我想做的是:让用户对商店进行评分,然后更新Firebase中的storeRate
值。
单击POST后,出现错误:
'NSInvalidArgumentException',原因:“ JSON写入中的数字值无效(无限)”
//Initialize Variables
var storeRateIni = 0.0
var reviewCount = 0.0
var receivedId = 1 //receive storeId from parent View Controller
refStore = Database.database().reference().child("stores")
refUpdate = Database.database().reference().child("stores").child(String(receivedId))
refStore.observe(DataEventType.value, with: {(snapshot) in
if snapshot.childrenCount > 0{
for store in snapshot.children.allObjects as! [DataSnapshot]{
let storeObject = store.value as? [String: AnyObject]
let storeId = storeObject?["storeId"] as! Int
if (storeId == self.receivedId) {
//Get value store in Firebase
let storeRate = storeObject?["storeRate"] as! Double
let storeReviewCount = storeObject?["storeReviewsCount"] as! Double
//Do the calculation
let storeRateUpdate = (storeRate + self.userRate.rating) / storeReviewCount
//Update to Firebase
self.reviewCount = storeReviewCount + 1
self.storeRateIni = storeRateUpdate
self.refUpdate.updateChildValues(["storeRate": self.storeRateIni])
self.refUpdate.updateChildValues(["storeReviewsCount": self.reviewCount])
}}}})
答案 0 :(得分:0)
此行
let storeRateUpdate = (storeRate + self.userRate.rating) / storeReviewCount
在Double.inifinity
时生成storeReviewCount == 0.0
,这在JSON中无法表示。
您可能需要与其他案件分开处理案件storeReviewCount == 0.0
。
例如:
let storeRateUpdate = storeReviewCount == 0.0
? 0.0
: (storeRate + self.userRate.rating) / storeReviewCount