iOS - JSONModel的基本使用（OC）

1.MJExterntion用法之在模型中包含数组模型

需要重写类函数mj_objectClassInArray，说明对应的某个Array属性里是什么类对象。

//改变字典的key对应的属性名
+(NSDictionary *)mj_replacedKeyFromPropertyName{
    return @{@"fId":@"id"};
}

//说明数组中包含的模型是什么类，OaHandleModel是类，handleLogList是模型中的某个属性名。
+ (NSDictionary *)mj_objectClassInArray{
    return @{@"handleLogList":@"OaHandleModel"};
}

2.JSONModel基本使用

1.基于名称的自动映射

{
    "id": 123,
    "name": "Product name",
    "price": 12.95
}

@interface ProductModel : JSONModel
@property (nonatomic) NSInteger id;
@property (nonatomic) NSString *name;
@property (nonatomic) float price;
@end

2. 模型级联（模型包括其他模型）

{
    "orderId": 104,
    "totalPrice": 13.45,
    "product": {
        "id": 123,
        "name": "Product name",
        "price": 12.95
    }
}

@interface ProductModel : JSONModel
@property (nonatomic) NSInteger id;
@property (nonatomic) NSString *name;
@property (nonatomic) float price;
@end

@interface OrderModel : JSONModel
@property (nonatomic) NSInteger orderId;
@property (nonatomic) float totalPrice;
@property (nonatomic) ProductModel *product;
@end

3.模型集合

{
    "orderId": 104,
    "totalPrice": 103.45,
    "products": [
        {
            "id": 123,
            "name": "Product #1",
            "price": 12.95
        },
        {
            "id": 137,
            "name": "Product #2",
            "price": 82.95
        }
    ]
}

@protocol ProductModel;

@interface ProductModel : JSONModel
@property (nonatomic) NSInteger id;
@property (nonatomic) NSString *name;
@property (nonatomic) float price;
@end

@interface OrderModel : JSONModel
@property (nonatomic) NSInteger orderId;
@property (nonatomic) float totalPrice;
@property (nonatomic) NSArray <ProductModel> *products;
@end

或者

@interface OrderModel : JSONModel
@property (nonatomic) NSInteger orderId;
@property (nonatomic) float totalPrice;
@property (nonatomic) NSArray<ProductModel *> <ProductModel> *products;
@end

4.嵌套键映射

{
    "orderId": 104,
    "orderDetails": {
        "name": "Product #1",
        "price": {
            "usd": 12.95
        }
    }
}

@interface OrderModel : JSONModel
@property (nonatomic) NSInteger id;
@property (nonatomic) NSString *productName;
@property (nonatomic) float price;
@end

@implementation OrderModel

+ (JSONKeyMapper *)keyMapper
{
    return [[JSONKeyMapper alloc] initWithModelToJSONDictionary:@{
        @"id": @"orderId",
        @"productName": @"orderDetails.name",
        @"price": @"orderDetails.price.usd"
    }];
}

@end

5. 字段中带下划线

{
    "order_id": 104,
    "order_product": "Product #1",
    "order_price": 12.95
}

@interface OrderModel : JSONModel
@property (nonatomic) NSInteger orderId;
@property (nonatomic) NSString *orderProduct;
@property (nonatomic) float orderPrice;
@end

@implementation OrderModel

+ (JSONKeyMapper *)keyMapper
{
    return [JSONKeyMapper mapperForSnakeCase];
}

@end

6.可选属性（即可以缺失或为空）

{
    "id": 123,
    "name": null,
    "price": 12.95
}

@interface ProductModel : JSONModel
@property (nonatomic) NSInteger id;
@property (nonatomic) NSString <Optional> *name;
@property (nonatomic) float price;
@property (nonatomic) NSNumber <Optional> *uuid;
@end

7.忽略的属性（即JSONModel完全忽略它们）

{
    "id": 123,
    "name": null
}

@interface ProductModel : JSONModel
@property (nonatomic) NSInteger id;
@property (nonatomic) NSString <Ignore> *customProperty;
@end

8.标量类型可选

{
    "id": null
}

@interface ProductModel : JSONModel
@property (nonatomic) NSInteger id;
@end

@implementation ProductModel

+ (BOOL)propertyIsOptional:(NSString *)propertyName
{
    if ([propertyName isEqualToString:@"id"])
        return YES;

    return NO;
}

@end

9. 将模型导出为NSDictionary或JSON

ProductModel *pm = [ProductModel new];
pm.name = @"Some Name";

// convert to dictionary
NSDictionary *dict = [pm toDictionary];

// convert to json
NSString *string = [pm toJSONString];