutableArray arrayWithCapacity:[value count]];
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id collectionSanityCheckObject = nil;
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if ([value respondsToSelector:@selector(anyObject)]) collectionSanityCheckObject = [value anyObject];
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if ([value respondsToSelector:@selector(lastObject)]) collectionSanityCheckObject = [value lastObject];
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if (RKObjectIsCollection(collectionSanityCheckObject)) {
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RKLogWarning(@"WARNING: Detected a relationship mapping for a collection containing another collection. This is probably not what you want. Consider using a KVC collection operator (such as @unionOfArrays) to flatten your mappable collection.");
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RKLogWarning(@"Key path '%@' yielded collection containing another collection rather than a collection of objects: %@", relationshipMapping.sourceKeyPath, value);
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}
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for (id nestedObject in value) {
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id mappableObject = [self destinationObjectForMappingRepresentation:nestedObject withMapping:relationshipMapping.mapping];
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if (! mappableObject) {
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RKLogDebug(@"Mapping %@ declined mapping for representation %@: returned `nil` destination object.", relationshipMapping.mapping, nestedObject);
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continue;
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}
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if ([self mapNestedObject:nestedObject toObject:mappableObject withRelationshipMapping:relationshipMapping]) {
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[relationshipCollection addObject:mappableObject];
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}
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}
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id valueForRelationship = relationshipCollection;
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// Transform from NSSet <-> NSArray if necessary
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Class type = [self.objectMapping classForKeyPath:relationshipMapping.destinationKeyPath];
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if (type && NO == [[relationshipCollection class] isSubclassOfClass:type]) {
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valueForRelationship = [self transformValue:relationshipCollection atKeyPath:relationshipMapping.sourceKeyPath toType:type];
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}
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// If the relationship has changed, set it
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if ([self shouldSetValue:&valueForRelationship atKeyPath:relationshipMapping.destinationKeyPath]) {
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if (! [self mapCoreDataToManyRelationshipValue:valueForRelationship withMapping:relationshipMapping]) {
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RKLogTrace(@"Mapped relationship object from keyPath '%@' to '%@'. Value: %@", relationshipMapping.sourceKeyPath, relationshipMapping.destinationKeyPath, valueForRelationship);
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[self.destinationObject setValue:valueForRelationship forKeyPath:relationshipMapping.destinationKeyPath];
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}
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} else {
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if ([self.delegate respondsToSelector:@selector(mappingOperation:didNotSetUnchangedValue:forKeyPath:usingMapping:)]) {
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[self.delegate mappingOperation:self didNotSetUnchangedValue:valueForRelationship forKeyPath:relationshipMapping.destinationKeyPath usingMapping:relationshipMapping];
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}
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return NO;
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}
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return YES;
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}
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- (BOOL)applyRelationshipMappings
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{
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NSAssert(self.dataSource, @"Cannot perform relationship mapping without a data source");
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BOOL appliedMappings = NO;
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NSMutableArray *mappingsApplied = [NSMutableArray array];
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id destinationObject = nil;
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for (RKRelationshipMapping *relationshipMapping in [self relationshipMappings]) {
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@@ -443,6 +543,9 @@ static void RKSetIntermediateDictionaryValuesOnObjectForKeyPath(id object, NSStr
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@throw;
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}
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// Track that we applied this mapping
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[mappingsApplied addObject:relationshipMapping];
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if (value == nil) {
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RKLogDebug(@"Did not find mappable relationship value keyPath '%@'", relationshipMapping.sourceKeyPath);
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@@ -502,90 +605,15 @@ static void RKSetIntermediateDictionaryValuesOnObjectForKeyPath(id object, NSStr
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}
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}
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BOOL setValueForRelationship;
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if (RKObjectIsCollection(value)) {
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// One to many relationship
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RKLogDebug(@"Mapping one to many relationship value at keyPath '%@' to '%@'", relationshipMapping.sourceKeyPath, relationshipMapping.destinationKeyPath);
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appliedMappings = YES;
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destinationObject = [NSMutableArray arrayWithCapacity:[value count]];
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id collectionSanityCheckObject = nil;
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if ([value respondsToSelector:@selector(anyObject)]) collectionSanityCheckObject = [value anyObject];
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if ([value respondsToSelector:@selector(lastObject)]) collectionSanityCheckObject = [value lastObject];
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if (RKObjectIsCollection(collectionSanityCheckObject)) {
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RKLogWarning(@"WARNING: Detected a relationship mapping for a collection containing another collection. This is probably not what you want. Consider using a KVC collection operator (such as @unionOfArrays) to flatten your mappable collection.");
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RKLogWarning(@"Key path '%@' yielded collection containing another collection rather than a collection of objects: %@", relationshipMapping.sourceKeyPath, value);
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}
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for (id nestedObject in value) {
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id mappableObject = [self destinationObjectForMappingRepresentation:nestedObject withMapping:relationshipMapping.mapping];
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if (! mappableObject) {
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RKLogDebug(@"Mapping %@ declined mapping for representation %@: returned `nil` destination object.", relationshipMapping.mapping, nestedObject);
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continue;
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}
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if ([self mapNestedObject:nestedObject toObject:mappableObject withRelationshipMapping:relationshipMapping]) {
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[destinationObject addObject:mappableObject];
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}
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}
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// Transform from NSSet <-> NSArray if necessary
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Class type = [self.objectMapping classForKeyPath:relationshipMapping.destinationKeyPath];
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if (type && NO == [[destinationObject class] isSubclassOfClass:type]) {
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destinationObject = [self transformValue:destinationObject atKeyPath:relationshipMapping.sourceKeyPath toType:type];
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}
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// If the relationship has changed, set it
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if ([self shouldSetValue:&destinationObject atKeyPath:relationshipMapping.destinationKeyPath]) {
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Class managedObjectClass = NSClassFromString(@"NSManagedObject");
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Class nsOrderedSetClass = NSClassFromString(@"NSOrderedSet");
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if (managedObjectClass && [self.destinationObject isKindOfClass:managedObjectClass]) {
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RKLogTrace(@"Found a managedObject collection. About to apply value via mutable[Set|Array]ValueForKey");
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if ([destinationObject isKindOfClass:[NSSet class]]) {
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RKLogTrace(@"Mapped NSSet relationship object from keyPath '%@' to '%@'. Value: %@", relationshipMapping.sourceKeyPath, relationshipMapping.destinationKeyPath, destinationObject);
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NSMutableSet *destinationSet = [self.destinationObject mutableSetValueForKeyPath:relationshipMapping.destinationKeyPath];
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if ([relationshipMapping.destinationKeyPath isEqualToString:@"departureAirport.checkpoints"]) {
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}
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[destinationSet setSet:destinationObject];
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} else if ([destinationObject isKindOfClass:[NSArray class]]) {
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RKLogTrace(@"Mapped NSArray relationship object from keyPath '%@' to '%@'. Value: %@", relationshipMapping.sourceKeyPath, relationshipMapping.destinationKeyPath, destinationObject);
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NSMutableArray *destinationArray = [self.destinationObject mutableArrayValueForKeyPath:relationshipMapping.destinationKeyPath];
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[destinationArray setArray:destinationObject];
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} else if (nsOrderedSetClass && [destinationObject isKindOfClass:nsOrderedSetClass]) {
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RKLogTrace(@"Mapped NSOrderedSet relationship object from keyPath '%@' to '%@'. Value: %@", relationshipMapping.sourceKeyPath, relationshipMapping.destinationKeyPath, destinationObject);
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[self.destinationObject setValue:destinationObject forKeyPath:relationshipMapping.destinationKeyPath];
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}
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} else {
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RKLogTrace(@"Mapped relationship object from keyPath '%@' to '%@'. Value: %@", relationshipMapping.sourceKeyPath, relationshipMapping.destinationKeyPath, destinationObject);
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[self.destinationObject setValue:destinationObject forKeyPath:relationshipMapping.destinationKeyPath];
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}
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} else {
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if ([self.delegate respondsToSelector:@selector(mappingOperation:didNotSetUnchangedValue:forKeyPath:usingMapping:)]) {
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[self.delegate mappingOperation:self didNotSetUnchangedValue:destinationObject forKeyPath:relationshipMapping.destinationKeyPath usingMapping:relationshipMapping];
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}
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}
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setValueForRelationship = [self mapOneToManyRelationshipWithValue:value mapping:relationshipMapping];
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} else {
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// One to one relationship
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RKLogDebug(@"Mapping one to one relationship value at keyPath '%@' to '%@'", relationshipMapping.sourceKeyPath, relationshipMapping.destinationKeyPath);
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destinationObject = [self destinationObjectForMappingRepresentation:value withMapping:relationshipMapping.mapping];
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if (! destinationObject) {
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RKLogDebug(@"Mapping %@ declined mapping for representation %@: returned `nil` destination object.", relationshipMapping.mapping, destinationObject);
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continue;
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}
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if ([self mapNestedObject:value toObject:destinationObject withRelationshipMapping:relationshipMapping]) {
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appliedMappings = YES;
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}
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// If the relationship has changed, set it
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if ([self shouldSetValue:&destinationObject atKeyPath:relationshipMapping.destinationKeyPath]) {
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appliedMappings = YES;
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RKLogTrace(@"Mapped relationship object from keyPath '%@' to '%@'. Value: %@", relationshipMapping.sourceKeyPath, relationshipMapping.destinationKeyPath, destinationObject);
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[self.destinationObject setValue:destinationObject forKey:relationshipMapping.destinationKeyPath];
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} else {
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if ([self.delegate respondsToSelector:@selector(mappingOperation:didNotSetUnchangedValue:forKeyPath:usingMapping:)]) {
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[self.delegate mappingOperation:self didNotSetUnchangedValue:destinationObject forKeyPath:relationshipMapping.destinationKeyPath usingMapping:relationshipMapping];
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}
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}
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setValueForRelationship = [self mapOneToOneRelationshipWithValue:value mapping:relationshipMapping];
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}
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if (! setValueForRelationship) continue;
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// Notify the delegate
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if ([self.delegate respondsToSelector:@selector(mappingOperation:didSetValue:forKeyPath:usingMapping:)]) {
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[self.delegate mappingOperation:self didSetValue:destinationObject forKeyPath:relationshipMapping.destinationKeyPath usingMapping:relationshipMapping];
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@@ -597,7 +625,7 @@ static void RKSetIntermediateDictionaryValuesOnObjectForKeyPath(id object, NSStr
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}
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}
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return appliedMappings;
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return [mappingsApplied count] > 0;
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}
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- (void)applyNestedMappings
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