记奇特的调试bug

奇特的调试bug.png

传进来的model有值，并且可以打印model模型所有值；
但是打印model模型中的title、image、sort属性的时候，不是为nil，就是报错如下：
Execution was interrupted, reason: Attempted to dereference an invalid ObjC Object or send it an unrecognized selector. The process has been returned to the state before expression evaluation

原因排查：
打印的model为一个字典

{
    id = ad3886be78de49c8a6f66dfe9ba715fa,
    enable = 0,
    album = 1,
    delFlag = 1,
    ifBuy = 0,
    createDate = 1505893668000,
    vtime = ,
    type = 0,
    title = 微课堂,
    price = 1,
    image = 65617e87de1c4084ba1b78a673363b99,
    updateDate = 1508724726000,
    sort = 1
}

正确的打印出来如下：

(lldb) po model.yy_modelDescription
< videosModel: 0x600002a75700> {
    enable = "0";
    ifBuy = 0;
    image = "b31e4d4ac6fd472babe9bae7c768bc0d";
    price = 2;
    title = "政策解读1";
    type = "1";
    videoId = "4bb5310dcb9d4e7cb20aa00796da921f"
}

(lldb) po model
< videosModel: 0x600002a75700>

排查得出结果：网络请求回来的json类型数据没有转换为模型类型！！！

查看模型中的声明和实现如下

.h
@interface videosModel : NSObject

@property (nonatomic, copy) NSString *videoId;
@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) NSString *type;
@property (nonatomic, copy) NSString *enable;
@property (nonatomic, copy) NSString *image;
@property (nonatomic, assign) NSInteger ifBuy;
@property (nonatomic, strong) NSNumber *price;

@end


@interface videosListModel : NSObject

@property (nonatomic, strong)  NSArray < videosModel *> *videos;

@end


.m
@implementation videosModel
+ (nullable NSDictionary<NSString *, id> *)modelCustomPropertyMapper {
    return @{@"videoId":@"id"};
}
@end


@implementation videosListModel
@end

在.m文件中缺少了YYModel的类方法（自定义容器类属性映射模型类的方法）

+ (NSDictionary *)modelContainerPropertyGenericClass {
    return @{@"videos" : [videosModel class]};
}