SMMangedObject meta

gistfile1.m

//Automagic default implementation
- (NSString *)JSONKeyForObjectKeyPath:(NSString *)keyPath {
    
    //Anything in the model for an override?
    NSAttributeDescription *attribute = [self.entity.attributesByName objectForKey:keyPath];
    NSString *jsonKey = [[attribute userInfo] objectForKey:@"JSONKey"];
    if (jsonKey)
        return  jsonKey;
    
    if ([keyPath isEqualToString:@"uuid"])
        return @"id";
    
    if ([keyPath isEqualToString:@"dateTime"])
        return @"datetime";
    
    NSMutableString *retval = [NSMutableString stringWithCapacity:32];
    
    NSScanner *scanner = [NSScanner scannerWithString:keyPath];
    scanner.caseSensitive = YES;
    
    NSString *buffer = nil;
    while ([scanner isAtEnd] == NO) {
        
        if ([scanner scanCharactersFromSet:[[NSCharacterSet uppercaseLetterCharacterSet] invertedSet] intoString:&buffer]) {
            
            [retval appendString:buffer];
            
            if ([scanner scanCharactersFromSet:[NSCharacterSet uppercaseLetterCharacterSet] intoString:&buffer]) {
                if ([buffer isEqualToString:@"UUID"]) {
                    [retval appendString:@"_id"];
                }
                else {
                    [retval appendFormat:@"_%@",[buffer lowercaseString]];
                }
            }
        }
    }
    
    return retval;
}

//Automagic default implementation
- (NSString *) JSONResource {
    NSString *jsonResource = [self.entity.userInfo objectForKey:@"JSONResource"];
    if (!jsonResource) {
        jsonResource = [NSString stringWithFormat:@"%@",[self class]];
    }
    
    if ([jsonResource hasPrefix:@"SM"])
    {
        jsonResource = [jsonResource substringFromIndex:2];
    }
    
    return jsonResource;
}

//Automagic default implementation 
- (NSDictionary *) JSONDictionary {
    NSMutableDictionary *dictionary = [NSMutableDictionary dictionaryWithCapacity:[self.entity.properties count]]; 
    [dictionary setObject:[NSString stringWithFormat:@"%@",[self class]] forKey:@"_entity"];
    [dictionary setObject:[self JSONResource] forKey:@"_resource"];
    for (NSPropertyDescription *property in self.entity.properties) {
        if ([property isKindOfClass:[NSAttributeDescription class]])
        {
            NSString *jsonKey = [self JSONKeyForObjectKeyPath:property.name];
            if (!jsonKey) 
                continue;
            
            id value = [self valueForKey:property.name];
            if (!value) {
                value = [NSNull null];
            }
            
            if ([value isKindOfClass:[NSDate class]]) {
                value = [[NSCalendar ISO8601DateFormatter] stringFromDate:value];
            }
            
            [dictionary setObject:value forKey:jsonKey];
        }
        else if ([property isKindOfClass:[NSRelationshipDescription class]])
        {
            NSRelationshipDescription *relationship = (NSRelationshipDescription *)property;
           
            if (![relationship isToMany]){
                NSManagedObject *value = [self valueForKey:property.name];
                if (value && [value isKindOfClass:[SMManagedObject class]])
                {
                    SMManagedObject *object = (SMManagedObject *)value;
                    if ([object.entity.propertiesByName objectForKey:@"uuid"])
                    {
                        NSString *jsonKey = [[self JSONKeyForObjectKeyPath:property.name] stringByAppendingString:@"_id"];
                        [dictionary setObject:object.primitiveUuid forKey:jsonKey];
                    }
                }
            }
            else {
                NSSet *value;
                if ([relationship isOrdered]) {
                    value = [(NSOrderedSet *)[self valueForKey:property.name] set];
                }
                else {
                    value = (NSSet*)[self valueForKey:property.name];
                }
                
                NSString *jsonKey = [self JSONKeyForObjectKeyPath:property.name];
                NSMutableArray *values = [NSMutableArray array];
                if (value)
                {
                    for (SMManagedObject *object in value) {
                        if ([object.entity.propertiesByName objectForKey:@"uuid"])
                        {
                            [values addObject:object.primitiveUuid];
                        }
                    }
                }
                [dictionary setObject:values forKey:jsonKey];
            }
        }
    }
    return [dictionary copy];
}

- (NSDictionary *)JSONChangeSet
{
    NSMutableDictionary *changeset = [NSMutableDictionary dictionary];
    
    NSDictionary *jsondict = [self JSONDictionary];
    [changeset setObject:[jsondict objectForKey:@"_entity"] forKey:@"_entity"];
    [changeset setObject:[jsondict objectForKey:@"_resource"] forKey:@"_resource"];
    [changeset setObject:[jsondict objectForKey:@"id"] forKey:@"id"];
    if(self.isUpdated) {
        [changeset setObject:@"update" forKey:@"_operation"];
        [self.changedValues enumerateKeysAndObjectsUsingBlock:^(NSString *key, id obj, BOOL *stop) {
            NSString *jsonkey = [self JSONKeyForObjectKeyPath:key];
            if (jsonkey)
            {
                id jsonvalue = [jsondict objectForKey:jsonkey];
                if (jsonvalue){
                    [changeset setObject:jsonvalue forKey:jsonkey];
                }
            }
        }];
    }
    else if (self.isDeleted) {
        [changeset setObject:@"deleted" forKey:@"_operation"];
    }
    else {
        [changeset setObject:@"inserted" forKey:@"_operation"];
        [changeset addEntriesFromDictionary:jsondict];
    }
    
    return changeset;
}