How to get data from nested object from firebase?

Question

So I'm currently following course flutter and here I'm trying to get some data from the nested object from firebase

this one call when fetching data

 final favoriteResponse = await http.get(url);
      final favoriteData = json.decode(favoriteResponse.body);
      final List<Product> loadedProducts = [];
      extractedData.forEach((prodId, prodData) {
        loadedProducts.add(Product(
          id: prodId,
          title: prodData['title'],
          description: prodData['description'],
          price: prodData['price'],
          isFavorite: favoriteData == null
              ? false
              : favoriteData[prodId]['isFavorite'] ?? false,
          imageUrl: prodData['imageUrl'],
        ));
        print(favoriteData[prodId]);
      });
      _items = loadedProducts;
      notifyListeners();

as you can see on the is favorite I want to get it from favoritedata[prodId]['isFavorite], why I'm using it like that because if I print favoritedata[prodId] the result is {'isFavorite':true} so I call like this favoritedata[prodId]['isFavorite] that get of boolean data, but its give me an error like this:

/flutter (15722): Receiver: null
I/flutter (15722): Tried calling: []("isFavorite")

also, this one is for updating the value to the database

try {
      final response = await http.put(
        url,
        body: json.encode(
          {
            'isFavorite': isFavorite,
          },
        ),
      );

      if (response.statusCode >= 400) {
        _setFavValue(oldStatus);
      }
    } catch (error) {
      _setFavValue(oldStatus);
    }

eamirho3ein · Accepted Answer · 2022-09-10 05:06:30Z

1

You just checking for favoriteData to not be null, but also favoriteData[prodId] could be null, so you need check that too. Change this

isFavorite: favoriteData == null
              ? false
              : favoriteData[prodId]['isFavorite'] ?? false,

to this:

isFavorite: favoriteData == null || favoriteData[prodId] == null
              ? false
              : favoriteData[prodId]['isFavorite'] ?? false,

edited Sep 10, 2022 at 5:06

answered Sep 9, 2022 at 12:33

eamirho3ein

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1 Comment

YouCanCallMe Syarif Over a year ago

This work but, I'm curious about what happened here could you please explain?

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