ios - 如何获取当前用户创建的所有 CloudKit 记录？

Question

假设我有一个“物种”记录类型，其中包含由许多用户创建的公共(public)记录。目前，我的查询检索“物种”的所有记录:

private func fetchSpecies() {
    // Fetch Public Database
    let publicDatabase = CKContainer.defaultContainer().publicCloudDatabase

    // Initialize Query
    let query = CKQuery(recordType: "Species", predicate: NSPredicate(format: "TRUEPREDICATE"))

    // Configure Query
    query.sortDescriptors = [NSSortDescriptor(key: "latinName", ascending: true)]

    // Perform Query
    publicDatabase.performQuery(query, inZoneWithID: nil) { (records, error) -> Void in
    dispatch_async(dispatch_get_main_queue(), { () -> Void in
        // Process Response on Main Thread
        self.processResponseForQuery(records, error: error)
        })
    }
}

我如何才能只获取当前用户(如设备所有者)创建的记录？

谢谢!

Answer 1

我还在 Apple 开发者论坛上发帖，我得到了一个 excellent solution :

To fetch only a specific user records, you need to create a CKReference pointing to that user id (recordID), then use a predicate on that. It looks like this:

First fetch the user record id

yourContainer.fetchUserRecordIDWithCompletionHandler { (userID, error) -> Void in  
    if let userID = userID {  
        // here's your userID (recordID) to play with  
    }  
}

Then construct the predicate:

let reference = CKReference(recordID: userID, action: .None)  
let predicate = NSPredicate(format: "creatorUserRecordID == %@", reference)  
let query = CKQuery(recordType: "Species", predicate: predicate) 

And then use the query as normal.

取货愉快!