Realm Objective-C如何在写入数据库时​​忽略已经存在相同的主键？

Question

我从服务器获取数据列表。他们是各种各样的书籍。我有RLMObjects的书籍，书籍，人。

@class Person, Book;
@interface Person : RLMObject

@property (nonatomic, strong) NSString *name;
@property (nonatomic, assign) int age;
@property (nonatomic, assign) NSInteger id;
@end
RLM_ARRAY_TYPE(Person)


@interface Book : RLMObject

@property (nonatomic, strong) Person *author;
@property (nonatomic, strong) NSString *price;
@property (nonatomic, strong) RLMArray<Person> *translators;
@end
RLM_ARRAY_TYPE(Book)


@interface Books : RLMObject

@property (nonatomic, assign) NSInteger count;
@property (nonatomic, strong) NSString *year;
@property (nonatomic, strong) RLMArray<Book> *books;
@end

@implementation Person

+ (NSString *)primaryKey {
    return @"id";
}

@end

当我获得一系列书籍时，将它们从词典转到Books对象。然后将其添加到领域。

[[RLMRealm defaultRealm] transactionWithBlock:^{
        [[RLMRealm defaultRealm] addObject:[Books mj_objectWithKeyValues:responseObject]];
    } error:nil];

它崩溃了。因为那里有两本翻译相同的书。无法设置主键属性＆＃39; id＆＃39;现有价值＆＃39; 1314331＆＃39;。

那么，就像这种情况一样，如何将数据放入RLMRealm并保持每个人对象是唯一一个由primaryKey？

Answer 1

试试这个

[[RLMRealm defaultRealm] transactionWithBlock:^{
    RLMObject *object = [Books mj_objectWithKeyValues:responseObject];
    [[RLMRealm defaultRealm] addOrUpdateObject:object];
} error:nil];