Mixing
Flutter: _InternalLinkedHashMap has no instance > method 'cast'
0
Sthg makes me crazy, I try to show json products in cards and it doesn't work. Here is what I tried so far:
Product class :
class Product {
final String id;
Product({this.id});
factory Product.fromJson(Map<String, dynamic> json) {
return new Product(
id: json['id'] as String
);
}
}
JSON:
Future loadProducts() async {
final response = await http.get('https://api.stripe.com/v1/products');
return response.body;
}
The json has the following structure (data contains a list of products):
Widget:
Widget get _homeView {
return new Column(
children: <Widget>[
new FutureBuilder(
future: loadProducts(),
builder: (context, snapshot) {
List<Product> products = parseJson(snapshot.data.toString());
return !products.isEmpty
? new ProductsList(product: products)
: new CircularProgressIndicator();
}
),
...
]
);
}
List<Product> parseJson(String response) {
final parsed = json.decode(response.toString()).cast<Map<String, dynamic>>();
return parsed.map<Product>((json) => new Product.fromJson(json)).toList();
}
ProductsList class:
class ProductsList extends StatelessWidget {
final List<Product> product;
ProductsList({Key key, this.product}) : super(key: key);
@override
Widget build(BuildContext context) {
return new ListView.builder(
itemCount: product == null ? 0 : product.length,
itemBuilder: (BuildContext context, int index) {
return new Card(
child: new Container(
children: <Widget>[
new Text(product[index].id),
],
)
);
}
);
}
}
Error :
Class '_InternalLinkedHashMap' has no instance
method 'cast' with matching arguments.
Edit 1 :
I tried :
Error :
dart 
flutter asked Nov 19 '18 at 15:55
Julien
76221031
add a comment |
0
Sthg makes me crazy, I try to show json products in cards and it doesn't work. Here is what I tried so far:
Product class :
class Product {
final String id;
Product({this.id});
factory Product.fromJson(Map<String, dynamic> json) {
return new Product(
id: json['id'] as String
);
}
}
JSON:
Future loadProducts() async {
final response = await http.get('https://api.stripe.com/v1/products');
return response.body;
}
The json has the following structure (data contains a list of products):
Widget:
Widget get _homeView {
return new Column(
children: <Widget>[
new FutureBuilder(
future: loadProducts(),
builder: (context, snapshot) {
List<Product> products = parseJson(snapshot.data.toString());
return !products.isEmpty
? new ProductsList(product: products)
: new CircularProgressIndicator();
}
),
...
]
);
}
List<Product> parseJson(String response) {
final parsed = json.decode(response.toString()).cast<Map<String, dynamic>>();
return parsed.map<Product>((json) => new Product.fromJson(json)).toList();
}
ProductsList class:
class ProductsList extends StatelessWidget {
final List<Product> product;
ProductsList({Key key, this.product}) : super(key: key);
@override
Widget build(BuildContext context) {
return new ListView.builder(
itemCount: product == null ? 0 : product.length,
itemBuilder: (BuildContext context, int index) {
return new Card(
child: new Container(
children: <Widget>[
new Text(product[index].id),
],
)
);
}
);
}
}
Error :
Class '_InternalLinkedHashMap' has no instance
method 'cast' with matching arguments.
Edit 1 :
I tried :
Error :
dart flutter asked Nov 19 '18 at 15:55
Julien
76221031
The method exists though api.dartlang.org/stable/2.1.0/dart-core/Map/cast.html What Dart version are you using?
– Günter Zöchbauer
Nov 19 '18 at 16:02
I updated my answer.
– Günter Zöchbauer
Nov 19 '18 at 16:04
Just for reference, this article is quite handy for explaining parsing JSON in Flutter and I find myself going back to it every now and then.
– SnakeyHips
Nov 19 '18 at 16:08
I'm using Dart2 @GünterZöchbauer
– Julien
Nov 19 '18 at 16:28
add a comment |
0
0
0
Sthg makes me crazy, I try to show json products in cards and it doesn't work. Here is what I tried so far:
Product class :
class Product {
final String id;
Product({this.id});
factory Product.fromJson(Map<String, dynamic> json) {
return new Product(
id: json['id'] as String
);
}
}
JSON:
Future loadProducts() async {
final response = await http.get('https://api.stripe.com/v1/products');
return response.body;
}
The json has the following structure (data contains a list of products):
Widget:
Widget get _homeView {
return new Column(
children: <Widget>[
new FutureBuilder(
future: loadProducts(),
builder: (context, snapshot) {
List<Product> products = parseJson(snapshot.data.toString());
return !products.isEmpty
? new ProductsList(product: products)
: new CircularProgressIndicator();
}
),
...
]
);
}
List<Product> parseJson(String response) {
final parsed = json.decode(response.toString()).cast<Map<String, dynamic>>();
return parsed.map<Product>((json) => new Product.fromJson(json)).toList();
}
ProductsList class:
class ProductsList extends StatelessWidget {
final List<Product> product;
ProductsList({Key key, this.product}) : super(key: key);
@override
Widget build(BuildContext context) {
return new ListView.builder(
itemCount: product == null ? 0 : product.length,
itemBuilder: (BuildContext context, int index) {
return new Card(
child: new Container(
children: <Widget>[
new Text(product[index].id),
],
)
);
}
);
}
}
Error :
Class '_InternalLinkedHashMap' has no instance
method 'cast' with matching arguments.
Edit 1 :
I tried :
Error :
dart flutter asked Nov 19 '18 at 15:55
Julien
76221031
Sthg makes me crazy, I try to show json products in cards and it doesn't work. Here is what I tried so far:
Product class :
class Product {
final String id;
Product({this.id});
factory Product.fromJson(Map<String, dynamic> json) {
return new Product(
id: json['id'] as String
);
}
}
JSON:
Future loadProducts() async {
final response = await http.get('https://api.stripe.com/v1/products');
return response.body;
}
The json has the following structure (data contains a list of products):
Widget:
Widget get _homeView {
return new Column(
children: <Widget>[
new FutureBuilder(
future: loadProducts(),
builder: (context, snapshot) {
List<Product> products = parseJson(snapshot.data.toString());
return !products.isEmpty
? new ProductsList(product: products)
: new CircularProgressIndicator();
}
),
...
]
);
}
List<Product> parseJson(String response) {
final parsed = json.decode(response.toString()).cast<Map<String, dynamic>>();
return parsed.map<Product>((json) => new Product.fromJson(json)).toList();
}
ProductsList class:
class ProductsList extends StatelessWidget {
final List<Product> product;
ProductsList({Key key, this.product}) : super(key: key);
@override
Widget build(BuildContext context) {
return new ListView.builder(
itemCount: product == null ? 0 : product.length,
itemBuilder: (BuildContext context, int index) {
return new Card(
child: new Container(
children: <Widget>[
new Text(product[index].id),
],
)
);
}
);
}
}
Error :
Class '_InternalLinkedHashMap' has no instance
method 'cast' with matching arguments.
Edit 1 :
I tried :
Error :
dart flutter dart flutter asked Nov 19 '18 at 15:55
Julien
76221031
asked Nov 19 '18 at 15:55
Julien
76221031
edited Nov 19 '18 at 16:14
asked Nov 19 '18 at 15:55
Julien
76221031
asked Nov 19 '18 at 15:55
Julien
76221031
asked Nov 19 '18 at 15:55
Julien
76221031
76221031
The method exists though api.dartlang.org/stable/2.1.0/dart-core/Map/cast.html What Dart version are you using?
– Günter Zöchbauer
Nov 19 '18 at 16:02
I updated my answer.
– Günter Zöchbauer
Nov 19 '18 at 16:04
Just for reference, this article is quite handy for explaining parsing JSON in Flutter and I find myself going back to it every now and then.
– SnakeyHips
Nov 19 '18 at 16:08
I'm using Dart2 @GünterZöchbauer
– Julien
Nov 19 '18 at 16:28
add a comment |
The method exists though api.dartlang.org/stable/2.1.0/dart-core/Map/cast.html What Dart version are you using?
– Günter Zöchbauer
Nov 19 '18 at 16:02
I updated my answer.
– Günter Zöchbauer
Nov 19 '18 at 16:04
Just for reference, this article is quite handy for explaining parsing JSON in Flutter and I find myself going back to it every now and then.
– SnakeyHips
Nov 19 '18 at 16:08
I'm using Dart2 @GünterZöchbauer
– Julien
Nov 19 '18 at 16:28
The method exists though api.dartlang.org/stable/2.1.0/dart-core/Map/cast.html What Dart version are you using?
– Günter Zöchbauer
Nov 19 '18 at 16:02
The method exists though api.dartlang.org/stable/2.1.0/dart-core/Map/cast.html What Dart version are you using?
– Günter Zöchbauer
Nov 19 '18 at 16:02
I updated my answer.
– Günter Zöchbauer
Nov 19 '18 at 16:04
I updated my answer.
– Günter Zöchbauer
Nov 19 '18 at 16:04
Just for reference, this article is quite handy for explaining parsing JSON in Flutter and I find myself going back to it every now and then.
– SnakeyHips
Nov 19 '18 at 16:08
Just for reference, this article is quite handy for explaining parsing JSON in Flutter and I find myself going back to it every now and then.
– SnakeyHips
Nov 19 '18 at 16:08
I'm using Dart2 @GünterZöchbauer
– Julien
Nov 19 '18 at 16:28
I'm using Dart2 @GünterZöchbauer
– Julien
Nov 19 '18 at 16:28
add a comment |
1 Answer
1
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This is my usual method for parsing a json list of objects (bit simpler but it works):
List<Product> parseJson(String response) {
List<Product> products = new List<Product>();
List jsonParsed = json.decode(response.toString());
for (int i = 0; i < jsonParsed.length; i++) {
products.add(new Product.fromJson(jsonParsed[i]));
}
return products;
}
answered Nov 19 '18 at 16:29
SnakeyHips
550111
add a comment |
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1 Answer
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active
oldest
votes
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oldest
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active
oldest
votes
0
This is my usual method for parsing a json list of objects (bit simpler but it works):
List<Product> parseJson(String response) {
List<Product> products = new List<Product>();
List jsonParsed = json.decode(response.toString());
for (int i = 0; i < jsonParsed.length; i++) {
products.add(new Product.fromJson(jsonParsed[i]));
}
return products;
}
answered Nov 19 '18 at 16:29
SnakeyHips
550111
add a comment |
0
This is my usual method for parsing a json list of objects (bit simpler but it works):
List<Product> parseJson(String response) {
List<Product> products = new List<Product>();
List jsonParsed = json.decode(response.toString());
for (int i = 0; i < jsonParsed.length; i++) {
products.add(new Product.fromJson(jsonParsed[i]));
}
return products;
}
answered Nov 19 '18 at 16:29
SnakeyHips
550111
add a comment |
0
0
0
This is my usual method for parsing a json list of objects (bit simpler but it works):
List<Product> parseJson(String response) {
List<Product> products = new List<Product>();
List jsonParsed = json.decode(response.toString());
for (int i = 0; i < jsonParsed.length; i++) {
products.add(new Product.fromJson(jsonParsed[i]));
}
return products;
}
answered Nov 19 '18 at 16:29
SnakeyHips
550111
This is my usual method for parsing a json list of objects (bit simpler but it works):
List<Product> parseJson(String response) {
List<Product> products = new List<Product>();
List jsonParsed = json.decode(response.toString());
for (int i = 0; i < jsonParsed.length; i++) {
products.add(new Product.fromJson(jsonParsed[i]));
}
return products;
}
answered Nov 19 '18 at 16:29
SnakeyHips
550111
answered Nov 19 '18 at 16:29
SnakeyHips
550111
answered Nov 19 '18 at 16:29
SnakeyHips
550111
answered Nov 19 '18 at 16:29
SnakeyHips
550111
550111
add a comment |
add a comment |
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The method exists though api.dartlang.org/stable/2.1.0/dart-core/Map/cast.html What Dart version are you using?
– Günter Zöchbauer
Nov 19 '18 at 16:02
I updated my answer.
– Günter Zöchbauer
Nov 19 '18 at 16:04
Just for reference, this article is quite handy for explaining parsing JSON in Flutter and I find myself going back to it every now and then.
– SnakeyHips
Nov 19 '18 at 16:08
I'm using Dart2 @GünterZöchbauer
– Julien
Nov 19 '18 at 16:28