swift3 - Firebase saving multiple child values to arrays -

looking @ structure of firebase database:

i attempting save values every key every cryptocurrency separate arrays.

for example, 'coinamount' key, array looking ["1.0,"2.0"], , 'coinname' ["bitcoin","ethereum"] etc each of 5 keys.

my attempt @ this:

let index = nsindexpath(item: 0, section: 0)     if portfoliocoinfullnamestring.count > 0 {         print("portfoliovc: number of coins in portfolio > 0")             let coinref = ref.child("\(portfoliocoinfullnamestring[index.row])")              coinref.observe(dataeventtype.value) { (snapshot) in                 child in snapshot.children {                     let snap = child as! datasnapshot                     let key = snap.key                     let value = snap.value                     print("key = \(key) ,, value = \(value!)")                     if key == "coinamount" {                         self.firebasecoinamountarray.append(double(value as! string)!)                     } else if key == "coinname" {                         self.firebasecoinnamearary.append(value as! string)                     } else if key == "coinprice" {                         self.firebasecoinpricearray.append(double(value as! string)!)                     } else if key == "coinsymbol" {                         self.firebasecoinsymbolarray.append(value as! string)                     } else if key == "cointotalfiat" {                         self.firebasecointotalfiatarray.append(double(value as! string)!)                     } else {                         print("portfoliovc: key not match anything!")                     }                 }             }     } else {         print("portfoliovc: number of coins in portfolio !> 0")     } 

this works adding first coin, when attempt add second 1 2 values appended array contains 3, , if add third coin append 3 values. not sure why looping through each coin?

edit: searched around stackoverflow , came across method:

let index = nsindexpath(item: 0, section: 0)     if portfoliocoinfullnamestring.count > 0 {         print("portfoliovc: number of coins in portfolio > 0")             let coinref = ref.child("\(portfoliocoinfullnamestring[index.row])")              coinref.observe(dataeventtype.value) { (snapshot) in                 let value = snapshot.value as? nsdictionary                 let coinname = value?["coinname"] as? string ?? ""                     self.firebasecoinnamearary.append(coinname)                 print("aaaaaa:\(self.firebasecoinnamearary)")             }     } else {         print("portfoliovc: number of coins in portfolio !> 0")     } 

but still have issue of when adding coin second element in array, array contains 3x first coin added instead of 2 entires of first coin , second coin. know if statement check if array contains name , if dont add it, how number values theres possibility coins have same price.??

edit2: been thinking it, work if observe values , not changes, save of arrays, populate cells them. if user edits 'coinamount' value in app, updates in firebase, not arrays. then, upon user closing app/logging out, next time portfolio shown re-pull values firebase contains updated numbers?

edit3: also, nodes under portfolio called 'bitcoin' etc, if called them coin1, coin2, coin3 etc, how path , key , values coin3? there way values nodes under 'protfolio' in 1 go?

the idea once save firebase data arrays populate tableview cell of data.

any appreciated :)

thanks,

jeremy

in order don't use for-loop use .childadded

i provide example

database.add entire path.child("portfolio").observe(dataeventtype.childadded) { (snapshot) in                   let key = snapshot.key                 let value = snapsnapshot.value as? nsdictionary                  //add in firebase                 let coinamount = value?["coinamount"] as? string                 let cointname = value?["coinname"] as? string                 //.... added variables database                   //use variables above , append array , work!              }         }