将自定义对象序列化为包含NSMutableArray的JSON

Question

我正在尝试序列化我的Cart对象，该对象中包含项的NSMutableArray ，但得到：

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Invalid type in JSON write (Item)'

如果我了解这应该如何工作，那么我需要创建一个字典数组以使NSJSONSerialization正确工作。 那不是我在下面做什么吗？

我的购物车：

@interface Cart : BaseObject

@property (nonatomic, strong) NSString *comp;
@property (nonatomic, strong) NSString *sono;
@property (nonatomic, strong) NSString *cust;
@property (nonatomic, strong) NSString *scus;
@property (nonatomic, strong) NSString *cnid;
@property (nonatomic, strong) NSString *dldt;
@property (nonatomic, strong) NSString *whse;
@property (nonatomic, strong) NSString *pono;
@property (nonatomic, strong) NSString *pon2;
@property (nonatomic, strong) NSString *emad;
@property (nonatomic, strong) NSString *pkin;
@property (nonatomic, strong) NSString *comt;
@property (nonatomic, strong) NSString *rtin;
@property (nonatomic, strong) NSString *lbfg;
@property (nonatomic, strong) NSString *containsOpenPriced;
@property (nonatomic, strong) NSString *totalProductAmount;
@property (nonatomic, strong) NSMutableArray *items;
@property (nonatomic) BOOL *isSubmitting;

@end

我的购物车：

@implementation Cart

@synthesize comp;
@synthesize sono;
@synthesize cust;
@synthesize scus;
@synthesize cnid;
@synthesize dldt;
@synthesize whse;
@synthesize pono;
@synthesize pon2;
@synthesize emad;
@synthesize pkin;
@synthesize comt;
@synthesize rtin;
@synthesize lbfg;
@synthesize containsOpenPriced;
@synthesize totalProductAmount;
@synthesize items;

- (id) initWithDictionary:(NSDictionary *)dictionary {
    self = [super init];
    if (self) {
        self.comp = dictionary[@"comp"];
        self.sono = dictionary[@"sono"];
        self.cust = dictionary[@"cust"];
        self.scus = dictionary[@"scus"];
        self.cnid = dictionary[@"cnid"];
        self.dldt = dictionary[@"dldt"];
        self.whse = dictionary[@"whse"];
        self.pono = dictionary[@"pono"];
        self.pon2 = dictionary[@"pon2"];
        self.emad = dictionary[@"emad"];
        self.pkin = dictionary[@"pkin"];
        self.comt = dictionary[@"comt"];
        self.rtin = dictionary[@"rtin"];
        self.lbfg = dictionary[@"lbfg"];
        self.containsOpenPriced = dictionary[@"containsOpenPriced"];
        self.totalProductAmount = dictionary[@"totalProductAmount"];

        NSArray *itemsArray = dictionary[@"items"];
        NSMutableArray *itemsMutableArray = [[NSMutableArray alloc]init];
        for (NSDictionary *itemDictionary in itemsArray) {
            Item *item = [[Item alloc] initWithDictionary:itemDictionary];
            [itemsMutableArray addObject:item];
        }
        self.items = itemsMutableArray;
    }

    return self;
}

@end

我的序列化对象的代码：

NSMutableArray *itemsToSerialize = [[NSMutableArray alloc] init];
for (Item *item in cart.items) {
    NSMutableDictionary *itemDict = [[NSMutableDictionary alloc] init];
    [itemDict setObject:item forKey:@"item"];
    [itemsToSerialize addObject:item];
}

NSMutableDictionary *data = [@{
        @"comp" : cart.comp,
        @"rtin" : cart.rtin,
        @"pono" : cart.pono,
        @"pon2" : cart.pon2,
        @"totalProductAmount" : totalProductAmount,
        @"sono" : cart.sono,
        @"emad" : cart.emad,
        @"lbfg" : lbfg,
        @"pkin" : cart.pkin,
        @"containsOpenPriced" : containsOpenPriced,
        @"cnid" : cart.cnid,
        @"whse" : cart.whse,
        @"scus" : cart.scus,
        @"dldt" : cart.dldt,
        @"cust" : cart.cust,
        @"comt" : cart.comt,
        @"items": itemsToSerialize
} mutableCopy];

NSString *command = @"shoppingCart.update";
NSMutableDictionary *request = [@{
        @"command" : command,
        @"comp" : cart.comp,
        @"cnid" : sessionController.operator.cnid,
        @"cust" : cart.cust,
        @"data" : data
} mutableCopy];

NSData *jsonData = [NSJSONSerialization dataWithJSONObject:request options:kNilOptions error:nil];

死于上述NSJSONSerialization行。 我想念什么？

Answer 1

这行： [itemsToSerialize addObject:item]; 应该是[itemsToSerialize addObject:itemDict]; 。 结果是您要尝试序列化项本身的数组，从而产生您所看到的异常。

Answer 2

NSJSONSerialization仅适用于数组（ NSArray或NSMutableArray ），字典（ NSDictionary或NSMutableDictionary ，字符串（ NSString或NSMutableString ）和NSNumber 。

常见的机制是在您的类上创建- (NSDictionary *)serialize方法，该方法将其所有值复制到字典中以传递到NSJSONSerialization中。 然后实现- (id)initFromSerialization:(NSDictionary *)serialization以反- (id)initFromSerialization:(NSDictionary *)serialization对象。

Answer 3

我知道这有点晚了，但也许该类可以简化您的编码：

它是将Custom NSObject转换为JSON可读对象（NSArray或NSDictionary）的类。 试试看。 它具有跳过属性和将属性类型从字符串更改为NSInteger或Float的功能，还可以更改最终输出属性名称，例如

CustomObject *X;
    X.property1 = @"Test";

//and the output JSON readable format you want tot change X to Y

//CustomObject converted to readable format
   {Y = @"Test"}

这是反汇编程序类