RestKit RKObjectMapping错误,从0.10更新到0.20

我正在将RestKit从0.10更新到0.20,并得到一些我正在尝试解决的错误。

我在Spring.m文件中发现错误 MappingForClass:usingBlock ,没有@接口 mapKeyPathsToAttributes ,并且没有@接口 hasMany:withMapping .

我自己似乎想不出来。

弹簧.h

@interface Spring : NSObject

@property (nonatomic, strong) NSString *name;
@property (nonatomic, strong) NSNumber *id;
@property (nonatomic, strong) NSArray *leafs;

+ (RKObjectMapping *)mapping;

@end

弹簧.m

@implementation Spring

// Creating RestKit object mapping variable, THIS IS WHERE ERRORS OCCUR
+ (RKObjectMapping *)mapping {
    RKObjectMapping *objectMapping = [RKObjectMapping mappingForClass:[self class] usingBlock:^(RKObjectMapping *mapping) {
       [mapping mapKeyPathsToAttributes:
            @"name", @"name",
            @"id", @"id",
            nil];
        [mapping hasMany:@"leafs" withMapping:[Leaf mapping]];
    }];

    return objectMapping;
}

@end

我正在使用 https://github.com/RestKit/RestKit/wiki/Upgrading-from-v0.10.x-to-v0.20.0 帮我想办法解决这个问题。