根据 RLMArray 属性 的大小查询所有对象的领域?

Query Realm for all objects based on the size of a RLMArray property?

我们正在尝试编写一个 Realm 查询来检索 RLMArray 属性 大小为特定数字的所有对象。领域模型如下所示:

class Foo: RLMObject {
    dynamic var people = RLMArray(objectClassName: User.className())
}

我们已经尝试过但没有成功的查询的多次迭代如下:

// 'Invalid predicate expressions', reason: 'Predicate expressions must compare a keypath and another keypath or a constant value'
let results = Foo.objectsWhere("people[SIZE] = %d", 2)

// 'Invalid predicate', reason: 'RLMArray predicates must contain the ANY modifier'
let results = Foo.objectsWhere("people.@count = %d", 2)

// 'Invalid column name', reason: 'Column name @count not found in table'
let results = Foo.objectsWhere("ANY people.@count = %d", 2)

我们查看了多个示例、Apple 关于 NSPredicate 的文档和其他 SO 答案,但我们似乎无法找到答案。我们如何根据 RLMArray 的大小查询所有对象 属性?

那是 limitation of Realm until the release of version 0.96. Since then Keypath Collection Queries 受支持。