查询系统字段时出现 CKError: rejected "Unknown Field 'createdAt'"

Question

我正在这样排序 createdAt 系统字段：

query.sortDescriptors = [NSSortDescriptor(key: "createdAt", ascending: false)]

并得到以下错误：

CKError 0x1c4447fb0: "Invalid Arguments" (12/2018); server message = "Unknown field 'createdAt'"; uuid = 9C450848-2449-4892-93BC-C46363203042; container ID = "...

我能够查询和排序以这种方式创建的字段。系统字段有什么不同吗？该字段的索引是可排序和可查询的。

Answer 1

改为使用 creationDate 作为密钥。 CK 仪表板中的元键与用于查询的元键略有不同。这是元键列表：

recordID: CKRecordID
The unique ID of the record.

recordType: String
The app-defined string that identifies the type of the record.

creationDate: Date?
The time when the record was first saved to the server.

creatorUserRecordID: CKRecordID?
The ID of the user who created the record.

modificationDate: Date?
The time when the record was last saved to the server.

lastModifiedUserRecordID: CKRecordID?
The ID of the user who last modified the record.

recordChangeTag: String?
A string containing the server change token for the record.

查询系统字段时出现 CKError: rejected "Unknown Field 'createdAt'"

CKError when querying system field: rejected "Unknown Field 'createdAt'"

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