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I want this code to convert a csv file to a list, and then convert it to json, for the firebase database, instead of list this code return array it shows an instance of class, like this :
[Instance of 'User', Instance of 'User', Instance of 'User']
void main() {
var users= "username, email, phone \n ctavia,octavia#gmail.com, 099-83-44 \n lark, clark#gmail.com, 054-83-23 \n aven, raven#gmail.com, 784-44-98";
var data = csvToUsersList(users);
print(data);
}
class User {
String username;
String email;
String phone;
User(this.username, this.email, this.phone);
}
List<User> csvToUsersList(String data) {
List<User> users = [];
List<String> userin= data.split("\n");
for (int i = 1; i < userin.length; i++) {
List<String> user = userin[i].split(",");
users.add(User(user[0], user[1], user[2]));
}
return users;
}
That seems correct. If you print something like data.first.username, you should get the name of the first User.
Instance of User just means, that this is an Object of Type User.
I have difficulty to convert a long list to JSON string. This is my main model which I want to convert to JSON string
class ActivityBookingRequest {
int adminId;
List<ActivityBookingDetail> activityBookingList;
Map toJson() {
List<Map> activityBookingListMap = this.activityBookingList != null
? this.activityBookingList.map((i) => i.toJson()).toList()
: null;
return {
'adminId': adminId,
'activityBookList': activityBookingListMap,
};
}
}
This is my sub-model which is the list I am trying to serialize!
class ActivityBookingDetail {
int bookingId;
int resourceId;
int sourceId;
String sourceName;
int productId;
String pickupDate;
String cutOffDate;
int adultNumber;
int childrenNumber;
ActivityBookingDetail(
this.bookingId,
this.resourceId,
this.sourceId,
this.sourceName,
this.productId,
this.pickupDate,
this.cutOffDate,
this.adultNumber,
this.childrenNumber,
);
Map<String, dynamic> toJson() {
return {
'ssId': bookingId,
'ssResourceId': resourceId,
'sourceId': sourceId,
'sourceName': sourceName,
'productId': productId,
'pickupDate': pickupDate,
'cutOffDate': cutOffDate,
'noAdult': adultNumber,
'noChild': childrenNumber,
};
}
}
When I convert this to a JSON string if the list is long, the final JSON string is getting cut off!
{"adminId":213,{"ssId":4,"ssResourceId":4,"sourceId":1,"sourceName":"TRES","productId":3,"pickupDate":"2022-09-08T18:30:00","cutOffDate":"2022-09-08T18:30:00","noAdult":1,"noChi
I need to use the Unsplash API to display a list of pictures that come to me, the title and the author. The problem is that I do not understand how to create a model for converting JSON that comes to me so that I can get the picture, author and title. JSON has nested elements and I don't understand how to do it. How can i do this?
My JSON for one picture:
{
"id":"RBo6ayiFND0",
"created_at":"2022-07-08T13:04:40-04:00",
"updated_at":"2022-07-22T00:20:05-04:00",
"promoted_at":null,
"width":4160,
"height":6240,
"color":"#c0c0c0",
"blur_hash":"LPIOLgtR%1IT~qsSMxxZx]V#s.RP",
"description":null,
"alt_description":null,
"urls":{
"raw":"https://images.unsplash.com/photo-1657299156528-2d50a9a6a444?ixid=MnwzNDg3MDF8MXwxfGFsbHwxfHx8fHx8Mnx8MTY1ODQ4ODUyOQ\u0026ixlib=rb-1.2.1",
"full":"https://images.unsplash.com/photo-1657299156528-2d50a9a6a444?crop=entropy\u0026cs=tinysrgb\u0026fm=jpg\u0026ixid=MnwzNDg3MDF8MXwxfGFsbHwxfHx8fHx8Mnx8MTY1ODQ4ODUyOQ\u0026ixlib=rb-1.2.1\u0026q=80",
"regular":"https://images.unsplash.com/photo-1657299156528-2d50a9a6a444?crop=entropy\u0026cs=tinysrgb\u0026fit=max\u0026fm=jpg\u0026ixid=MnwzNDg3MDF8MXwxfGFsbHwxfHx8fHx8Mnx8MTY1ODQ4ODUyOQ\u0026ixlib=rb-1.2.1\u0026q=80\u0026w=1080",
"small":"https://images.unsplash.com/photo-1657299156528-2d50a9a6a444?crop=entropy\u0026cs=tinysrgb\u0026fit=max\u0026fm=jpg\u0026ixid=MnwzNDg3MDF8MXwxfGFsbHwxfHx8fHx8Mnx8MTY1ODQ4ODUyOQ\u0026ixlib=rb-1.2.1\u0026q=80\u0026w=400",
"thumb":"https://images.unsplash.com/photo-1657299156528-2d50a9a6a444?crop=entropy\u0026cs=tinysrgb\u0026fit=max\u0026fm=jpg\u0026ixid=MnwzNDg3MDF8MXwxfGFsbHwxfHx8fHx8Mnx8MTY1ODQ4ODUyOQ\u0026ixlib=rb-1.2.1\u0026q=80\u0026w=200",
"small_s3":"https://s3.us-west-2.amazonaws.com/images.unsplash.com/small/photo-1657299156528-2d50a9a6a444"
},
"links":{
"self":"https://api.unsplash.com/photos/RBo6ayiFND0",
"html":"https://unsplash.com/photos/RBo6ayiFND0",
"download":"https://unsplash.com/photos/RBo6ayiFND0/download?ixid=MnwzNDg3MDF8MXwxfGFsbHwxfHx8fHx8Mnx8MTY1ODQ4ODUyOQ",
"download_location":"https://api.unsplash.com/photos/RBo6ayiFND0/download?ixid=MnwzNDg3MDF8MXwxfGFsbHwxfHx8fHx8Mnx8MTY1ODQ4ODUyOQ"
},
"categories":[
],
"likes":21,
"liked_by_user":false,
"current_user_collections":[
],
"sponsorship":{
"impression_urls":[
"https://secure.insightexpressai.com/adServer/adServerESI.aspx?script=false\u0026bannerID=10624831\u0026rnd=[timestamp]\u0026redir=https://secure.insightexpressai.com/adserver/1pixel.gif"
],
"tagline":"Wholesome crispbread from Sweden",
"tagline_url":"https://www.wasa.com/global/",
"sponsor":{
"id":"5tdWPtk6hBg",
"updated_at":"2022-07-22T06:53:49-04:00",
"username":"wasacrispbread",
"name":"Wasa Crispbread",
"first_name":"Wasa Crispbread",
"last_name":null,
"twitter_username":null,
"portfolio_url":"https://www.wasa.com/global/",
"bio":"Things we love:\r\nš Crispbread (naturally) š Our planet š Delicious food, everyday",
"location":null,
"links":{
"self":"https://api.unsplash.com/users/wasacrispbread",
"html":"https://unsplash.com/#wasacrispbread",
"photos":"https://api.unsplash.com/users/wasacrispbread/photos",
"likes":"https://api.unsplash.com/users/wasacrispbread/likes",
"portfolio":"https://api.unsplash.com/users/wasacrispbread/portfolio",
"following":"https://api.unsplash.com/users/wasacrispbread/following",
"followers":"https://api.unsplash.com/users/wasacrispbread/followers"
},
"profile_image":{
"small":"https://images.unsplash.com/profile-1655151625963-f0eec015f2a4image?ixlib=rb-1.2.1\u0026crop=faces\u0026fit=crop\u0026w=32\u0026h=32",
"medium":"https://images.unsplash.com/profile-1655151625963-f0eec015f2a4image?ixlib=rb-1.2.1\u0026crop=faces\u0026fit=crop\u0026w=64\u0026h=64",
"large":"https://images.unsplash.com/profile-1655151625963-f0eec015f2a4image?ixlib=rb-1.2.1\u0026crop=faces\u0026fit=crop\u0026w=128\u0026h=128"
},
"instagram_username":"wasacrispbread",
"total_collections":0,
"total_likes":0,
"total_photos":73,
"accepted_tos":true,
"for_hire":false,
"social":{
"instagram_username":"wasacrispbread",
"portfolio_url":"https://www.wasa.com/global/",
"twitter_username":null,
"paypal_email":null
}
}
},
"topic_submissions":{
},
"user":{
"id":"5tdWPtk6hBg",
"updated_at":"2022-07-22T06:53:49-04:00",
"username":"wasacrispbread",
"name":"Wasa Crispbread",
"first_name":"Wasa Crispbread",
"last_name":null,
"twitter_username":null,
"portfolio_url":"https://www.wasa.com/global/",
"bio":"Things we love:\r\nš Crispbread (naturally) š Our planet š Delicious food, everyday",
"location":null,
"links":{
"self":"https://api.unsplash.com/users/wasacrispbread",
"html":"https://unsplash.com/#wasacrispbread",
"photos":"https://api.unsplash.com/users/wasacrispbread/photos",
"likes":"https://api.unsplash.com/users/wasacrispbread/likes",
"portfolio":"https://api.unsplash.com/users/wasacrispbread/portfolio",
"following":"https://api.unsplash.com/users/wasacrispbread/following",
"followers":"https://api.unsplash.com/users/wasacrispbread/followers"
},
"profile_image":{
"small":"https://images.unsplash.com/profile-1655151625963-f0eec015f2a4image?ixlib=rb-1.2.1\u0026crop=faces\u0026fit=crop\u0026w=32\u0026h=32",
"medium":"https://images.unsplash.com/profile-1655151625963-f0eec015f2a4image?ixlib=rb-1.2.1\u0026crop=faces\u0026fit=crop\u0026w=64\u0026h=64",
"large":"https://images.unsplash.com/profile-1655151625963-f0eec015f2a4image?ixlib=rb-1.2.1\u0026crop=faces\u0026fit=crop\u0026w=128\u0026h=128"
},
"instagram_username":"wasacrispbread",
"total_collections":0,
"total_likes":0,
"total_photos":73,
"accepted_tos":true,
"for_hire":false,
"social":{
"instagram_username":"wasacrispbread",
"portfolio_url":"https://www.wasa.com/global/",
"twitter_username":null,
"paypal_email":null
}
}
},
Picture Model:
class PictureModel {
const PictureModel({});
factory PictureModel.fromJson(Map < String, dynamic > json) {
return PictureModel(
...
);
}
}
If I understand correctly you only need:
image
title (I'll assume this is description)
author (I'll assume this is user.name)
You can create the PictureModel as follows:
class PictureModel {
final String author;
final String? title;
final String imageUrl;
const PictureModel({
required this.author,
this.title,
required this.imageUrl,
});
factory PictureModel.fromJson(Map<String, dynamic> json) {
return PictureModel(
author: json['user']['name'],
title: json['description'],
imageUrl: json['urls']['regular'],
);
}
}
Guessing you meant something like below by saying nested.
To simplify it, let's use Photo and Urls properties
class Photo {
Photo({
this.id,
this.urls,
...
});
String? id;
Urls? urls;
...
factory Photo.fromJson(Map<String, dynamic> json) {
return Photo(
id: json['id'],
urls: Urls.fromJson(json['urls']),
...
);
}
}
Then Urls object.
class Urls {
Urls({
this.rawUrl,
this.fullUrl,
this.regularUrl,
this.smallUrl,
this.thumbUrl,
this.smallS3Url,
});
String? rawUrl;
String? fullUrl;
String? regularUrl;
String? smallUrl;
String? thumbUrl;
String? smallS3Url;
factory Urls.fromJson(Map<String, dynamic> json) => Urls(
rawUrl: json['raw'],
fullUrl: json['full'],
regularUrl: json['regular'],
smallUrl: json['small'],
thumbUrl: json['thumb'],
smallS3Url: json['small_s3'],
);
Map<String, dynamic> toJson() => {
'rawUrl': rawUrl,
'fullUrl': fullUrl,
'regularUrl': regularUrl,
'smallUrl': smallUrl,
'thumbUrl': thumbUrl,
'smallS3Url': smallS3Url,
};
}
Simply you can use any JSON to Dart tool, that takes the JSON and returns a dart model like this one.
Or you can do it manually by making nested classes.
firstly you will make a parent class that contains the first level of the JSON file and each element containing other elements inside will be a separate class and you will use it as a type of the element.
so if we took the first level of the file and one other element from the second level such as the element user your code will be something like this:
class Pic {
Pic.fromJson(dynamic json) {
id = json['id'];
createdAt = json['created_at'];
updatedAt = json['updated_at'];
promotedAt = json['promoted_at'];
width = json['width'];
height = json['height'];
color = json['color'];
blurHash = json['blur_hash'];
description = json['description'];
altDescription = json['alt_description'];
urls = Urls.fromJson(json['urls']);
links = Links.fromJson(json['links']);
if (json['categories'] != null) {
categories = [];
json['categories'].forEach((v) {
categories?.add(Categories.fromJson(v));
});
}
likes = json['likes'];
likedByUser = json['liked_by_user'];
if (json['current_user_collections'] != null) {
currentUserCollections = [];
json['current_user_collections'].forEach((v) {
currentUserCollections?.add(CurrentUserCollections.fromJson(v));
});
}
sponsorship = json['sponsorship'] != null ? Sponsorship.fromJson(json['sponsorship']) : null;
topicSubmissions = json['topic_submissions'];
user = User.fromJson(json['user']);
}
String? id;
String? createdAt;
String? updatedAt;
dynamic promotedAt;
int? width;
int? height;
String? color;
String? blurHash;
dynamic description;
dynamic altDescription;
Urls? urls;
Links? links;
List<dynamic>? categories;
int? likes;
bool? likedByUser;
List<dynamic>? currentUserCollections;
Sponsorship? sponsorship;
dynamic topicSubmissions;
User? user;
}
class User {
User.fromJson(dynamic json) {
id = json['id'];
updatedAt = json['updated_at'];
username = json['username'];
name = json['name'];
firstName = json['first_name'];
lastName = json['last_name'];
twitterUsername = json['twitter_username'];
portfolioUrl = json['portfolio_url'];
bio = json['bio'];
location = json['location'];
links = json['links'] != null ? Links.fromJson(json['links']) : null;
profileImage = json['profile_image'] != null ? ProfileImage.fromJson(json['profile_image']) : null;
instagramUsername = json['instagram_username'];
totalCollections = json['total_collections'];
totalLikes = json['total_likes'];
totalPhotos = json['total_photos'];
acceptedTos = json['accepted_tos'];
forHire = json['for_hire'];
social = json['social'] != null ? Social.fromJson(json['social']) : null;
}
String? id;
String? updatedAt;
String? username;
String? name;
String? firstName;
dynamic lastName;
dynamic twitterUsername;
String? portfolioUrl;
String? bio;
dynamic location;
Links? links;
ProfileImage? profileImage;
String? instagramUsername;
int? totalCollections;
int? totalLikes;
int? totalPhotos;
bool? acceptedTos;
bool? forHire;
Social? social;
}
notice that each element that contains other elements inside is with a special data type like Urls Links Sponsorship User in the first class, and Links ProfileImage Social in the second class. so each of these data types is a class on its own but I only mentioned the class User to let you continue the rest of the code.
Happy Coding ;)
I successfully called http cho the ProductModel and now i dont know how to get the ProductDrugModel to show along with ProductModel
this is my Model1:
class ProductModel {
String productID;
String drugbankID;
String productName;
String productLabeller;
String productCode;
String productRoute;
String productStrength;
String productdosage;
String approved;
String otc;
String generic;
String country;
ProductModel(
{this.productID,
this.drugbankID,
this.productName,
this.productLabeller,
this.productCode,
this.productRoute,
this.productStrength,
this.productdosage,
this.approved,
this.otc,
this.generic,
this.country});
ProductModel.fromJson(Map<String, dynamic> json) {
productID = json['productID'];
drugbankID = json['drugbankID'];
productName = json['productName'];
productLabeller = json['productLabeller'];
productCode = json['productCode'];
productRoute = json['productRoute'];
productStrength = json['productStrength'];
productdosage = json['productdosage'];
approved = json['approved'];
otc = json['otc'];
generic = json['generic'];
country = json['country'];
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
data['productID'] = this.productID;
data['drugbankID'] = this.drugbankID;
data['productName'] = this.productName;
data['productLabeller'] = this.productLabeller;
data['productCode'] = this.productCode;
data['productRoute'] = this.productRoute;
data['productStrength'] = this.productStrength;
data['productdosage'] = this.productdosage;
data['approved'] = this.approved;
data['otc'] = this.otc;
data['generic'] = this.generic;
data['country'] = this.country;
return data;
}
}
Model2:
class ProductDrugModel {
String drugbankID;
String drugName;
String drugDescription;
String drugState;
String drugIndication;
String drugPharmaco;
String drugMechan;
String drugToxicity;
String drugMetabolism;
String drugHalflife;
String drugElimination;
String drugClearance;
ProductDrugModel({
this.drugbankID,
this.drugName,
this.drugDescription,
this.drugState,
this.drugIndication,
this.drugPharmaco,
this.drugMechan,
this.drugToxicity,
this.drugMetabolism,
this.drugHalflife,
this.drugElimination,
this.drugClearance,
});
factory ProductDrugModel.fromJson(Map<String, dynamic> json) {
return ProductDrugModel(
drugbankID: json['drugbank_ID'],
drugName: json['drugName'],
drugDescription: json['drugDescription'],
drugState: json['drugState'],
drugIndication: json['drugIndication'],
drugPharmaco: json['drugPharmaco'],
drugMechan: json['drugMechan'],
drugToxicity: json['drugToxicity'],
drugMetabolism: json['drugMetabolism'],
drugHalflife: json['drugHalflife'],
drugElimination: json['drugElimination'],
drugClearance: json['drugClearance'],
);
}
}
My api call
class RecommenedData {
static Future<List<ProductModel>> getRecommened() async {
try {
var response =
await
http.get(Uri.parse(Constants.PRODUCT_RECOMMENDED_TOP_10));
if (response.statusCode == 200) {
List listTrend = json.decode(response.body) as List;
return listTrend.map((e) =>
ProductModel.fromJson(e)).toList();
} else {
throw Exception("Failed to fetch data");
}
} catch (e) {
throw Exception("No Internet Connection");
}
}
}
ProductDrugModel
This is how i get the ProductDrugModel object
THe input will be from ProductModel drugbankID
class ProductDrugInfoService {
static Future<List<ProductDrugModel>> getProductDrugInfo(String input) async {
try {
var response =
await http.get(Uri.parse(Constants.PRODUCT_DRUG_INFOR + input));
if (response.statusCode == 200) {
List listTrend = json.decode(response.body) as List;
return listTrend.map((e) => ProductDrugModel.fromJson(e)).toList();
} else {
throw Exception("Failed to fetch data");
}
} catch (e) {
throw Exception("No Internet Connection");
}
}
}
I want to get data from ProductDrugModel by pass the drugbankID to endponit url
then show that data to the UI along with ProductModel
Any suggestion ??
Please help ><
i have one List (growable) with an item (actually item 0:
items is of class Team
items[_id = 1, _team = "Team01", _note = "blabla"]
and I want to transfer it into another list with a different structure:
participants is of class User
participants[id = 1, name = "participant1"]
skipping the note and translating _id into id and so on.So at last the result would give me
participants[id = 1, name = "team01"]
(sorry for the writing, I describe it out of the debugger)
i tried something like this, but doesnt work with value:
List<TestTeam> participants;
for (var value in items) {
participants.add(new TestTeam(value.id, value.team));
}
my class Team is defined like this:
class Team {
int _id;
String _team;
String _note;
Team(this._team, this._note);
Team.map(dynamic obj) {
this._id = obj['id'];
this._team = obj['team'];
this._note = obj['note'];
}
int get id => _id;
String get team => _team;
String get note => _note;
Map<String, dynamic> toMap() {
var map = new Map<String, dynamic>();
if (_id != null) {
map['id'] = _id;
}
map['team'] = _team;
map['note'] = _note;
return map;
}
Team.fromMap(Map<String, dynamic> map) {
this._id = map['id'];
this._team = map['team'];
this._note = map['note'];
}
}
You should implement below way
void main() {
List<Team> teams=[];
List<User> participants=[];
for (var i = 0; i < 4; i++) {
teams.add(Team(i,'Team_$i','Note_$i'));
}
for (var value in teams){
participants.add(User(value.id,value.team));
}
for (var value in teams){
print(value.toString());
}
for (var value in participants){
print(value.toString());
}
}
class Team{
int id;
String team;
String note;
Team(this.id,this.team,this.note);
toString()=> 'Team Map :{id:$id,team:$team,note:$note}';
}
class User{
int id;
String team;
User(this.id,this.team);
toString()=> 'User Map :{id:$id,team:$team}';
}
Output
Team Map :{id:0,team:Team_0,note:Note_0}
Team Map :{id:1,team:Team_1,note:Note_1}
Team Map :{id:2,team:Team_2,note:Note_2}
Team Map :{id:3,team:Team_3,note:Note_3}
User Map :{id:0,team:Team_0}
User Map :{id:1,team:Team_1}
User Map :{id:2,team:Team_2}
User Map :{id:3,team:Team_3}