ios - Realm.io 数组创建

Question

用其他 RLMObject 数组实例化 RLMObject 的正确方法是什么？

文档没有提及任何内容，我最初的尝试(什么都不做，假设 Realm 做了正确的事情并创建了一个空数组并在我建立第一个关系时分配它似乎不起作用。

这是我的代码:

[[RLMRealm defaultRealm] beginWriteTransaction];
[_realmAnswers removeAllObjects];
NSMutableArray* newArray = [NSMutableArray arrayWithCapacity:answers.count];

for (NSString* answerString in answers){
    OFEAnswerEntry* newAnswer = [[OFEAnswerEntry alloc] init];
    newAnswer.answerString = answerString;
    [newArray addObject:newAnswer];
}

[_realmAnswers addObjectsFromArray: newArray];
[[RLMRealm defaultRealm] commitWriteTransaction];

Answer 1

在 RLMArray 上使用 addObjectsFromArray: 方法:

ArrayPropertyObject *obj = [ArrayPropertyObject createInRealm:realm withObject:@[@"arrayObject", @[], @[]]];
StringObject *child1 = [StringObject createInRealm:realm withObject:@[@"a"]];
StringObject *child2 = [[StringObject alloc] init];
child2.stringCol = @"b";
[obj.array addObjectsFromArray:@[child2, child1]];

此代码直接取自 unit test在 realm-cocoa 中。

您还可以用更少的代码行来做到这一点:

NSArray *stringObjects = @[
    [[StringObject alloc] initWithObject:@[@"a"]],
    [[StringObject alloc] initWithObject:@[@"b"]]
];
[ArrayPropertyObject createInRealm:realm withObject:@[@"arrayObject", stringObjects, @[]]];