Mantle Objective C：将嵌套属性映射到 JSON

Question

我想使用 Mantle 将一些对象序列化到这个 JSON:

{
"name": "John Smith",
"age": 30,
"department_id":123
}

我有两个 classes 部门员工：

#import <Mantle/Mantle.h>

    @interface Department : MTLModel <MTLJSONSerializing>

    @property(nonatomic)int id;
    @property(nonatomic)NSString *name;

    @end

和员工 class：

#import <Mantle/Mantle.h>
#import "Department.h"

    @interface Employee : MTLModel <MTLJSONSerializing>

    @property(nonatomic)NSString *name;
    @property(nonatomic)int age;
    @property(nonatomic)Department *department;

    @end

@implementation Employee
+ (NSDictionary *)JSONKeyPathsByPropertyKey {

    return @{
             @"name":@"name",
             @"age":@"age",
             @"department.id":@"department_id"
             };
}
@end

when serializing an Employee instance I receive the following exception: "NSInternalInconsistencyException", "department.id is not a property of Employee."

这是怎么回事？有没有办法将对象序列化为单个字典，而不是将部门对象嵌套在员工对象中？

Answer 1

首先从您的 Employee.m 文件中删除此代码

@implementation Employee
+ (NSDictionary *)JSONKeyPathsByPropertyKey {

    return @{
             @"name":@"name",
             @"age":@"age",
             @"department.id":@"department_id"
             };
}

然后在你想要 serialize Employee 对象

时使用以下命令

Employee *objEmployee = [Employee instanceFromDict:responseObject];

希望对您有用。祝一切顺利！！

Answer 2

好的，我是从这里得到的： Mantle property class based on another property?

我把映射字典修改成这样

+ (NSDictionary *)JSONKeyPathsByPropertyKey {

    return @{
             @"name":@"name",
             @"age":@"age",
             NSStringFromSelector(@selector(department)) : @[@"department_id"]
             };
}

并添加：

    + (NSValueTransformer *)departmentJSONTransformer {
        return [MTLValueTransformer transformerUsingReversibleBlock:^id(Department *department, BOOL *success, NSError *__autoreleasing *error) {
           return [MTLJSONAdapter JSONDictionaryFromModel:department error:nil];
        }];

}

Mantle Objective C：将嵌套属性映射到 JSON

Mantle Objective C: mapping nested properties to JSON

json

objective-c

ios

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