ios - Swift 3 需要有关 Realm 查询的帮助

Question

我有两个模型类

class EntryModel: Object {
    dynamic var id: Int = 0
    dynamic var type: String = ""
    dynamic var tap: Int = 0
    dynamic var title: String = ""
    dynamic var notes: String = ""
    dynamic var startTime: Date? = nil
    dynamic var endTime: Date? = nil
    dynamic var amount1: Int = 0
    dynamic var amount2: Int = 0
    dynamic var meal: String = ""
    dynamic var foodDetails: String = ""
    dynamic var isAlarm: Bool = false
    dynamic var timeOfAlarm: Date? = nil
    //dynamic var lastFeedTime: Date? = nil // optionals supported

    override static func primaryKey() -> String? {
        return "id"
    }
}

和

class EntryModelList: Object {
    dynamic var id: Int = 0
    dynamic var babyId: Int = 0
    dynamic var date: Date? = nil
    var entryModel = List<EntryModel>()
    //dynamic var lastFeedTime: Date? = nil // optionals supported

    override static func primaryKey() -> String? {
        return "id"
    }
}

我是新手，所以不是很了解。我想要一个查询，它将通过使用 EntryModelList 的 babyId 和 EntryModel 的类型进行过滤来返回我。 which 将只匹配我想要的这个列表。

我试过

 let predicate = NSPredicate(format: "babyId == \(babyId) AND ANY entryModel.type IN %@", filterArray)
 let entryModelList = try! Realm().objects(EntryModelList.self).filter(predicate).sorted(byKeyPath: "date", ascending: false)

谓词输出:

babyId == 1 AND ANY entryModelList.type IN {"breast", "bottle"}

输出:

Results<EntryModelList> (
    [0] EntryModelList {
        id = 2;
        babyId = 1;
        date = 2017-02-16 18:00:00 +0000;
        entryModelList = RLMArray <0x6100000ff480> (
            [0] EntryModel {
                id = 8;
                type = diaper;
                tap = 1;
                title = ;
                notes = ;
                startTime = 2017-02-17 11:26:36 +0000;
                endTime = (null);
                amount1 = 0;
                amount2 = 0;
                meal = ;
                foodDetails = ;
                isAlarm = 0;
                timeOfAlarm = (null);
            },
            [1] EntryModel {
                id = 10;
                type = bottle;
                tap = 1;
                title = ;
                notes = Fgdg;
                startTime = 2017-02-16 23:44:22 +0000;
                endTime = (null);
                amount1 = 15;
                amount2 = 0;
                meal = ;
                foodDetails = ;
                isAlarm = 0;
                timeOfAlarm = (null);
            }
        );
    },
    [1] EntryModelList {
        id = 1;
        babyId = 1;
        date = 2017-02-14 18:00:00 +0000;
        entryModelList = RLMArray <0x6100000fd680> (
            [0] EntryModel {
                id = 1;
                type = breast;
                tap = 0;
                title = ;
                notes = ;'l'k,;
                startTime = 2017-02-14 23:15:49 +0000;
                endTime = (null);
                amount1 = 100;
                amount2 = 0;
                meal = ;
                foodDetails = ;
                isAlarm = 0;
                timeOfAlarm = (null);
            },
            [1] EntryModel {
                id = 4;
                type = bottle;
                tap = 0;
                title = ;
                notes = Jhkhjkhjk;
                startTime = 2017-02-15 01:17:47 +0000;
                endTime = (null);
                amount1 = 100;
                amount2 = 0;
                meal = ;
                foodDetails = ;
                isAlarm = 0;
                timeOfAlarm = (null);
            },
            [2] EntryModel {
                id = 7;
                type = breast;
                tap = 0;
                title = ;
                notes = ;
                startTime = 2017-02-15 11:43:08 +0000;
                endTime = (null);
                amount1 = 100;
                amount2 = 0;
                meal = ;
                foodDetails = ;
                isAlarm = 0;
                timeOfAlarm = (null);
            }
        );
    }
)

但这不是我想要的。我想知道如何只获取那些 EntryModel.type 是“breast”或“bottle”类型的数据列表。

谢谢。

Answer 1

Results.filter(_:) 只允许过滤结果集中包含给定类型的哪些对象。它不支持过滤哪些对象包含在这些对象的属性值中。

要完成您需要在您正在使用的对象的每个 entryModelList 属性上使用 filter(_:)仅包含您感兴趣的内容。