Please help me understand the logic reading data from the Firestore document, if one of the values is an array. I tried other answers here and sources but never came to a simple working way and understand clearly. Firestore document structure — example. And Swift class targets for saving (conditional):
struct MyStruct {
var name: String
var pages: Int
}
let part1 = [MyStruct]()
let name1 = ""
let pages1 = 0
let part2 = [MyStruct]()
let name2 = ""
let pages2 = 0
func readFirestore() { }
What should the document reader function look like to add data to existing targets in the class? Thanks in advance for any help in improving my understanding!
They helped to deal with familiar, thank you for what they are. As expected, everything is simple. But for the beginner there is nothing more difficult than simplicity 😁
func readFirestore() {
self.db.collection("example").document("book").getDocument { (document, error) in
if error == nil {
if document != nil && document!.exists {
//get all document data
guard let documentData = document!.data() else {return}
//get value-array for key "part1"
let element = documentData["part1"] as? [Any] //print -> Optional([name1, 100])
//get first element in array
guard let nameDB = element?[0] as? String else {return} //print -> name1
guard let pagesDB = element?[1] as? String else {return} //print -> 100
//append in class
part1.append(MyStruct(name: nameDB, pages: pagesDB))
name1 = nameDB
pages1 = pagesDB
}
}
}
}
Related
I'm trying to filter my json data by IDs (trying mark some favourites and filter using it)
struct workoutList : Codable {
let id : Int
let title : String
let tag : String
}
func selectedWorkoutGroup(libraryFilter: Int, jsonErgWorkouts:[workoutList], workoutGroupBox: UITextField) -> [workoutList] {
var selectedGroup = [workoutList]()
let workoutFav = [1,10,100]
if libraryFilter == 0 {
// This works because I'm filtering based on 1 specific item
selectedGroup = jsonErgWorkouts.filter { $0.tag == workoutGroupBox.text }
} else if libraryFilter == 1 {
// Here I want to filter and show only the favorites
selectedGroup = jsonErgWorkouts.filter { $0.id } //
print("selectedGroup:\(selectedGroup)")
}
return selectedGroup
}
in the above code, the filter works when I have 1(one) something specific item to filter and then I get the entire json array with that tag.
Now I want to implement a favorite list, where the user selects for example ID == [1, 10 ,100] as their favourite.
How can I use the filter command to do it? I tried a few things and searched through SO (but doesn't work). Most of the answers are based on filtering based on specific items eg:
selectedGroup = jsonErgWorkouts.filter { workoutFav?.contains($0.id) }
edit: (omitted that I am using/storing the favourites in userDefaults. This code gives the error of "type of expression is ambiguous without more context"
func selectedWorkoutGroup(libraryFilter: Int, jsonErgWorkouts:[workoutList], workoutGroupBox: UITextField) -> [workoutList] {
var selectedGroup = [workoutList]()
UserDefaults.standard.set([1,10,100], forKey: "workoutFavorite")
/// This one gets stored as [Any] so I cast it to [Int]
let workoutFav = UserDefaults.standard.array(forKey: "workoutFavorite") as? [Int]
if libraryFilter == 0 {
// This works because I'm filtering based on 1 specific item
selectedGroup = jsonErgWorkouts.filter { $0.tag == workoutGroupBox.text }
} else if libraryFilter == 1 {
selectedGroup = workoutFav.flatMap { favouriteId in // for each favourite ID
jsonErgWorkouts.filter { $0.id == favouriteId } // This returns Error "type of expression is ambiguous without more context"
} // flatMap joins all those arrays returns by "filter" together, no need to do anything else
print("selectedGroup:\(selectedGroup)")
}
return selectedGroup
}
Final Solution:
Changing from This
let workoutFav = UserDefaults.standard.array(forKey: "workoutFavorite") as? [Int]
to This (notice the as! instead of as?)
let workoutFav = UserDefaults.standard.array(forKey: "workoutFavorite") as! [Int]
works using #sweeper's answer. Thanks
Update:
Figured out why this error occurred "type of expression is ambiguous without more context" when casting the output of UserDefaults as? [Int] and had to use as! [Int]
But using as! [Int] force unwrapping it causes app to crash if the user did not have any favorites saved into the UserDefault. (Which I then had to code around) like below
var workoutFav = [Int]()
if !(UserDefaults.standard.array(forKey: "workoutFavorite") == nil) {
workoutFav = UserDefaults.standard.array(forKey: "workoutFavorite") as! [Int]
}
Which was then simplified and removed the force unwrapping based on this SO https://stackoverflow.com/a/37357869/14414215 to become this one-line
let workoutFav = UserDefaults.standard.array(forKey: "workoutFavorite") as? [Int] ?? [Int]()
You need to do that filter for each id in the favourites array. You get an array of arrays as a result. To get the final array, you need to join those arrays to a single array. This "map each thing to an array and join the arrays" operation is what a flatMap does:
workoutFav.flatMap { favouriteId in // for each favourite ID
jsonErgWorkouts.filter { $0.id == favouriteId } // find workouts that match the ID
} // flatMap joins all those arrays returns by "filter" together, no need to do anything else
First thing first please give a struct name with a capital so you can distinguish between instance of it. Second you need to have new array where you will store each favorite, and store permanently that array, core data or some base on server, form there you will fetch favorites.
The better way is to add property like isFavorite: Bool that is false by default, and if user change it you can set it to be true, in that way you can avoid using ids for that and you can store whole workout's in one array to core data or base that you use, after that you can fetch from there with
let favorites = workouts.compactMap { $0.isFavorite == true }
Here you go in that way, but just to mention it highly recommended that you store those type of data outside User defaults.
struct Fav {
let name: String
let id: String
}
let df = UserDefaults.standard
let jk = ["aaa", "bbb", "cccc"]
df.setValue(jk, forKey: "favorites")
let fav1 = Fav(name: "zzz", id: "aaa")
let fav2 = Fav(name: "bbb", id: "qqq")
let favs = [fav1, fav2]
let favIDs = df.value(forKey: "favorites") as? [String]
favIDs?.forEach({ (id) in
let f = favs.filter({$0.id == id}) // here it is
})
I am consuming an API that gives me the next page in the Header inside a field called Link. (For example Github does the same, so it isn't weird.Github Doc)
The service that I am consuming retrieve me the pagination data in the following way:
As we can see in the "Link" gives me the next page,
With $0.response?.allHeaderFields["Link"]: I get </api/games?page=1&size=20>; rel="next",</api/games?page=25&size=20>; rel="last",</api/games?page=0&size=20>; rel="first".
I have found the following code to read the page, but it is very dirty... And I would like if anyone has dealt with the same problem or if there is a standard way of face with it. (I have also searched if alamofire supports any kind of feature for this but I haven't found it)
// MARK: - Pagination
private func getNextPageFromHeaders(response: NSHTTPURLResponse?) -> String? {
if let linkHeader = response?.allHeaderFields["Link"] as? String {
/* looks like:
<https://api.github.com/user/20267/gists?page=2>; rel="next", <https://api.github.com/user/20267/gists?page=6>; rel="last"
*/
// so split on "," the on ";"
let components = linkHeader.characters.split {$0 == ","}.map { String($0) }
// now we have 2 lines like '<https://api.github.com/user/20267/gists?page=2>; rel="next"'
// So let's get the URL out of there:
for item in components {
// see if it's "next"
let rangeOfNext = item.rangeOfString("rel=\"next\"", options: [])
if rangeOfNext != nil {
let rangeOfPaddedURL = item.rangeOfString("<(.*)>;", options: .RegularExpressionSearch)
if let range = rangeOfPaddedURL {
let nextURL = item.substringWithRange(range)
// strip off the < and >;
let startIndex = nextURL.startIndex.advancedBy(1) //advance as much as you like
let endIndex = nextURL.endIndex.advancedBy(-2)
let urlRange = startIndex..<endIndex
return nextURL.substringWithRange(urlRange)
}
}
}
}
return nil
}
I think that the forEach() could have a better solution, but here is what I got:
let linkHeader = "</api/games?page=1&size=20>; rel=\"next\",</api/games?page=25&size=20>; rel=\"last\",</api/games?page=0&size=20>; rel=\"first\""
let links = linkHeader.components(separatedBy: ",")
var dictionary: [String: String] = [:]
links.forEach({
let components = $0.components(separatedBy:"; ")
let cleanPath = components[0].trimmingCharacters(in: CharacterSet(charactersIn: "<>"))
dictionary[components[1]] = cleanPath
})
if let nextPagePath = dictionary["rel=\"next\""] {
print("nextPagePath: \(nextPagePath)")
}
//Bonus
if let lastPagePath = dictionary["rel=\"last\""] {
print("lastPagePath: \(lastPagePath)")
}
if let firstPagePath = dictionary["rel=\"first\""] {
print("firstPagePath: \(firstPagePath)")
}
Console output:
$> nextPagePath: /api/games?page=1&size=20
$> lastPagePath: /api/games?page=25&size=20
$> firstPagePath: /api/games?page=0&size=20
I used components(separatedBy:) instead of split() to avoid the String() conversion at the end.
I created a Dictionary for the values to hold and removed the < and > with a trim.
I want to store data into object form using swift language.The data structure of the data base is like
collection/
document/
collection/
document1/:
Invitess1(object) :
name :"santosh"
phone :1234567890
Invitee2(object) :
name :"sam"
phone:1234654768
.....
document 2/
Initee1(object) :
name:"red"
phone:4654343532
.......
is it possible to store data like this? if possible how to do it? i tried like this :
for var i in 0..<n { // n is no.of selected contacts
for var j in i...i {
print("amount is \(d[i])")
print("phone number is \(num[j])")
let dataToSave:[String: Any] = ["name" :"vijayasri",
"PhoneNumber":num[j],
"Amount": d[i],
]
}
}
var ref:DocumentReference? = nil
ref = self.db.collection("deyaPayUsers").document("nothing").collection("Split").addDocument(data: dataToSave){
error in
if let error = error {
print("error adding document:\(error.localizedDescription)")
} else {
print("Document ades with ID:\(ref!.documentID)" )
}
}
}
But it doesn't work. How to do it..
Your example code is never going to work as intended since dataToSave is overwritten every iteration of the j loop. Your inner j loop probably has a typo at i...i
To store multiple objects in one document, create the document in Swift with multiple objects in it. Since you know how to encode your object as [String:Any], just take those dictionaries combine into a larger [String:Any]document.
I would change your code to be more like:
var dataToSave: [String:Any] = []()
for var i in 0..<n { // n is no.of selected contacts
var inProcess: [String:Any] = []()
for var j in i...i {
print("amount is \(d[i])")
print("phone number is \(num[j])")
let detail: [String: Any] = ["name" :"vijayasri",
"PhoneNumber":num[j],
"Amount": d[i]]
inProcess["NextKey\(j)"] = detail
}
dataToSave["SomeKey\(i)"] = inProcess
}
var ref:DocumentReference? = nil
ref = self.db.collection("deyaPayUsers").document("nothing").collection("Split").addDocument(data: dataToSave){
error in
if let error = error {
print("error adding document:\(error.localizedDescription)")
} else {
print("Document ades with ID:\(ref!.documentID)" )
}
}
}
This is my JSON data, how can I get src data in 0 in pickArray?
"pickArray" : "{\"0\":{\"src\":\"https:\/\/fb-s-d-a.akamaihd.net\/h-ak-xpl1\/v\/t1.0-9\/p720x720\/18010403_1525007564199498_8009700960533638318_n.png?oh=25dbc9c1522dcfdd1d15cdd3e8c0c7da&oe=59997685&__gda__=1502470695_f212ade003e9b1c4ddc6a3ab6cc9e7e7\",\"width\":720,\"height\":720}}"
If I do it like this:
let dataArray = json["pickArray"]
print("dataArray = ",dataArray)
dataArray = {"0":{"src":"https://fb-s-d-a.akamaihd.net/h-ak-xpl1/v/t1.0-9/p720x720/18010403_1525007564199498_8009700960533638318_n.png?oh=25dbc9c1522dcfdd1d15cdd3e8c0c7da&oe=59997685&__gda__=1502470695_f212ade003e9b1c4ddc6a3ab6cc9e7e7","width":720,"height":720}}
But if I do it like this, show null:
let srcArray = dataArray["0"]
print("srcArray = ",srcArray)
I'm using swift3.0
Its looks like that with key pickArray you are having JSON response in String so get that string and convert it data and get JSON from it and then get src from it.
let stringResponse = json["pickArray"].stringValue
if let data = stringResponse.data(using: .utf8) {
let pickArray = JSON(data: data)
//Now access the pickArray to get the src
var sortedKeys = [String]()
if let allKeys = pickArray.dictionaryObject {
sortedKeys = Array(allKeys.keys).sorted { $0.compare($1, options: .numeric) == .orderedAscending }
}
for key in sortedKeys {
print(pickArray[key]["src"].stringValue)
print(pickArray[key]["width"].intValue)
print(pickArray[key]["height"].intValue)
}
}
let srcArray = dataArray["0"].dictionaryObject!
print("srcArray = \(srcArray)")
Now you can access element of "0" value as like below. Hope this work for you.
let jsonScr = JSON(srcArray)
let srcURL = jsonScr["scr"].stringValue
I asked a question yesterday that was marked as a duplicate, and when I updated the question it was not unmarked. So I am asking again here (as per stackoverflow's recommendation).
I am trying to sort by multiple values in firebase. I understand that is not possible, but i was given an example in another language which is only half helpful as how to go about doing it the right way. In any case i tried to follow the example given here Query based on multiple where clauses in firebase .
This is the structure of my firebase
room
-KJe22sduQMz1DIs_DH6
allowedParticipants:
14
createdBy:
"Mr Tester"
members:
"nmeMYnnSatRch5qKPJKIe7jEOLy2"
participating:
true
status:
"seedling"
theme:
"Cats"
totalNumberOfMembers:
1
and this is the code that I am trying to get to work
ref.queryOrderedByChild("status").queryStartingAtValue("active").queryEndingAtValue("active").observeEventType(.Value) { (snapshot: FIRDataSnapshot) in
let themeOfEvent = snapshot.value
if themeOfEvent?.value == pickedTheme {
print("foo")
}
}
Could somebody please post a useful comment or answer to help me?
Thank you
I was able to get help
This works
func listOfPossibleCompetitionsFromFirebase(){
let createdRoomRef = firebase.child("room")
createdRoomRef.queryOrderedByChild("status").queryStartingAtValue("active").queryEndingAtValue("active").observeEventType(.Value) { (snapshot: FIRDataSnapshot) in
var themeCount = 0
self.listOfOpenComps.removeAll()
if let tmp = snapshot.value as? [String:AnyObject] {
let keys = tmp.keys
for key in keys {
if let roomDetails = (tmp[key] as? [String:AnyObject]) {
if let themeOfEvent = roomDetails["theme"] as? String where themeOfEvent == pickedTheme {
themeCount += 1
self.listOfOpenComps.append(key)
}
}
}
}
dispatch_async(dispatch_get_main_queue(), {
self.tableView.reloadData()
})
print("rooms count: \(themeCount)")
}
}