Add List<Model> to List inside List<Model>-CodePudding

I have three models in my project, LibraryModel, LibraryContentsModel, and BooksModel.

LibraryModel: a model for local JSON file.

BooksModel: a model for SQLite database.

LibraryContentsModel: a model I created for search and filter into SQLite database.

LibraryModel:

class LibraryModel {
    final String? title;
    final String? fullTitle;
    final String? subject;
    final int? id;
    final int? count;
    final String? image;
    final String? dbName;
    final String? part;
    bool? isSelected;
  LibraryModel({
    this.title,
    this.fullTitle,
    this.subject,
    this.id,
    this.count,
    this.image,
    this.dbName,
    this.part,
    this.isSelected,
  });
}

BooksModel:

class BooksModel {
  final int? id;
  final String? pageTitle;
  final String? pageText;
  final String? footTitle;
  BooksModel({
    this.id,
    this.pageTitle,
    this.pageText,
    this.footTitle,
  });
}

LibraryContentsModel:

class LibraryContentsModel {
  int? id;
  String? title;
  String? part;
  String? dbName;
  List<BooksModel>? booksList;
  LibraryContentsModel({
    this.id,
    this.title,
    this.part,
    this.dbName,
    this.booksList,
  });
}

Problem:

I need to insert data from SQLite Database into the booksList parameter in LibraryContetnsModel which is already defined named of table SQLite in LibraryModel, each table contains data in order.

Fetch Code:

Future loadLibrary() async {
  setState(() => isLoad = true);
  try {
    libraryList.addAll(await LibraryService.instance.getLibrary());
    for (var item in libraryList) {
      booksList
          .addAll(await DatabaseService.instance.getBooks(item.dbName ?? ""));
      libraryContentsList.add(
        LibraryContentsModel(
          id: item.id,
          title: item.title,
          part: item.part,
          dbName: item.dbName,
          // booksList: [booksList].expand((element) => element).toList(), <-- When I run this line get me exception
        ),
      );
    }
  } catch (e) {
    print(e.toString());
  }
  setState(() => isLoad = false);
}

Edit

I need Like this example:

LibraryModel:
  id: 1
  title: "Clean Code"
  part: "2nd Edition"
  dbName: "clean_code"
...

BooksModel:
  id: 115
  pageTitle: "Test Automation Pyramid"
  pageText: "Professional developers employ the discipline of Test Driven Development...."
  footTitle: "[COHN09] pp.311-312"

LibraryContentsModel:
  id: LibraryModel.id = 1
  title: LibraryModel.title = "Clean Code"
  part: LibraryModel.part = "2nd Edition"
  dbName: LibraryModel.dbName = "clean_code"
  booksList: BooksModel(
  id: 115
  pageTitle: "Test Automation Pyramid"
  pageText: "Professional developers employ the discipline of Test Driven Development...."
  footTitle: "[COHN09] pp.311-312"
)

How can I do that?

CodePudding user response：

Why don't use just

LibraryContentsModel(
  ...
  bookList: booklist, // already fetched
),