Favoriting Items in Flutter Using Sqlite - sqlite

Question

I want to be able to favorite/mark items in a already populated local sqlite database to display on a "favorites page" that shows a list of favorited items.
In this sqlite database, I have a table of genres and a table of books relating to a specific genre. I am not using a model "book" class to display book information in a list. I have using a rawQuery to place a ROW of book information into a List to display that book information in a bookView page. Like so..
Future getDescriptionData() async {
Directory documentsDirectory = await getApplicationDocumentsDirectory();
String path = join(documentsDirectory.path, "asset_sample_sqlite.db");
ByteData data =
await rootBundle.load(join("assets", "sample_sqlite.db"));
List<int> bytes =
data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);
await new File(path).writeAsBytes(bytes);
Database db = await openDatabase(path);
await db
.rawQuery('SELECT * FROM books WHERE id = "${widget.id}"') // id passed on from previous page where it shows a list of books
.then((results) {
setState(() {
loading = false;
initialized = true;
bookDescription = results;
});
then I display the information like so..
body: Padding(
padding: const EdgeInsets.all(8.0),
child: new Center(
child: !loading
? new ListView.builder(
itemCount: bookDescription.length,
itemBuilder: (BuildContext context, int index) {
return new Card(
elevation: 2.0,
child: new ListTile(
title: new Text(${bookDescription[index]['title']}",
textAlign: TextAlign.center,
),
subtitle: new Text(
"${bookDescription[index]['summary']}",
),
),
),
),
);
},
)
What is the best method to include an iconButton in this card, and then have an option to favorite this "book" to add it to a shortlist of books that are favorited in a different favorite book list page?

Answer 1

You could create a Favorites table that only holds id values of the books table that have been favored. You should read that table also in getDescriptionData (or a similar getFavoriteData method) so that you have a list of favored book ids in memory, available when the build function is called. In the Card add a leading argument with an Icon representing a filled or unfilled star (depending on whether the bookDescription[index]['id'] is in the favored list) and wrap it in a GestureDetector where in its onTap you add or remove the book id from the list in memory and in your SQL table, then call setState to rebuild the list with the new favorite information.