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Flutter _TypeError (type 'List' is not a subtype of type 'Map')

Flutter get " type 'List<dynamic>' is not a subtype of type 'Map<String, dynamic>' in type cast errortype List<dynamic> is not a subtype of type 'Map<String, dynamic>'type 'List<dynamic>' is not a subtype of type 'List<Widget>'Flutter - SQflite '_InternalLinkedHashMap<dynamic, dynamic>' is not a subtype of type 'Map<String, dynamic>'type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'List<Map<String, dynamic>>'type 'List<dynamic>' is not a subtype of type 'List<Map<dynamic, dynamic>>'flutter: type 'List<dynamic>' is not a subtype of type 'String'How to convert Latin to Ibm charset on Dart and Flutter?Flutter: type 'List<dynamic>' is not a subtype of type 'List<Widget>'Flutter _TypeError type 'List<dynamic>' is not a subtype of type 'Map<String, dynamic>Unhandled Exception: type 'List<dynamic>' is not a subtype of type 'Map<String, dynamic>'Flutter get " type 'List<dynamic>' is not a subtype of type 'Map<String, dynamic>' in type cast error

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;

1

I am new to flutter and getting type error. I am trying to use json automated serializations.

AFTER DOING SOME TWEAKS HERE IS HOW IT LOOKS LIKE

Here is how I am trying to get the data from api

 Future getMyProduct() async 
 final res = await http.get('url');
 final data = json.decode(res.body);
 BaseResponse req = new BaseResponse.fromJson(data);
 return req;
 

My BaseResponse class looks like this

import 'package:dynamicapp/model/model.dart';
import 'package:json_annotation/json_annotation.dart';

part 'response.g.dart';

@JsonSerializable()
class BaseResponse extends Object 
 final int id;

final int sellingPrice;
final int totalStock;
final String productName;
final String productDesc;
final List<Image> images;

BaseResponse(this.id, this.sellingPrice, this.totalStock, this.productName,
 this.productDesc, this.images);

factory BaseResponse.fromJson(Map<String, dynamic> json) => _$BaseResponseFromJson(json);

Map<String, dynamic> toJson() => _$BaseResponseToJson(this);


@JsonSerializable()
 class Image extends Object 
 final int id;
 final String image;
// final int product_id;

 Image(this.id, this.image);
factory Image.fromJson(Map<String, dynamic> json) => _$ImageFromJson(json);
 Map<String, dynamic> toJson() => _$ImageToJson(this);

Could anyone please help me with this. I am stuck here. Have been trying different methods but none working. Thank you.

dart flutter

share|improve this question

edited Jun 10 at 11:28

DolDurma

3,9281717 gold badges8383 silver badges156156 bronze badges

asked Mar 27 at 22:50

Shakil AhmedShakil Ahmed

82177 silver badges3333 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  change json.decode to jsonDecode . Look this: flutter.dev/docs/development/data-and-backend/json
  
  – Rubens Melo
  Mar 27 at 22:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It gives same error. I followed exactly like documentations. Still same error
  
  – Shakil Ahmed
  Mar 27 at 23:04
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  try change final data to final Map data to explicit the return type of jsonDecode
  
  – Rubens Melo
  Mar 27 at 23:09
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It gives the same error final Map data = jsonDecode(res.body); var p = BaseResponse.fromJson(data); How can I convert the BaseResponse.fromJson(data) into a list instead of a map?
  
  – Shakil Ahmed
  Mar 27 at 23:16
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  OK I got the problem. It returns an array of items and in the BaseResponse call I have Object. So if I write BaseResponse.fromJson(jsonresponse[0]); it works with 0 index. But how can I make a list of array?
  
  – Shakil Ahmed
  Mar 27 at 23:26
  

  
  
  
  

 | 
show 3 more comments

1

I am new to flutter and getting type error. I am trying to use json automated serializations.

AFTER DOING SOME TWEAKS HERE IS HOW IT LOOKS LIKE

Here is how I am trying to get the data from api

 Future getMyProduct() async 
 final res = await http.get('url');
 final data = json.decode(res.body);
 BaseResponse req = new BaseResponse.fromJson(data);
 return req;
 

My BaseResponse class looks like this

import 'package:dynamicapp/model/model.dart';
import 'package:json_annotation/json_annotation.dart';

part 'response.g.dart';

@JsonSerializable()
class BaseResponse extends Object 
 final int id;

final int sellingPrice;
final int totalStock;
final String productName;
final String productDesc;
final List<Image> images;

BaseResponse(this.id, this.sellingPrice, this.totalStock, this.productName,
 this.productDesc, this.images);

factory BaseResponse.fromJson(Map<String, dynamic> json) => _$BaseResponseFromJson(json);

Map<String, dynamic> toJson() => _$BaseResponseToJson(this);


@JsonSerializable()
 class Image extends Object 
 final int id;
 final String image;
// final int product_id;

 Image(this.id, this.image);
factory Image.fromJson(Map<String, dynamic> json) => _$ImageFromJson(json);
 Map<String, dynamic> toJson() => _$ImageToJson(this);

Could anyone please help me with this. I am stuck here. Have been trying different methods but none working. Thank you.

dart flutter

share|improve this question

edited Jun 10 at 11:28

DolDurma

3,9281717 gold badges8383 silver badges156156 bronze badges

asked Mar 27 at 22:50

Shakil AhmedShakil Ahmed

82177 silver badges3333 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  change json.decode to jsonDecode . Look this: flutter.dev/docs/development/data-and-backend/json
  
  – Rubens Melo
  Mar 27 at 22:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It gives same error. I followed exactly like documentations. Still same error
  
  – Shakil Ahmed
  Mar 27 at 23:04
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  try change final data to final Map data to explicit the return type of jsonDecode
  
  – Rubens Melo
  Mar 27 at 23:09
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It gives the same error final Map data = jsonDecode(res.body); var p = BaseResponse.fromJson(data); How can I convert the BaseResponse.fromJson(data) into a list instead of a map?
  
  – Shakil Ahmed
  Mar 27 at 23:16
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  OK I got the problem. It returns an array of items and in the BaseResponse call I have Object. So if I write BaseResponse.fromJson(jsonresponse[0]); it works with 0 index. But how can I make a list of array?
  
  – Shakil Ahmed
  Mar 27 at 23:26
  

  
  
  
  

 | 
show 3 more comments

I am new to flutter and getting type error. I am trying to use json automated serializations.

AFTER DOING SOME TWEAKS HERE IS HOW IT LOOKS LIKE

Here is how I am trying to get the data from api

 Future getMyProduct() async 
 final res = await http.get('url');
 final data = json.decode(res.body);
 BaseResponse req = new BaseResponse.fromJson(data);
 return req;
 

My BaseResponse class looks like this

import 'package:dynamicapp/model/model.dart';
import 'package:json_annotation/json_annotation.dart';

part 'response.g.dart';

@JsonSerializable()
class BaseResponse extends Object 
 final int id;

final int sellingPrice;
final int totalStock;
final String productName;
final String productDesc;
final List<Image> images;

BaseResponse(this.id, this.sellingPrice, this.totalStock, this.productName,
 this.productDesc, this.images);

factory BaseResponse.fromJson(Map<String, dynamic> json) => _$BaseResponseFromJson(json);

Map<String, dynamic> toJson() => _$BaseResponseToJson(this);


@JsonSerializable()
 class Image extends Object 
 final int id;
 final String image;
// final int product_id;

 Image(this.id, this.image);
factory Image.fromJson(Map<String, dynamic> json) => _$ImageFromJson(json);
 Map<String, dynamic> toJson() => _$ImageToJson(this);

Could anyone please help me with this. I am stuck here. Have been trying different methods but none working. Thank you.

dart flutter

share|improve this question

edited Jun 10 at 11:28

DolDurma

3,9281717 gold badges8383 silver badges156156 bronze badges

asked Mar 27 at 22:50

Shakil AhmedShakil Ahmed

82177 silver badges3333 bronze badges

 Future getMyProduct() async 
 final res = await http.get('url');
 final data = json.decode(res.body);
 BaseResponse req = new BaseResponse.fromJson(data);
 return req;
 

import 'package:dynamicapp/model/model.dart';
import 'package:json_annotation/json_annotation.dart';

part 'response.g.dart';

@JsonSerializable()
class BaseResponse extends Object 
 final int id;

final int sellingPrice;
final int totalStock;
final String productName;
final String productDesc;
final List<Image> images;

BaseResponse(this.id, this.sellingPrice, this.totalStock, this.productName,
 this.productDesc, this.images);

factory BaseResponse.fromJson(Map<String, dynamic> json) => _$BaseResponseFromJson(json);

Map<String, dynamic> toJson() => _$BaseResponseToJson(this);


@JsonSerializable()
 class Image extends Object 
 final int id;
 final String image;
// final int product_id;

 Image(this.id, this.image);
factory Image.fromJson(Map<String, dynamic> json) => _$ImageFromJson(json);
 Map<String, dynamic> toJson() => _$ImageToJson(this);

dart flutter

dart flutter

share|improve this question

edited Jun 10 at 11:28

DolDurma

3,9281717 gold badges8383 silver badges156156 bronze badges

asked Mar 27 at 22:50

Shakil AhmedShakil Ahmed

82177 silver badges3333 bronze badges

share|improve this question

edited Jun 10 at 11:28

DolDurma

3,9281717 gold badges8383 silver badges156156 bronze badges

asked Mar 27 at 22:50

Shakil AhmedShakil Ahmed

82177 silver badges3333 bronze badges

edited Jun 10 at 11:28

DolDurma

3,9281717 gold badges8383 silver badges156156 bronze badges

edited Jun 10 at 11:28

DolDurma

3,9281717 gold badges8383 silver badges156156 bronze badges

asked Mar 27 at 22:50

Shakil AhmedShakil Ahmed

82177 silver badges3333 bronze badges

asked Mar 27 at 22:50

Shakil AhmedShakil Ahmed

82177 silver badges3333 bronze badges

1 Answer
1

active

oldest

votes

0

It looks like data is a List<dynamic>, then data.map(someFunc).toList() will take each element of data pass it to someFunc and form it back into a list of the return type of someFunc (which you will presumably want to be BaseResponse). Which tells you that someFunc needs to be a function that takes dynamic and returns BaseResponse.

You'd want to write something like this:

 final data = json.decode(res.body);
 List<BaseResponse> responses =
 data.map((j) => BaseResponse.fromJson(j)).toList();

share|improve this answer

answered Mar 27 at 23:52

Richard HeapRichard Heap

12.7k22 gold badges1717 silver badges3232 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  could you help me on this issue? https://stackoverflow.com/q/56524623/1830228 thanks
  
  – DolDurma
  Jun 10 at 11:23
  

  
  
  
  

add a comment | 

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0

It looks like data is a List<dynamic>, then data.map(someFunc).toList() will take each element of data pass it to someFunc and form it back into a list of the return type of someFunc (which you will presumably want to be BaseResponse). Which tells you that someFunc needs to be a function that takes dynamic and returns BaseResponse.

You'd want to write something like this:

 final data = json.decode(res.body);
 List<BaseResponse> responses =
 data.map((j) => BaseResponse.fromJson(j)).toList();

share|improve this answer

answered Mar 27 at 23:52

Richard HeapRichard Heap

12.7k22 gold badges1717 silver badges3232 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  could you help me on this issue? https://stackoverflow.com/q/56524623/1830228 thanks
  
  – DolDurma
  Jun 10 at 11:23
  

  
  
  
  

add a comment | 

0

It looks like data is a List<dynamic>, then data.map(someFunc).toList() will take each element of data pass it to someFunc and form it back into a list of the return type of someFunc (which you will presumably want to be BaseResponse). Which tells you that someFunc needs to be a function that takes dynamic and returns BaseResponse.

You'd want to write something like this:

 final data = json.decode(res.body);
 List<BaseResponse> responses =
 data.map((j) => BaseResponse.fromJson(j)).toList();

share|improve this answer

answered Mar 27 at 23:52

Richard HeapRichard Heap

12.7k22 gold badges1717 silver badges3232 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  could you help me on this issue? https://stackoverflow.com/q/56524623/1830228 thanks
  
  – DolDurma
  Jun 10 at 11:23
  

  
  
  
  

add a comment | 

It looks like data is a List<dynamic>, then data.map(someFunc).toList() will take each element of data pass it to someFunc and form it back into a list of the return type of someFunc (which you will presumably want to be BaseResponse). Which tells you that someFunc needs to be a function that takes dynamic and returns BaseResponse.

You'd want to write something like this:

 final data = json.decode(res.body);
 List<BaseResponse> responses =
 data.map((j) => BaseResponse.fromJson(j)).toList();

share|improve this answer

answered Mar 27 at 23:52

Richard HeapRichard Heap

12.7k22 gold badges1717 silver badges3232 bronze badges

 final data = json.decode(res.body);
 List<BaseResponse> responses =
 data.map((j) => BaseResponse.fromJson(j)).toList();

share|improve this answer

answered Mar 27 at 23:52

Richard HeapRichard Heap

12.7k22 gold badges1717 silver badges3232 bronze badges

answered Mar 27 at 23:52

Richard HeapRichard Heap

12.7k22 gold badges1717 silver badges3232 bronze badges

answered Mar 27 at 23:52

Richard HeapRichard Heap

12.7k22 gold badges1717 silver badges3232 bronze badges