我想创建一个函数,它将返回给定字段值的documentID。我厌倦了我的嵌套函数。有一种简单的方法可以让一个函数返回ID吗?
这是我一直在做的事情。这是一个丑陋的模式。
public class func getAccountItems(accountName:String) {
let db = Firestore.firestore()
let defaults = UserDefaults.standard
let userId: String! = defaults.string(forKey: "UserUUID")
db.collection("Portfolios")
.whereField("users." + userId, isEqualTo: true)
.limit(to: 1)
.getDocuments() { (querySnapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
} else {
var documentID:String? = nil
for document in querySnapshot!.documents {
print("\(document.documentID) => \(document.data())")
documentID = document.documentID
if(documentID != nil){
do {
let db = Firestore.firestore()
let defaults = UserDefaults.standard
let portfolioId: String! = defaults.string(forKey: listDocKey)
db.collection("Portfolios").document(portfolioId).collection("Accounts").whereField("name", isEqualTo: accountName)
.getDocuments(){ (querySnapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
} else {
if querySnapshot!.documents.count == 1 {
for document in querySnapshot!.documents {
db.collection("Portfolios").document(documentID!).collection("Accounts").document(document.documentID).collection("Items")
.getDocuments() { (querySnapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
} else {
var items:[INDX01FirestoreService.PortfolioItem] = []
for document in querySnapshot!.documents {
print("\(accountName): \(document.documentID) => \(document.data())")
let pi = try! FirestoreDecoder().decode(INDX01FirestoreService.PortfolioItem.self, from: document.data())
items.append(pi )
}
NotificationCenter.default.post(name: NSNotification.Name(rawValue: "AccountItemsReceived"), object: nil, userInfo: ["items": items])
}
}
}
}else{
print ("Error count is \(querySnapshot!.documents.count)")
}
}
}
}
}
}
}
}
}
由于Firestore是异步调用,我这样做或者发送通知。我不喜欢在整个地方发送通知。