[RKObjectMapping addPropertyMapping：]在ios中崩溃
刚刚开始使用RestKit几天，需要您的审查，我错了..在ios应用程序崩溃：***声明失败 - [RKObjectMapping addPropertyMapping：]
@interface VGShowCheckIn：NSObject
@property（nonatomic，strong）NSNumber * ad_units;
@property（nonatomic，strong）VGShowDetails *程序;
@interface VGShowDetails：NSObject
@属性（复制，非原子）NSString * programTitle;
@属性（复制，非原子）NSString * showId;
=======
RKObjectMapping * checkinMapping = [RKObjectMapping mappingForClass：[VGShowCheckIn class]];
[checkinMapping addAttributeMappingsFromDictionary:@{
@"ad_units" : @"ad_units",
@"program" : @"program"
}];
RKObjectMapping *showMapping = [RKObjectMapping mappingForClass:[VGShowDetails class]];
[showMapping addAttributeMappingsFromDictionary:@{
@"id" : @"showId",
@"title" : @"programTitle",
}];
和应用程序崩溃在这里：[checkinMapping addPropertyMapping：[RKRelationshipMapping relationshipMappingFromKeyPath：@“program”toKeyPath：@“program”withMapping：showMapping]];
其余的api回应是：
{
data = {
"ad_units" = 3;
program = {
id = SH017232340000;
title = "Man v. Food Nation";
}
}
}
可以任何人指导我什么是错的行：[checkinMapping addPropertyMapping：[RKRelationshipMapping relationshipMappingFromKeyPath：@“program”toKeyPath：@“program”withMapping：showMapping]];
崩溃问题：***声明失败 - [RKObjectMapping addPropertyMapping：]
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