我無法弄清楚如何使我的飛鏢模型適應我的 json。我經常在 BreedInfo 類中遇到錯誤，欄位高度：
_TypeError (type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'String?')
我不知道如果動態應該自動識別資料型別并且因此無論如何它都是字串，它為什么不接受回應。
我的飛鏢模型：
import 'dart:core';
class DogClass {
Id? _iId;
String? _breed;
String? _origin;
String? _url;
String? _img;
BreedInfo? _breedInfo;
BreedInfo? _breedInfo1;
List<String>? _behavior;
DogClass(
{Id? iId,
String? breed,
String? origin,
String? url,
String? img,
BreedInfo? breedInfo,
BreedInfo? breedInfo1,
List<String>? behavior}) {
if (iId != null) {
this._iId = iId;
}
if (breed != null) {
this._breed = breed;
}
if (origin != null) {
this._origin = origin;
}
if (url != null) {
this._url = url;
}
if (img != null) {
this._img = img;
}
if (breedInfo != null) {
this._breedInfo = breedInfo;
}
if (breedInfo1 != null) {
this._breedInfo1 = breedInfo1;
}
if (behavior != null) {
this._behavior = behavior;
}
}
Id? get iId => _iId;
set iId(Id? iId) => _iId = iId;
String? get breed => _breed;
set breed(String? breed) => _breed = breed;
String? get origin => _origin;
set origin(String? origin) => _origin = origin;
String? get url => _url;
set url(String? url) => _url = url;
String? get img => _img;
set img(String? img) => _img = img;
BreedInfo? get breedInfo => _breedInfo;
set breedInfo(BreedInfo? breedInfo) => _breedInfo = breedInfo;
BreedInfo? get breedInfo1 => _breedInfo1;
set breedInfo1(BreedInfo? breedInfo1) => _breedInfo1 = breedInfo1;
List<String>? get behavior => _behavior;
set behavior(List<String>? string) => _behavior = string;
DogClass.fromJson(Map<String, dynamic> json) {
_iId = json['_id'] != null ? Id.fromJson(json['_id']) : null;
_breed = json['breed'];
_origin = json['origin'];
_url = json['url'];
_img = json['img'];
_breedInfo = json['breed_info'] != null
? new BreedInfo.fromJson(json['breed_info'])
: null;
_breedInfo1 = json['breed_info1'] != null
? new BreedInfo.fromJson(json['breed_info1'])
: null;
if (json['behavior'] != null) {
List<dynamic> _behavior = [];
json['behavior'].forEach((v) {
_behavior.add(Behavior.fromJson(v));
});
}
}
}
class Id {
String? _oid;
Id({String? oid}) {
if (oid != null) {
_oid = oid;
}
}
String? get oid => _oid;
set oid(String? oid) => _oid = oid;
Id.fromJson(Map<String, dynamic> json) {
_oid = json['$oid'];
}
}
class BreedInfo {
String? _height;
String? _weight;
String? _coat;
List<String>? _imgSrcSet;
String? _lifeSpan;
String? _otherNames;
String? _commonNicknames;
String? _colour;
String? _litterSize;
String? _notes;
String? _breedStatus;
String? _foundationStock;
BreedInfo(
{String? height,
String? weight,
String? coat,
List<String>? imgSrcSet,
String? lifeSpan,
String? otherNames,
String? commonNicknames,
String? colour,
String? litterSize,
String? notes,
String? breedStatus,
String? foundationStock}) {
if (height != null) {
this._height = height;
}
if (weight != null) {
this._weight = weight;
}
if (coat != null) {
this._coat = coat;
}
if (imgSrcSet != null) {
this._imgSrcSet = imgSrcSet;
}
if (lifeSpan != null) {
this._lifeSpan = lifeSpan;
}
if (otherNames != null) {
this._otherNames = otherNames;
}
if (commonNicknames != null) {
this._commonNicknames = commonNicknames;
}
if (colour != null) {
this._colour = colour;
}
if (litterSize != null) {
this._litterSize = litterSize;
}
if (notes != null) {
this._notes = notes;
}
if (breedStatus != null) {
this._breedStatus = breedStatus;
}
if (foundationStock != null) {
this._foundationStock = foundationStock;
}
}
String? get height => _height;
set height(String? height) => _height = height;
String? get weight => _weight;
set weight(String? weight) => _weight = weight;
String? get coat => _coat;
set coat(String? coat) => _coat = coat;
List<String>? get imgSrcSet => _imgSrcSet;
set imgSrcSet(List<String>? imgSrcSet) => _imgSrcSet = imgSrcSet;
String? get lifeSpan => _lifeSpan;
set lifeSpan(String? lifeSpan) => _lifeSpan = lifeSpan;
String? get otherNames => _otherNames;
set otherNames(String? otherNames) => _otherNames = otherNames;
String? get commonNicknames => _commonNicknames;
set commonNicknames(String? commonNicknames) =>
_commonNicknames = commonNicknames;
String? get colour => _colour;
set colour(String? colour) => _colour = colour;
String? get litterSize => _litterSize;
set litterSize(String? litterSize) => _litterSize = litterSize;
String? get notes => _notes;
set notes(String? notes) => _notes = notes;
String? get breedStatus => _breedStatus;
set breedStatus(String? breedStatus) => _breedStatus = breedStatus;
String? get foundationStock => _foundationStock;
set foundationStock(String? foundationStock) =>
_foundationStock = foundationStock;
BreedInfo.fromJson(Map<String?, dynamic> json) {
_height = json['height'];
_weight = json['weight'];
_coat = json['coat'];
_lifeSpan = json['life_span'];
_otherNames = json['other_names'];
_commonNicknames = json['common_nicknames'];
_colour = json['colour'];
_litterSize = json['litter_size'];
_notes = json['notes'];
_breedStatus = json['breed_status'];
_foundationStock = json['foundation_stock'];
}
}
class Behavior {
Id? _iId;
String? _imageLink;
int? _goodWithChildren;
int? _goodWithOtherDogs;
int? _shedding;
int? _grooming;
int? _drooling;
int? _coatLength;
int? _goodWithStrangers;
int? _playfulness;
int? _protectiveness;
int? _trainability;
int? _energy;
int? _barking;
int? _minLifeExpectancy;
int? _maxLifeExpectancy;
double? _maxHeightMale;
double? _maxHeightFemale;
int? _maxWeightMale;
int? _maxWeightFemale;
int? _minHeightMale;
int? _minHeightFemale;
int? _minWeightMale;
int? _minWeightFemale;
String? _breed;
Behavior(
{Id? iId,
String? imageLink,
int? goodWithChildren,
int? goodWithOtherDogs,
int? shedding,
int? grooming,
int? drooling,
int? coatLength,
int? goodWithStrangers,
int? playfulness,
int? protectiveness,
int? trainability,
int? energy,
int? barking,
int? minLifeExpectancy,
int? maxLifeExpectancy,
double? maxHeightMale,
double? maxHeightFemale,
int? maxWeightMale,
int? maxWeightFemale,
int? minHeightMale,
int? minHeightFemale,
int? minWeightMale,
int? minWeightFemale,
String? breed}) {
if (iId != null) {
this._iId = iId;
}
if (imageLink != null) {
this._imageLink = imageLink;
}
if (goodWithChildren != null) {
this._goodWithChildren = goodWithChildren;
}
if (goodWithOtherDogs != null) {
this._goodWithOtherDogs = goodWithOtherDogs;
}
if (shedding != null) {
this._shedding = shedding;
}
if (grooming != null) {
this._grooming = grooming;
}
if (drooling != null) {
this._drooling = drooling;
}
if (coatLength != null) {
this._coatLength = coatLength;
}
if (goodWithStrangers != null) {
this._goodWithStrangers = goodWithStrangers;
}
if (playfulness != null) {
this._playfulness = playfulness;
}
if (protectiveness != null) {
this._protectiveness = protectiveness;
}
if (trainability != null) {
this._trainability = trainability;
}
if (energy != null) {
this._energy = energy;
}
if (barking != null) {
this._barking = barking;
}
if (minLifeExpectancy != null) {
this._minLifeExpectancy = minLifeExpectancy;
}
if (maxLifeExpectancy != null) {
this._maxLifeExpectancy = maxLifeExpectancy;
}
if (maxHeightMale != null) {
this._maxHeightMale = maxHeightMale;
}
if (maxHeightFemale != null) {
this._maxHeightFemale = maxHeightFemale;
}
if (maxWeightMale != null) {
this._maxWeightMale = maxWeightMale;
}
if (maxWeightFemale != null) {
this._maxWeightFemale = maxWeightFemale;
}
if (minHeightMale != null) {
this._minHeightMale = minHeightMale;
}
if (minHeightFemale != null) {
this._minHeightFemale = minHeightFemale;
}
if (minWeightMale != null) {
this._minWeightMale = minWeightMale;
}
if (minWeightFemale != null) {
this._minWeightFemale = minWeightFemale;
}
if (breed != null) {
this._breed = breed;
}
}
Id? get iId => _iId;
set iId(Id? iId) => _iId = iId;
String? get imageLink => _imageLink;
set imageLink(String? imageLink) => _imageLink = imageLink;
int? get goodWithChildren => _goodWithChildren;
set goodWithChildren(int? goodWithChildren) =>
_goodWithChildren = goodWithChildren;
int? get goodWithOtherDogs => _goodWithOtherDogs;
set goodWithOtherDogs(int? goodWithOtherDogs) =>
_goodWithOtherDogs = goodWithOtherDogs;
int? get shedding => _shedding;
set shedding(int? shedding) => _shedding = shedding;
int? get grooming => _grooming;
set grooming(int? grooming) => _grooming = grooming;
int? get drooling => _drooling;
set drooling(int? drooling) => _drooling = drooling;
int? get coatLength => _coatLength;
set coatLength(int? coatLength) => _coatLength = coatLength;
int? get goodWithStrangers => _goodWithStrangers;
set goodWithStrangers(int? goodWithStrangers) =>
_goodWithStrangers = goodWithStrangers;
int? get playfulness => _playfulness;
set playfulness(int? playfulness) => _playfulness = playfulness;
int? get protectiveness => _protectiveness;
set protectiveness(int? protectiveness) => _protectiveness = protectiveness;
int? get trainability => _trainability;
set trainability(int? trainability) => _trainability = trainability;
int? get energy => _energy;
set energy(int? energy) => _energy = energy;
int? get barking => _barking;
set barking(int? barking) => _barking = barking;
int? get minLifeExpectancy => _minLifeExpectancy;
set minLifeExpectancy(int? minLifeExpectancy) =>
_minLifeExpectancy = minLifeExpectancy;
int? get maxLifeExpectancy => _maxLifeExpectancy;
set maxLifeExpectancy(int? maxLifeExpectancy) =>
_maxLifeExpectancy = maxLifeExpectancy;
double? get maxHeightMale => _maxHeightMale;
set maxHeightMale(double? maxHeightMale) => _maxHeightMale = maxHeightMale;
double? get maxHeightFemale => _maxHeightFemale;
set maxHeightFemale(double? maxHeightFemale) =>
_maxHeightFemale = maxHeightFemale;
int? get maxWeightMale => _maxWeightMale;
set maxWeightMale(int? maxWeightMale) => _maxWeightMale = maxWeightMale;
int? get maxWeightFemale => _maxWeightFemale;
set maxWeightFemale(int? maxWeightFemale) =>
_maxWeightFemale = maxWeightFemale;
int? get minHeightMale => _minHeightMale;
set minHeightMale(int? minHeightMale) => _minHeightMale = minHeightMale;
int? get minHeightFemale => _minHeightFemale;
set minHeightFemale(int? minHeightFemale) =>
_minHeightFemale = minHeightFemale;
int? get minWeightMale => _minWeightMale;
set minWeightMale(int? minWeightMale) => _minWeightMale = minWeightMale;
int? get minWeightFemale => _minWeightFemale;
set minWeightFemale(int? minWeightFemale) =>
_minWeightFemale = minWeightFemale;
String? get breed => _breed;
set breed(String? breed) => _breed = breed;
Behavior.fromJson(Map<String, dynamic> json) {
_iId = json['_id'] != null ? new Id.fromJson(json['_id']) : null;
_imageLink = json['image_link'];
_goodWithChildren = json['good_with_children'];
_goodWithOtherDogs = json['good_with_other_dogs'];
_shedding = json['shedding'];
_grooming = json['grooming'];
_drooling = json['drooling'];
_coatLength = json['coat_length'];
_goodWithStrangers = json['good_with_strangers'];
_playfulness = json['playfulness'];
_protectiveness = json['protectiveness'];
_trainability = json['trainability'];
_energy = json['energy'];
_barking = json['barking'];
_minLifeExpectancy = json['min_life_expectancy'];
_maxLifeExpectancy = json['max_life_expectancy'];
_maxHeightMale = json['max_height_male'];
_maxHeightFemale = json['max_height_female'];
_maxWeightMale = json['max_weight_male'];
_maxWeightFemale = json['max_weight_female'];
_minHeightMale = json['min_height_male'];
_minHeightFemale = json['min_height_female'];
_minWeightMale = json['min_weight_male'];
_minWeightFemale = json['min_weight_female'];
_breed = json['breed'];
}
}
我原來的json：
{ "_id": { "$oid": "625f2900fe6aeb351381c3f3" }, "breed": "Affenpinscher", "origin": "Germany", "url": "https://en.wikipedia.org/wiki/Affenpinscher", "img": "https://upload.wikimedia.org/wikipedia/commons/thumb/1/17/Affenpinscher.jpg/220px-Affenpinscher.jpg", "breed_info": { "height": "23–30 cm (9–12 in)", "weight": "3–6 kg (7–13 lb)", "coat": "Wire", "img_src_set": [ null, { "5x": "https://upload.wikimedia.org/wikipedia/commons/thumb/1/17/Affenpinscher.jpg/330px-Affenpinscher.jpg" } ], "life_span": "Not available", "other_names": "Not available", "common_nicknames": "AffenAffie", "colour": "Not available", "litter_size": "Not available", "notes": "Not available", "breed_status": "Not available", "foundation_stock": "Not available" }, "breed_info1": { "height": "23–30 cm (9–12 in)", "weight": "3–6 kg (7–13 lb)", "coat": "Wire", "img_src_set": [ null, { "5x": "https://upload.wikimedia.org/wikipedia/commons/thumb/1/17/Affenpinscher.jpg/330px-Affenpinscher.jpg" } ], "life_span": "Not available", "other_names": "Not available", "common_nicknames": "AffenAffie", "colour": "Not available", "litter_size": "Not available", "notes": "Not available", "breed_status": "Not available", "foundation_stock": "Not available" }, "string": [ { "_id": { "$oid": "625f2ba9fe6aeb351381c647" }, "image_link": "https://api-ninjas.com/images/dogs/affenpinscher.jpg", "good_with_children": 3, "good_with_other_dogs": 3, "shedding": 3, "grooming": 3, "drooling": 1, "coat_length": 2, "good_with_strangers": 5, "playfulness": 3, "protectiveness": 3, "trainability": 3, "energy": 3, "barking": 3, "min_life_expectancy": 12, "max_life_expectancy": 15, "max_height_male": 11.5, "max_height_female": 11.5, "max_weight_male": 10, "max_weight_female": 10, "min_height_male": 9, "min_height_female": 9, "min_weight_male": 7, "min_weight_female": 7, "breed": "Affenpinscher" } ]}
以及我如何獲取資料：
List<dynamic> BreedList = [];
var client = http.Client();
fetchData(url) async {
final response = await client.get(Uri.parse(url));
if (response.statusCode == 200) {
var jsonDecoded = json.decode(response.body);
BreedList = jsonDecoded
.map((data) => DogClass.fromJson(data))
.toList();
return jsonDecoded;
} else {
throw Exception('Failed to load data');
}
}
uj5u.com熱心網友回復：
在你的班級BreedInfo List<String>? _imgSrcSet;是錯誤的，它必須是
List<Map<String, dynamic>>? _imgSrcSet
//or rather
List<Map<String, String>>? _imgSrcSet
轉載請註明出處，本文鏈接：https://www.uj5u.com/qita/463602.html
上一篇：Jetty請求屬性未跨服務傳播