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我使用Firebase数据库,我有一张卡片列表,如果它们被删除,我需要监视一些卡片。我试图用ref.observe (.childRemoved)
来做到这一点,但这不适合我的情况,因为持卡人可以删除一些数据,然后这个模块会触发多次,我需要观察整个卡是否被删除。我怎样才能做到这一点?如何观察从Firebase数据库中删除模型?
我参考
let ref = FIRDatabase.database().reference().child(MainGateways.cards.rawValue).child(card.id)
我的卡结构
"cards": {
"-Khv9rUVwErNHBzXcruO": {
"additionalInfo": {
"note": ""
},
"dateProperties": {
"day": "Flex",
"isFlexDate": true,
"isFlexTime": true,
"iso8601": "",
"time": ""
},
"interestedUsers": {
"NfM26A2YcPUFz8rfYa23Kr3mjCO2": {
"isApproved": false,
"isNew": true,
"isoDate": "2017-04-17T13:08:41+04:00",
"userID": "NfM26A2YcPUFz8rfYa23Kr3mjCO2",
"userItchableName": "Alexsander K."
}
},
"isNewPendingRequest": true,
"isPrivateStatus": false,
"isTest": false,
"ownerID": "1Cix149ThIOG1ULPVjyy0LyTxbe2",
"peopleProperties": {
"availableSeats": 1,
"numberOfPeople": 1,
"numberOfPeopleDescription": "1 person"
},
"title": "Genius Lounge and Sake Bar",
"userName": "Tim C.",
"version": 1
},
我也试图使这种联系,但随后如果有卡被从名单中剔除此块工作。
guard let ref = FIRDatabase.database().reference().child(MainGateways.cards.rawValue).child(card.id).parent else { return }