Question 79012 in Flutter Question posted in
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Toggling a favorites button while adding and deleting items from firestore – Flutter

I want to toggle a favourites button using firestore. When i click on it initially, I want to add it to a collection, then clicking again should remove that exact item from the collection. My issue here is that, I could achieve this by setting the doc name to the title and simply delete using the title has reference. This would have an issue later on, since two products can technically have the same name. That is why I want to use the id has a reference name since it is dynamic. This is the code below.

try {
              if (widget.product['isFavourited'] == true) {
                String docId = widget.product.id;
                // print(docId.toString());
                // print(widget.product['isFavourited'].toString());
                await FirebaseFirestore.instance
                    .collection('Products')
                    .doc(docId)
                    .update({'isFavourited': false}).then((value) async {
                  final CollectionReference collectionReference =
                      FirebaseFirestore.instance
                          .collection('Users')
                          .doc(uid)
                          .collection('Favourites');
                  await collectionReference
                      .doc()
                      .delete();
                  print('');
                });
              } else {
                String docId = widget.product.id;
                await FirebaseFirestore.instance
                    .collection('Products')
                    .doc(docId)
                    .update({'isFavourited': true}).then((value) async {
                  final CollectionReference collectionReference =
                      FirebaseFirestore.instance
                          .collection('Users')
                          .doc(uid)
                          .collection('Favourites');
                          final String id = collectionReference.doc().id;
                  final String itemtodelete = collectionReference.doc(id).id;
                  print(itemtodelete);
                  print(id);
                  await collectionReference.doc(itemtodelete).set({
                    'id': itemtodelete,
                    'title': widget.product['title'],
                    'price': widget.product['price'],
                    'about': widget.product['about'],
                    'description': widget.product['description'],
                    'imagepath': widget.product['imagepath'],
                    'isFavourited': widget.product['isFavourited'],
                    'isCarted': widget.product['isCarted'],
                  });
                });
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2

Answers


  1. Chosen as BEST ANSWER
    0

    This code worked perfectly for me, given the way I structured my function. @Adnan Khan's answer was really helpful in figuring it out. I hope this helps someone who is stuck.

    Future<String> addtoFavourites(QueryDocumentSnapshot data, String uid) async {
final CollectionReference collectionReference = FirebaseFirestore.instance
    .collection('Users')
    .doc(uid)
    .collection('Favourites');
final String id = collectionReference.doc().id;
String docId = data.id;
try {
  if (data['isFavourited'] == true) {
    await FirebaseFirestore.instance
        .collection('Products')
        .doc(docId)
        .update({'isFavourited': false}).then((value) async {
      print(docId);
      await collectionReference.doc(docId).delete();
      return 'Removed from favourites';
    });
  } else {
    await FirebaseFirestore.instance
        .collection('Products')
        .doc(docId)
        .update({'isFavourited': true}).then((value) async {
      print(docId);
      print(id);
      await collectionReference.doc(docId).set({
        'id': docId,
        'title': data['title'],
        'price': data['price'],
        'about': data['about'],
        'description': data['description'],
        'imagepath': data['imagepath'],
        'isFavourited': true,
        'isCarted': data['isCarted'],
      });
    });
  }
  notifyListeners();
  return 'Added to favourites';
} catch (e) {
  return e.toString();
}

  2. 0

    try is out hope this will help.

    // productId is your productId = widget.product.id
    // uid is your current user id
    // favorite id is your each favorite documentId

    Future<void> addToFavorite(String productId, String uid, favoriteId) async {

final productCollection = FirebaseFirestore.instance.collection("Products");
final favoriteCollection = FirebaseFirestore.instance.collection("Users").doc(uid).collection("Favorites");

final productDocReference = await productCollection.doc(productId).get();

if (productDocReference.exists) {
  
  final favoriteDocReference = favoriteCollection.doc(favoriteId).get().then((favoriteDoc) {

    if (!favoriteDoc.exists) {
      favoriteCollection.doc(favoriteId).set({
                'id': favoriteId,
                'title': widget.product['title'],
                'price': widget.product['price'],
                'about': widget.product['about'],
                'description': widget.product['description'],
                'imagepath': widget.product['imagepath'],
                'isFavourited': widget.product['isFavourited'],
                'isCarted': widget.product['isCarted'],}).then((value){
        productCollection.doc(productId).update({
          "isFavourited": true
        });
      });

    } else {
      favoriteCollection.doc(favoriteId).delete().then((value) {
        productCollection.doc(productId).update({
          "isFavourited": false
        });
      });
    }
  });
}

    }

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