I have a dictionary that is being returned from a NSFetchRequest using the fetchRequest.resultType = .dictionaryResultType the dictionary returned is [Any] and looks like the folowing:
teams [{
team = Canadiens;
}, {
team = "Maple Leafs";
}, {
team = Penguins;
}]
I would like just an array of the values, like this [Canadiens, "Maple Leafs", Penguins"], how can I convert the array of dictionaries into an array only containing the values?
Full fetch
func teamNames(managedContext: NSManagedObjectContext) {
//print("\(self) -> \(#function)")
let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Players")
fetchRequest.fetchBatchSize = 8
fetchRequest.propertiesToGroupBy = [#keyPath(Players.team)]
fetchRequest.propertiesToFetch = [#keyPath(Players.team)]
fetchRequest.resultType = .dictionaryResultType
do {
let fetchTeamNamesDictionary = try managedContext.fetch(fetchRequest)
print("fetchTeamNamesDictionary \(fetchTeamNamesDictionary)")
} catch let error as NSError {
print("GoFetch|teamNames: Could not fetch. \(error), \(error.userInfo)")
}
}
Alternate to accepted answer:
do {
let fetchTeamNamesArray = try managedContext.fetch(fetchRequest)
for array in fetchTeamNamesArray {
let teamName = (array as AnyObject).value(forKey: "team") as! String
teamNameArray.append(teamName)
}
As you clearly know that the keys and values of the result are strings force-downcast the result to [[String:String]]
let teamArray = try managedContext.fetch(fetchRequest) as! [[String:String]]
Then map the dictionaries to its value for key team
let teamNames = teamArray.map { $0["team"]! }
Related
I have array of dictionary and the values are as follows:
[["-MXpvzmZdbqzrjND8w9F": {
lid = "-MW6eEidZFCLeeZ0uBk1";
message = hi;
timeStamp = 1617960107264;
title = "Sambhar Dosa";
user = 1QSU0c1q8QNrZzmICXGClC0o86E3;
}, "-MXq5NAyrkk4ZcvRFM7T": {
lid = "-MW6eEidZFCLeeZ0uBk1";
message = "how ru?";
timeStamp = 1617962828647;
title = "Sambhar Dosa";
user = 1QSU0c1q8QNrZzmICXGClC0o86E3;
}], ["-MXqa5-pkC28lY_Q_hpZ": {
lid = "-MWwEpHAhIdhN0i5sltB";
message = "hi nice cycle";
timeStamp = 1617971142820;
title = "Cycle for kids";
user = 1QSU0c1q8QNrZzmICXGClC0o86E3;
}]]
Here there are 2 elements in the array. I want to take the last element in both of the array and sort it based on the timestamp value.
How to do it? Please help me.
From comments, it seems that that the type of the array is:
typealias SomeDataArray = [[String: [String: Any]]]
So we're missing type safety from the beginning. The first thing I'd do is define a struct to represent Any in that definition. For now I'll just use a struct as a wrapper for the inner dictionary, using computed properties for all the fields:
struct SomeData
{
let dict: [String: Any]
var lid: String? { dict["lid"] as? String }
var message: String? { dict["message"] as? String }
var timeStamp: Int { dict["timeStamp"] as? Int ?? 0 }
var title: String? { dict["title"] as? String }
// Skipping user, because I have no idea what to make of its type.
}
Really this should be decoded into some real Swift type, but that's a topic for another day.
So now we redo the typealias
typealias SomeDataArray = [[String: SomeData]]
In chat it was explained what within the "last" element for each of these dictionaries can be defined as the one with the largest timeStamp value. Given that this will give this solution (retaining the keys)
let results = testData.map {
dict in dict.map {
($0.key, SomeData(dict: $0.value))
}.sorted { $0.1.timeStamp < $1.1.timeStamp }.last
}.filter { $0 != nil }.map { $0! }.sorted { $0.1.timeStamp < $1.1.timeStamp }
If you want to transform it back the [[String;Any]] you get from Firebase, then it would be this:
let results = testData.map {
dict in dict.map {
($0.key, SomeData(dict: $0.value))
}.sorted { $0.1.timeStamp < $1.1.timeStamp }.last
}.filter { $0 != nil }.map { $0! }.sorted { $0.1.timeStamp < $1.1.timeStamp }
.map { [$0.0: $0.1.dict as Any] }
My JSON data look like this image below. Now I wanna merge the value of Shop Type and Promotion into one to use as collection view data. How can I do that?
I just filter the response data from the server like this:
var dataBanDau: [SDFilterModel] = []
var quickData: [SDFilterModel] = []
let filters: [SDFilterModel] = data
self.filterEntries = filters
//let nsarray = NSArray(array: self.filterEntries! , copyItems: true)
// self.filterEntriesStoreConstant = nsarray as! Array
self.dataBanDau = filters
for i in 0..<self.dataBanDau.count {
if self.dataBanDau[i].search_key.count == 0 {
self.quickData.append(self.dataBanDau[i])
}
}
self.quickData = self.quickData.filter {
$0.type != "range"
}
DispatchQueue.main.async {
//Note: Reload TableView
self.quickFilterCollection.reloadData()
completed(true)
}
}
the class SDFilterModel:
class SDFilterModel: DSBaseModel {
var name = String()
var type = String()
var is_expanded = Int()
var search_key = String()
var filterEntries : [SDFilterModel]?
override func copy(with zone: NSZone? = nil) -> Any {
// This is the reason why `init(_ model: GameModel)`
// must be required, because `GameModel` is not `final`.
let copy = SDFilterModel(dict: self.dictionary)
if let arrAttribute = NSArray(array: self.value , copyItems: true) as? [AttributeValueModel] {
copy.value = arrAttribute
}
return copy
}
override init(dict: Dictionary<String, Any>) {
super.init(dict: dict);
value = self.valueParse()
name = dict.getString(forKey: "name")
type = dict.getString(forKey: "type")
search_key = dict.getString(forKey: "search_key")
is_expanded = dict.getInt(forKey: "is_expanded")!
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
var value: [AttributeValueModel] = [];
func valueParse()-> [AttributeValueModel] {
guard let childs = (self.dictionary["value"]) as? [Dictionary<String, AnyObject>]
else { return [] }
var output: [AttributeValueModel] = [];
for aDict in childs {
let item = AttributeValueModel(dict:aDict);
// if type == .Range && item.option_id == "0" {
// item.setRangeOptionID(aValue: item.option_name!)
// }
//
output.append(item);
}
return output;
}
Let be Assume you have let myArray = [1,2,3,4,5,6,7,8]
Now you wanted to square of each and every element in the array,
With for loop you do like this
for item in myArray {
print(item * item)
}
Now assume item = $0
With for map you jus do
myArray.map({ $0 * $0 })
Both will gave same output.
map : Use to do same operation on every element of array.
flatmap : It is used to flattern the array of array.
let myArr = [[1,2,3],[4,5,6,7]]
and you want o/p as [1,2,3,4,5,6,7]
So can get above output with myArr.flatMap({$0})
Now back to your question.
let reqArray = myModel.data.map({ $0.value }).flatMap({ $0 })
First, map gaves you array-of-array of key value but you need a single array, so for that you need to use flatmap.
You can take ref : https://medium.com/#Dougly/higher-order-functions-in-swift-sorted-map-filter-reduce-dff60b5b6adf
Create the models like this
struct Option {
let name: String
let searchKey: String
let id: String
}
struct Model {
let type: String
let name: String
let isExpanded: Bool
let value: [Option]
}
You should get the options array values and join all the arrays
let models:[Model] = //...
let collectionViewArray = models.map { $0.value }.reduce([Option](), +)
Using for loop
var collectionViewArray = [Option]()
for model in models {
collectionViewArray.append(contentsOf: model.value)
}
I currently have my set-up as followed:
I am running a query in Firebase to extract all of the genres within an array of genres, like so:
var genresLabelIndex : [String] = ["Horror", "Fiction", "Romance"]
Then I am creating a blank arrays for each of the genres to be able to store the information of the genres within each of the areas like so:
var horrorData = [InformationForFeed]()
var fictionData = [InformationForFeed]()
var romanceData = [InformationForFeed]()
InformationForFeed looks like so:
class InformationForFeed {
fileprivate var _uploadKey:String!
fileprivate var _userKey:String!
fileprivate var _imageURL:String!
fileprivate var _socialMedia:[String]
var uploadKey:String!{
return _uploadKey
}
var userKey:String!{
return _userKey
}
var imageURL:String!{
return _imageURL
}
init(dictionary:Dictionary<String,AnyObject>, socials: [String]) {
_socialMedia = socials
if let uploadKey = dictionary["upload_key"] as? String {
self._uploadKey = uploadKey
}
if let userKey = dictionary["user_key"] as? String {
self._userKey = userKey
}
if let imageURL = dictionary["imageUrl"] as? String {
self._imageURL = imageURL
}
}
}
I am then creating an Array of the list of genres arrays like so:
1) First I am creating an empty array of arrays like this:
var genreArrayIndex : [[InformationForFeed]] = []
2) Then within my init() of the UIView I am setting what will be in the array like this:
genreArrayIndex = [self.horrorData, self.fictionData, self.romanceData]
I then will run a function called getData() that will run my query and start storing the information.
I store my information of each genre in a tempArray, and then I set the genreArrayIndex[index] to equal the tempArray and then clear the tempArray as seen in getData below.
func getData() {
for genre in genresLabelIndex {
let dbReference = Database.database().reference().child("genres").child(genre)
let query = dbReference.queryLimited(toLast: 6)
query.observeSingleEvent(of: .value, with: { (snapshot : DataSnapshot) in
if snapshot.childrenCount > 0 {
for s in snapshot.children.allObjects as! [DataSnapshot] {
let item = s.value as! Dictionary<String,AnyObject?>
let facebook = (s.childSnapshot(forPath: "social_links").value as? NSDictionary)?["facebook_link"]
let audible = (s.childSnapshot(forPath: "social_links").value as? NSDictionary)?["audible_link"]
let amazon = (s.childSnapshot(forPath: "social_links").value as? NSDictionary)?["amazon_link"]
var socialsArray = [String]()
if facebook != nil {
socialsArray.append(facebook! as! String)
} else {
socialsArray.append("nil")
}
if audible != nil {
socialsArray.append(audible! as! String)
} else {
socialsArray.append("nil")
}
if amazon != nil {
socialsArray.append(amazon! as! String)
} else {
socialsArray.append("nil")
}
let data = InformationForFeed(dictionary: item as Dictionary<String,AnyObject>, socials: socialsArray)
self.newArray.append(data)
}
}
self.genreArrayIndex[self.genreArrayIndexCount] = self.newArray
self.genreArrayIndexCount = self.genreArrayIndexCount + 1
self.newArray.removeAll()
self.internalIndex = self.internalIndex + 1
if self.internalIndex == self.genresLabelIndex.count {
self.tableView.reloadData()
}
})
}
}
My tempArray looks like this:
var newArray = [InformationForFeed]()
The index looks like this:
var genreArrayIndexCount : Int = 0
Now comes the issue....
All of the information is properly being stored in the genreArrayIndex .....but... it is not actually storing the information in the arrays that being stored in genreArrayIndex.
So in other words if you were to print(self.genreArrayIndex) it would be fully populated. But if you were to print(self.fictionData) it would be blank.
How can I resolve this?
Array is a value type. That means its contents are copies. Initializing genreArrayIndex with empty horrorData, (and others) and then filling it with getData() does not also copy the data back into horrorData. I would recommend eliminating
genreArrayIndex = [self.horrorData, self.fictionData, self.romanceData]
and replacing horrorData, fictionData, ... with computed properties. Perhaps like this.
var horrorData: [InformationFeed] {
return genreArrayIndex[0]
}
I don't understand how to get array from dictionary, i have tried in this code but i want get array only content and type
This is my array
{
wsResponse = {
aarti =(
{
content = "";
identifier = "slok_one";
title = 1;
type = "\U092d\U0915\U094d\U0924\U093e\U092e\U0930";
},
{
content = "";
identifier = "slok_two";
title = 2;
type = "\U092d\U0915\U094d\U0924\U093e\U092e\U0930";
},
{
content = "";
identifier = "slok_three";
title = 3;
type = "\U092d\U0915\U094d\U0924\U093e\U092e\U0930";
}
}
);
};
Here is my code
Alamofire.request(url, method: .get, parameters: nil, encoding: JSONEncoding.default)
.responseJSON { response in
if let status = response.response?.statusCode {
switch(status){
case 201:
print("example success")
default:
print("error with response status: \(status)")
}
}
//to get JSON return value
if let array = response.result.value
{
let JSON = array as! NSDictionary
print("\(JSON)")
let response = JSON["wsResponse"] as! NSDictionary
let data = response["aarti"]
}
}
i want array from this ,like content,title,type
thank you in advance
According to the JSON this prints all values in the aarti array:
if let JSON = response.result.value as? [String:Any] {
if let response = JSON["wsResponse"] as? [String:Any],
let aarti = response["aarti"] as? [[String:Any]] {
for item in aarti {
let content = item["content"] as! String
let identifier = item["identifier"] as! String
let title = item["title"] as! Int
let type = item["type"] as! String
print(content, identifier, title, type)
}
}
}
Basically do not use NSDictionary / NSArray in Swift.
If you want to put all content values in an array use flatMap. The line can replace the whole repeat loop.
let contentArray = aarti.flatMap { $0["content"] as? String }
PS: If you are going to create multiple arrays from the values don't do that: Use a custom struct or class
if someone want to get dictionary of array and use it in tableview
declaration:
var list:[Any] = []
and initialisation :
self.list = (self.ListDic?["data"] as! NSArray!) as! [Any]
and use:
let dictObj = self.list[indexPath.row] as! NSDictionary
print("object value: ",dictObj["text"] as! String)
i need to save with NSUserDefaults an array that i get from jSON, the problem is it save only the first string and not all the array. So if the array is like NewYork,London,Rome .. it save only NewYork. I use it for a picker view.
This is the code:
EDIT
For save the Array from jSON:
if let jsonData = NSJSONSerialization.JSONObjectWithData(urlData!, options: nil, error: &error) as? [String:AnyObject] { // dictionary
if let locationsArray = jsonData["locations"] as? [[String:AnyObject]] { // array of dictionaries
for locationDictionary in locationsArray { // we loop in the array of dictionaries
if let location = locationDictionary["location_name"] as? String { // finally, access the dictionary like you were trying to do
// println(location)
var locationSave: Void = save.setObject(location, forKey: "Location")
}
}
}
}
}
and for request the Array:
var Location = save.objectForKey("Location")!
var pickerviewFields = Location
return pickerviewFields.count
Thanks in advance!
You can only save an NSArray, if the Array is a Swift Array, you will need to convert it. Also, NSArray and NSDictionary objects, their contents must be property list objects.
Here's how you would convert the Array:
var MyArray = ["a", "b", "c"]
var MyNSArray: NSArray
MyNSArray = MyArray as NSArray
println("\(MyNSArray)")
Prints: (a,b,c)
I have a small example with some sample JSON:
var myJSONString: NSString = "{ \"locations\" : [ { \"location_name\" : \"A\" }, { \"location_name\" : \"B\" }, { \"location_name\" : \"C\" }, { \"location_name\" : \"D\" } ] }"
var urlData: NSData? = NSData()
var error: NSError?
var save = NSUserDefaults.standardUserDefaults()
urlData = myJSONString.dataUsingEncoding(NSUTF8StringEncoding)
if let jsonData = NSJSONSerialization.JSONObjectWithData(urlData!, options: nil, error: &error) as? NSDictionary { // dictionary
if let locationsArray = jsonData["locations"] as? NSArray { // array of dictionaries
for locationDictionary in locationsArray { // we loop in the array of dictionaries
if let location = locationDictionary["location_name"] as? NSString {
println(location)
}
}
NSUserDefaults.standardUserDefaults().setObject(locationsArray, forKey: "locationArray")
}
}
println(save.dictionaryRepresentation())
You can try this:
Writing
let locationArray = ["London", "NewYork", "Rome"]
let locationData = NSKeyedArchiver.archivedDataWithRootObject(locationArray)
NSUserDefaults.standardUserDefaults().setObject(locationData, forKey: "Location")
NSUserDefaults.standardUserDefaults().synchronize()
Reading
let locationData = NSUserDefaults.standardUserDefaults().objectForKey("Location") as? NSData
if let locationData = locationData {
let locationArray = NSKeyedUnarchiver.unarchiveObjectWithData(locationData) as? [String]
if let locationArray = locationArray {
println(locationArray)
}
}