The Books Quote app needed some new features.
While using the app, the idea of hiding certain books from being displayed on the home page could prove to be helpful.
I made a few changes to implement this feature.
/// Method for fetching a random document in Firestore.
Future<BookModel> getRandom({required String uid}) async {
try {
// Create a random string to use as the index.
String randomString = 20.getRandomString();
// Create a base query for books that are not hidden.
Query<BookModel> query = (_booksDB
.where('uid', isEqualTo: uid)
.where('hidden', isEqualTo: false)
.orderBy('id')
.limit(1));
// Check for books with a greater index than random, (results maybe).
List<QueryDocumentSnapshot<BookModel>> firstRoundDocs =
(await query.where('id', isGreaterThanOrEqualTo: randomString).get())
.docs;
if (firstRoundDocs.isNotEmpty) {
return firstRoundDocs[0].data();
}
// Check for books with a greater index than the empty string, (results guaranteed).
List<QueryDocumentSnapshot<BookModel>> secondRoundDocs =
(await query.where('id', isGreaterThanOrEqualTo: '').get()).docs;
if (secondRoundDocs.isNotEmpty) {
return secondRoundDocs[0].data();
}
throw Exception('No random book found.');
} catch (e) {
throw Exception(e.toString());
}
}
/// If the book is hidden, display the 'Show' panel.
if (book.hidden) ...[ SlidableAction(
onPressed: showBook,
backgroundColor: colors [1],
foregroundColor: Colors.white,i
con: Icons.present_to_all,
label: 'Show',
),
],
// If the book is not hidden, display the 'Hide' panel.
if (!book.hidden) ...[ SlidableAction(
onPressed: hideBook,
backgroundColor: _colors [2],
foregroundColor: Colors.white,
icon: Icons.hide_image,
label: 'Hide',
)
]
/// Toggle hide eproprety.
Future hideBook({required BookModel book}) async {
try {
// Update 'hidden' property on the BE.
await _bookService.update(
uid: uid,
id: book.id!,
data: {'hidden': true},
);
// Update 'hidden' property on the FE.
books [books.indexOf(book)] = book.copyWith(hidden: true);
notifyListeners();
} catch (e) {
throw Exception(e);
}
