i'm having trouble to convert a MAP into a LIST on DART.
Here is how my code looks like:
try {
var response = await http.get(url, headers: header);
List listaResponse = jsonDecode(response.body);
final lockers = <Locker>[];
for (Map map in listaResponse) {
Locker l = Locker.fromJson(map);
lockers.add(l);
}
return lockers;
} catch (e) {
print("error in api ");
print(e);
}
This is the output error:
I/flutter (14625): type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'List<dynamic>'
And this is how my json looks like:
{
meus_testes_vw: [
{
id_teste = 73,
otherinfo = ahsuasa
........
},
{
id_teste = 74,
........
}
]
}
Your JSON Data is not a List<Map<String, dynamic>> but a Map<String, List<Map<String, dynamic>>>: { 'meus_testes_vw': [...] }.
Try to change the assignment of your listaResponse:
List listaResponse = jsonDecode(response.body)['meus_testes_vw'];
Related
I would like to use a where clause in my Firestore query, with a list in parameter.
I used a for loop to do this but when I want to add all my values in a variable, I have some problems with the add function (variable type problem).
I understand the problem but I don't what is the way I have to take to do this in another way ...
Can anyone help me?
Best regards :) ###It's my first question on stack! :D ###
in my main class:
var games = [
"uno",
"poker",
];
return StreamProvider<List<AppUserData>>.value(
initialData: [],
value: DatabaseService().users4(games),
child: Scaffold(....
in my database class
List<AppUserData> _list = [];
void addToList(AppUserData value) {
_list.add(value);
}
Stream<List<AppUserData>> users4 (List games) {
print(games);
var b;
var len = games.length;
for (var i = 0; i < len + 1; i++) {
b = FirebaseFirestore.instance.collection("users")
.where("games", isEqualTo: games[i]).snapshots().map(
_userListFromSnapshot);
print("$b");
addToList(b);
}
return b;
}
List<AppUserData> _userListFromSnapshot(
QuerySnapshot<Map<String, dynamic>> snapshot) {
return snapshot.docs.map((doc) {
return _userFromSnapshot(doc);
}).toList();
}
AppUserData _userFromSnapshot(DocumentSnapshot<Map<String, dynamic>> snapshot) {
var data = snapshot.data();
if (data == null) throw Exception("user not found");
return AppUserData(
uid: uid,
name: snapshot.data()['name'],
distance: snapshot.data()['distance'],
games: snapshot.data()['games'],
id: snapshot.data()['id'],
);
}
I think you're looking for whereIn
Try this:
Stream<List<AppUserData>> users4(List games) async* {
yield* FirebaseFirestore.instance
.collection("users")
.where("games", whereIn: games)
.snapshots()
.map((e) {
List<AppUserData> l =
e.docs.map((e) => _userFromMap(Map.from(e.data()))).toList();
return l;
});
}
AppUserData _userFromMap(Map<String, dynamic> map) {
if (map == null) throw Exception("user not found");
return AppUserData(
uid: uid,
name: map['name'],
distance: map['distance'],
games: map['games'],
id: map['id'],
);
}
I want to convert the list coming from getPosts method (getting result from the web json and stored in the posts list) to List
Post Class
class Post {
final int userId;
final String id;
final String title;
final String body;
Post(this.userId, this.id, this.title, this.body);
}
Future<List<Post>> getPosts() async {
var data = await http
.get("https://jsonplaceholder.typicode.com/posts");
var jasonData = json.decode(data.body);
List<Post> posts = [];
for (var i in jasonData) {
Post post = Post(i["userId"], i["id"], i["title"], i["body"]);
posts.add(post);
}
return posts;
}
I tried to put the result directly to this method
static List<Map> convertToMap({List myList }) {
List<Map> steps = [];
myList.forEach((var value) {
Map step = value.toMap();
steps.add(step);
});
return steps;
}
but it's not working, I see this error
The argument type 'List<Map<dynamic, dynamic>>' can't be assigned to the parameter type 'Map<String, dynamic>'.
Change List<Map> by List<Map<String, dynamic>>
static List<Map<String, dynamic>> convertToMap({List myList }) {
List<Map<String, dynamic>> steps = [];
myList.forEach((var value) {
Map step = value.toMap();
steps.add(step);
});
return steps;
}
I have a futurebuilder that builds the UI based on a List, it does the job, however I get duplicates due to the UI being built again and again whenever I navigate. My question is, is there a innate method in Dart that can remove duplicates from a list? I've tried this StackOverflow question however it doesn't work.
Here is my custom model:
class HomeList {
Widget navigateScreen;
String imagePath;
PatientInfo patientInfo;
HomeList({
this.navigateScreen,
this.imagePath = '',
this.patientInfo,
});
static List<HomeList> homeList = [];
}
Here is my function for the futureBuilder i'm getting the data from my cloud_firestore:
_getPatients() async {
if (didLoadpatients == 0) {
print('this is didloadpatients at start of func $didLoadpatients');
var document = await db
.collection('users')
.document(mUser.uid)
.collection('patients');
document.getDocuments().then((QuerySnapshot query) async {
query.documents.forEach((f) {
uids.add(f.data['uID']);
});
didLoadpatients++;
print('this is didloadpatients at end of func $didLoadpatients');
for (var i = 0; i < uids.length; i++) {
var userDocuments = await db.collection('users').document(uids[i]);
userDocuments.get().then((DocumentSnapshot doc) {
print(doc.data);
homeList.add(HomeList(
imagePath: 'assets/fitness_app/fitness_app.png',
patientInfo: new PatientInfo.fromFbase(doc.data)));
});
print(homeList);
}
});
} else
print('I am leaving the get patient function');
}
Future<bool> getData() async {
_getCurrentUser();
await Future.delayed(const Duration(milliseconds: 1500), () async {
_getPatients();
});
return true;
}
Any help would be appreciated thank you!
To remove duplicates you can use Set Data Structure instead of List.
Just use Set instead of List to get unique values only.
Before Adding you can Remove Element from model this will Work
dummymodel.removeWhere((m) => m.id == id);
dummymodel.add(dummymodel.fromJson(data));
To Remove Duplicates from Data Model simply use Set (Data structure),
Original List with Duplicate Entries:
List<MyDataModel> mList = [MyDataModel(1), MyDataModel(2), MyDataModel(1), MyDataModel(3)];
New List that removes duplicate Entries from your List<MyDataModel>:
List<MyDataModel> mNewList = list.toSet().toList();
Output:
The result will be like
MyDataModel(1), MyDataModel(2), MyDataModel(3)
To remove the duplicate elements from custom object list, you need to override == and hashcode methods in your POJO class and then add the items in Set and again convert set to list to remove duplicate objects. Below is the working code:-
class TrackPointList {
double latitude;
double longitude;
String eventName;
Time timeZone;
TrackPointList({
this.latitude,
this.longitude,
this.eventName,
this.timeZone,
});
#override
bool operator==(other) {
// Dart ensures that operator== isn't called with null
// if(other == null) {
// return false;
// }
if(other is! TrackPointList) {
return false;
}
// ignore: test_types_in_equals
return eventName == (other as TrackPointList).eventName;
}
int _hashCode;
#override
int get hashCode {
if(_hashCode == null) {
_hashCode = eventName.hashCode;
}
return _hashCode;
}
factory TrackPointList.fromJson(Map<String, dynamic> json) => TrackPointList(
latitude: json["latitude"].toDouble(),
longitude: json["longitude"].toDouble(),
eventName: json["eventName"],
timeZone: timeValues.map[json["timeZone"]],
);
Map<String, dynamic> toJson() => {
"latitude": latitude,
"longitude": longitude,
"eventName": eventName,
"timeZone": timeValues.reverse[timeZone],
};
}
Above is the POJO class. Now below is the method which helps you to filter the objects according to the eventName data member.
List<TrackPointList> getFilteredList(List<TrackPointList> list){
final existing = Set<TrackPointList>();
final unique = list
.where((trackingPoint) => existing.add(trackingPoint))
.toList();
return unique;
}
This will work definitely.
Please +1 if it helps you.
I've come up with quite a brute force solution. Instead of
_getPatients() async {
if (didLoadpatients == 0) {
print('this is didloadpatients at start of func $didLoadpatients');
var document = await db
.collection('users')
.document(mUser.uid)
.collection('patients');
document.getDocuments().then((QuerySnapshot query) async {
query.documents.forEach((f) {
uids.add(f.data['uID']);
});
didLoadpatients++;
print('this is didloadpatients at end of func $didLoadpatients');
for (var i = 0; i < uids.length; i++) {
var userDocuments = await db.collection('users').document(uids[i]);
userDocuments.get().then((DocumentSnapshot doc) {
print(doc.data);
homeList.add(HomeList(
imagePath: 'assets/fitness_app/fitness_app.png',
patientInfo: new PatientInfo.fromFbase(doc.data)));
});
print(homeList);
}
});
} else
print('I am leaving the get patient function');
}
I've done what #Jay Mungara says and clear my Set everytime my UI rebuilds:
_getPatients() async {
homeList.clear();
if (didLoadpatients == 0) {
print('this is didloadpatients at start of func $didLoadpatients');
var document = await db
.collection('users')
.document(mUser.uid)
.collection('patients');
document.getDocuments().then((QuerySnapshot query) async {
query.documents.forEach((f) {
uids.add(f.data['uID']);
});
didLoadpatients++;
print('this is didloadpatients at end of func $didLoadpatients');
for (var i = 0; i < uids.length; i++) {
var userDocuments = await db.collection('users').document(uids[i]);
userDocuments.get().then((DocumentSnapshot doc) {
print(doc.data);
homeList.add(HomeList(
imagePath: 'assets/fitness_app/fitness_app.png',
patientInfo: new PatientInfo.fromFbase(doc.data)));
});
print(homeList);
}
});
} else
print('I am leaving the get patient function');
}
Thank you for all your answers!
this is a small examples to remove duplicate element
removeDuplicate() {
List<dynamic> demoList = [
{"userId": 1, "id": 1, "name": "thappu1"},
{"userId": 2, "id": 2, "name": "appu"},
{"userId": 1, "id": 1, "name": "thappu1"},
{"userId": 2, "id": 2, "name": "appu"},
{"userId": 2, "id": 2, "name": "appu"},
{"userId": 2, "id": 2, "name": "appu"},
{"userId": 2, "id": 2, "name": "appu"},
];
var toRemove = {};
demoList.forEach((e) {
toRemove.putIfAbsent("$e", () => e);
});
print(toRemove.keys.toList());
}
output is
[{userId: 1, id: 1, name: thappu1}, {userId: 2, id: 2, name: appu}]
I hope I manage to ask this properly:
I am using Alamofire and SwiftyJSON for managing the JSON files I get from the server.
I have issues with understanding the type of response.result.value , how to cast it to an object I can construct it with SwiftyJSON's JSON(data: data) constructor.
This is my code for the request using Alamofire:
func performRequest() {
// parameters["retry_count"] = retryNum
if let _ = host, let path = path {
let request = Alamofire.request(HOST + path, method: method, parameters: parameters, headers: headers)
request.responseJSON { response in
print("-----")
print(response.response?.statusCode)
print("-----")
// check if responseJSON already has an error
// e.g., no network connection
if let json = response.result.value {
print("--------")
print(json)
print("--------")
}
guard response.result.error == nil else {
print(response.result.error?.localizedDescription ?? "Response Error")
self.completionHandler?(response.result.isSuccess, nil)
self.retryRequest()
return
}
// make sure we got JSON and it's a dictionary
guard let json = response.result.value as? [String: AnyObject] else {
print("didn't get dictionary object as JSON from API")
self.completionHandler?(response.result.isSuccess, nil)
self.retryRequest()
return
}
// make sure status code is 200
guard response.response?.statusCode == 200 else {
// handle status code
self.completionHandler?(response.result.isSuccess, nil)
return
}
self.completionHandler?(response.result.isSuccess, json)
RequestsQueue.sharedInstance.sema.signal()
}
}
This results with this print:
{
numOfShiftsInDay = 3;
shifts = (
{
endTime = "14:00";
startTime = "07:30";
},
{
endTime = "20:00";
startTime = "13:30";
},
{
endTime = "02:00";
startTime = "19:30";
}
);
}
this data type is a [String: AnyObject].
I want to use it to construct a SwiftyJSON JSON object since it is easier for me to parse the data using SwiftyJSON methods..
This is the code I try for parsing it and then using it but obviously it doesn't work:
let json = JSON(data: data)
I get this compilation error:
Cannot convert value of type '[String : AnyObject]?' to expected argument type 'Data'
So how should I go about this?
You need to use JSON(data) instead of JSON(data: data) because this init(data:) wants Data as argument.
Changed line
let json = JSON(data: data)
To
let json = JSON(data)
I am getting xml output then i am converting that xml into json object.the format is given below.
{
"SOAP-ENV:Envelope": {
"#xmlns:SOAP-ENV": "http://schemas.xmlsoap.org/soap/envelope/",
"#xmlns:xsi": "http://www.w3.org/2001/XMLSchema-instance",
"#xmlns:xsd": "http://www.w3.org/2001/XMLSchema",
"SOAP-ENV:Body": {
"rpc:TestExampleResponse": {
"#xmlns:rpc": "http://Test.com/asi/",
"TestMessage": {
"listOfTESTS": {
"#xmlns:xmlns": "http://www.Test.com/xml/TEST",
"TESTS": [{
"id": "1",
"lastSyncDate": "12/16/2015 07:06:38",
"listOfTESTsyncrealtimeChild": null
}, {
"id": "2",
"lastSyncDate": "12/16/2015 07:06:38",
"listOfTESTsyncrealtimeChild": null
}
]
}
}
}
}
}
}
i want to extract Test array from JSON Output in Mulesoft.I dont know how to extract that array in mulesoft.Thanks in advance
You can use Dataweave (Transform Message component in Anypoint Studio)
(Mule EE)
Take a look to the documentation:
https://docs.mulesoft.com/mule-user-guide/v/3.7/using-dataweave-in-studio
Sample script for your input:
%dw 1.0
%input payload application/json
%output application/json
---
TESTS: payload."SOAP-ENV:Envelope"."SOAP-ENV:Body"."rpc:TestExampleResponse".TestMessage.listOfTESTS.TESTS map ((tEST , indexOfTEST) -> {
id: tEST.id,
lastSyncDate: tEST.lastSyncDate,
listOfTESTsyncrealtimeChild: tEST.listOfTESTsyncrealtimeChild
})
Output when using %output application/json:
{
"TESTS": [
{
"id": "1",
"lastSyncDate": "12/16/2015 07:06:38",
"listOfTESTsyncrealtimeChild": null
},
{
"id": "2",
"lastSyncDate": "12/16/2015 07:06:38",
"listOfTESTsyncrealtimeChild": null
}
]
}
Output when using %output application/java:
{TESTS=[{id=1, lastSyncDate=12/16/2015 07:06:38, listOfTESTsyncrealtimeChild=null}, {id=2, lastSyncDate=12/16/2015 07:06:38, listOfTESTsyncrealtimeChild=null}]}
You can write a custom transformer like below. This transformer uses Jackson (com.fasterxml.jackson) dependency.
The transformer returns a list of strings where each string represents an element of your TESTS array.
public class JsonArrayExtractor extends AbstractTransformer {
private final ObjectMapper mapper = new ObjectMapper();
private final String testsNodeJsonPointer = "/SOAP-ENV:Envelope/SOAP-ENV:Body/rpc:TestExampleResponse/TestMessage/listOfTESTS/TESTS";
public JsonArrayExtractor() {
registerSourceType(DataTypeFactory.STRING);
}
#Override
protected Object doTransform(Object src, String enc) throws TransformerException {
String payload = Objects.toString(src);
JsonNode root;
try {
root = mapper.readTree(payload);
} catch (IOException e) {
throw new TransformerException(this, e);
}
List<String> testsList = new ArrayList<>();
JsonNode testsNode = root.at(JsonPointer.valueOf(testsNodeJsonPointer));
if (testsNode instanceof ArrayNode) {
ArrayNode testsArrayNode = (ArrayNode) testsNode;
for (JsonNode test : testsArrayNode) {
testsList.add(test.toString());
}
}
return testsList;
}
}
And you can use the above transformer in your flow as below.
<custom-transformer class="org.ram.JsonArrayExtractor" doc:name="extractTestsArray"/>