RestKit 0.20 NSArray序列化問題

Question

我想序列化一個對象的NSArray。

對象序列化爲：

{"age":1,"name":"Foo"} 

如果我有一個NSArray包含這些對象，它應該作爲序列：但是

[{"age":1,"name":"Bob"},{"age":4,"name":"Sally"},{"age":2,"name":"Jill"}] 

，當我通過RestKit直接序列化，我得到的以下：

{"age":[1,3,2],"name":["Sally","Jack","Bob"]} 

當我檢查RKMIMETypeSerialization，我看到了FO llowing：（這將匹配JSON輸出）

Parameters: { 
    age =  (
     1, 
     3, 
     2 
    ); 
    name =  (
     Sally, 
     Jack, 
     Bob 
    ); 
} 

我敢肯定，我只是在做一些非常愚蠢的，我一直在玩它不能弄明白。

這裏是我的映射邏輯

+ (RKObjectMapping *)mapping { 
    RKObjectMapping *mapping = [RKObjectMapping mappingForClass:[Item class]]; 
    [mapping addAttributeMappingsFromDictionary:@{ 
      @"name" : @"name", 
      @"age" : @"age" 
    }]; 

    return mapping; 
} 

這裏是做數組序列的邏輯：

+ (NSString *)JSONStringFromArray:(NSArray *)array { 
    RKObjectMapping *mapping = [Item mapping]; 
    RKRequestDescriptor *requestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:mapping.inverseMapping objectClass:[Item class] rootKeyPath:nil]; 
    NSError *error; 
    NSDictionary *parameters = [RKObjectParameterization parametersWithObject:array requestDescriptor:requestDescriptor error:&error]; 

// Serialize the object to JSON 
    NSData *JSON = [RKMIMETypeSerialization dataFromObject:parameters MIMEType:RKMIMETypeJSON error:&error]; 

    NSString *jsonString = [[NSString alloc] initWithBytes:[JSON bytes] 
                length:[JSON length] encoding:NSUTF8StringEncoding]; 
    return jsonString; 
} 

下面是測試類： Item.h

#import <Foundation/Foundation.h> 

@interface Item : NSObject 
@property(nonatomic, strong) NSString *name; 
@property(nonatomic) int age; 

+ (void)testJsonSerialization; 

+ (void)testJsonArraySerialization; 

+ (Item *)itemWithName:(NSString *)string age:(int)age; 
@end 

Item.m

#import "Item.h" 
#import <RestKit.h> 

@implementation Item 
+ (RKObjectMapping *)mapping { 
    RKObjectMapping *mapping = [RKObjectMapping mappingForClass:[Item class]]; 
    [mapping addAttributeMappingsFromDictionary:@{ 
      @"name" : @"name", 
      @"age" : @"age" 
    }]; 

    return mapping; 
} 

- (NSString *)JSONString { 
    RKObjectMapping *mapping = [Item mapping]; 
    RKRequestDescriptor *requestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:mapping.inverseMapping objectClass:[Item class] rootKeyPath:nil]; 
    NSError *error; 
    NSDictionary *parameters = [RKObjectParameterization parametersWithObject:self requestDescriptor:requestDescriptor error:&error]; 

// Serialize the object to JSON 
    NSData *JSON = [RKMIMETypeSerialization dataFromObject:parameters MIMEType:RKMIMETypeJSON error:&error]; 

    NSString *jsonString = [[NSString alloc] initWithBytes:[JSON bytes] 
                length:[JSON length] encoding:NSUTF8StringEncoding]; 
    return jsonString; 
} 

+ (NSString *)JSONStringFromArray:(NSArray *)array { 
    RKObjectMapping *mapping = [Item mapping]; 
    RKRequestDescriptor *requestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:mapping.inverseMapping objectClass:[Item class] rootKeyPath:nil]; 
    NSError *error; 
    NSDictionary *parameters = [RKObjectParameterization parametersWithObject:array requestDescriptor:requestDescriptor error:&error]; 

// Serialize the object to JSON 
    NSData *JSON = [RKMIMETypeSerialization dataFromObject:parameters MIMEType:RKMIMETypeJSON error:&error]; 

    NSString *jsonString = [[NSString alloc] initWithBytes:[JSON bytes] 
                length:[JSON length] encoding:NSUTF8StringEncoding]; 
    return jsonString; 
} 

+ (void)testJsonSerialization { 
    Item *item = [Item itemWithName:@"Foo" age:1]; 
    NSString *itemJSON = [item JSONString]; 
    NSLog(@"ItemJSON:\n%@\n\n", itemJSON); 
} 

+ (void)testJsonArraySerialization { 
    NSArray *items = @[[Item itemWithName:@"Sally" age:1], [Item itemWithName:@"Jack" age:3], [Item itemWithName:@"Bob" age:2]]; 
    NSString *itemJSON = [Item JSONStringFromArray:items]; 
    NSLog(@"ItemArrayJSON:\n%@\n\n", itemJSON); 
} 

+ (Item *)itemWithName:(NSString *)name age:(int)age { 
    Item *item = [[Item alloc] init]; 
    item.name = name; 
    item.age = age; 
    return item; 
} 
@end 

要執行 安裝有無RestKit吊艙，然後發出以下命令：

[Item testJsonSerialization]; 
    [Item testJsonArraySerialization]; 

注意，也許我沒有正確配置映射爲數組序列。儘管這個映射器完美地用於上面的反序列化目標json文本。

Answer 1

RKObjectParameterization預計將用於連續化對象映射的目標的各個實例，並將該實例靜態串行化爲一個NSMutableDictionary。你不能寫一個映射來與RKObjectParameterization一起使用，它會將一個對象數組序列化爲一個字典數組。您需要通過循環遍歷數組來完成此操作。