ios - Mantle Objective C：将嵌套属性映射到 JSON

Question

我想用来Mantle序列化一些对象到这个JSON：

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

我有两个班级部门员工：

#import <Mantle/Mantle.h>

    @interface Department : MTLModel <MTLJSONSerializing>

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

    @end

和员工类：

#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

序列化 Employee 实例时，我收到以下异常：“NSInternalInconsistencyException”，“department.id 不是 Employee 的属性。”

这里有什么问题？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"
             };
}

serialize然后在您想要Employee对象时使用以下内容

Employee *objEmployee = [Employee instanceFromDict:responseObject]; 

我希望它对你有用。一切顺利！！

Answer 2

好的，我从这里得到它： Mantle property class based on another property?

我将映射字典修改为这样

+ (NSDictionary *)JSONKeyPathsByPropertyKey {

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

并补充说：

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

}