Flutter Parsed Complex Json - json

Question

I am having a problem on decoding the json from toMap(). I have no Issue on fromJson() function.
My main goal is to save it on shared preferences. all are working except for images i got null values
Here's my toMap() Method:
All Variables are working except for images;
Map<String, dynamic> toMap() {
var map = new Map<String, dynamic>();
ImagesModel img = ImagesModel();
Map<String, dynamic> imagesList = img.toMap();
map["id"] = id;
map["name"] = name;
map["description"] = description;
map["catalog_visibility"] = catalog_visibility;
map["short_description"] = short_description;
map["regular_price"] = regular_price;
map["sale_price"] = sale_price;
map["date_created"] = date_created;
map['images'] = imagesList; --> I got null value on this images
return map;
}
Here's my Image Model
class ImagesModel{
final int id;
final String src;
final String name;
ImagesModel({this.id, this.src, this.name});
factory ImagesModel.fromJSON(Map<String, dynamic> parsedJson){
return ImagesModel(
id: parsedJson['id'],
src: parsedJson['src'],
name: parsedJson['name']
);
}
Map<String, dynamic> toMap() => {
"id": id,
"src": src,
"name" :name,
};
}
My Whole Products Model
class ProductsModel {
final int id;
final String name;
final String catalog_visibility;
final String description;
final String short_description;
final String price;
final String regular_price;
final String sale_price;
final String date_created;
final List<CategoriesModel> categories;
final List<ImagesModel> images;
ProductsModel(
{this.id,
this.name,
this.catalog_visibility,
this.description,
this.short_description,
this.price,
this.regular_price,
this.sale_price,
this.date_created,
this.categories,
this.images
});
factory ProductsModel.fromJSON(Map<String, dynamic> parsedJson) {
var categoriesList = parsedJson['categories'] as List;
var imagesList = parsedJson['images'] as List;
List<ImagesModel> dataImages = imagesList.map((i) => ImagesModel.fromJSON(i)).toList();
List<CategoriesModel> dataCategories =
categoriesList.map((i) => CategoriesModel.fromJSON(i)).toList();
return ProductsModel(
id: parsedJson['id'],
name: parsedJson['name'],
catalog_visibility: parsedJson['catalog_visibility'],
description: parsedJson['description'],
short_description: parsedJson['short_description'],
regular_price: parsedJson['regular_price'],
sale_price: parsedJson['sale_price'],
date_created: parsedJson['date_created'],
categories: dataCategories,
images: dataImages
);
}
Map<String, dynamic> toMap() {
var map = new Map<String, dynamic>();
ImagesModel img = ImagesModel();
Map<String, dynamic> imagesList = img.toMap();
map["id"] = id;
map["name"] = name;
map["description"] = description;
map["catalog_visibility"] = catalog_visibility;
map["short_description"] = short_description;
map["regular_price"] = regular_price;
map["sale_price"] = sale_price;
map["date_created"] = date_created;
map['images'] = imagesList;
return map;
}
}

Answer 1

Just check imagesList null or not. Like
Map<String, dynamic> toMap() {
var map = new Map<String, dynamic>();
ImagesModel img = ImagesModel();
Map<String, dynamic> imagesList = img.toMap();
map["id"] = id;
map["name"] = name;
map["description"] = description;
map["catalog_visibility"] = catalog_visibility;
map["short_description"] = short_description;
map["regular_price"] = regular_price;
map["sale_price"] = sale_price;
map["date_created"] = date_created;
if (this.images != null) {
data['images'] = this.images.map((v) => v.toJson()).toList();
}
return map;
}

Answer 2

The constuctor function has no parameters. Check this out.
ImagesModel img = ImagesModel(id:1,src:'value',name:'value');
.
Map<String, dynamic> toMap() {
var map = new Map<String, dynamic>();
ImagesModel img = ImagesModel(id:1,src:'value',name:'value');
Map<String, dynamic> imagesList = img.toMap();
map["id"] = id;
map["name"] = name;
map["description"] = description;
map["catalog_visibility"] = catalog_visibility;
map["short_description"] = short_description;
map["regular_price"] = regular_price;
map["sale_price"] = sale_price;
map["date_created"] = date_created;
map['images'] = imagesList; --> I got null value on this images
return map;
}