CODEWITHSUNDEEP
firebaseflutterdartgoogle-cloud-firestore
Rohan Choudhary
Rohan Choudhary

Reputation: 303

How to get fieldValue.arrayUnion data from firebase flutter

I have called for the data of fieldunion array

Future _getData(String email) async {
        await FirebaseFirestore.instance
            .collection("shop")
            .get()
            .then((querySnapshot) {
          querySnapshot.docs.forEach((result) {
            print(result.data()["products"]);
          });
        });
      }

This is the data I get which is the fieldunion array of products.

[{img: [https://firebasestorage.googleapis.com/v0/b/geniemart-387b1.appspot.com/o/seller%2Fproduct%2Frohanchoudhary2000%40gmail.com%2F20%2Fimage_1?alt=media&token=6b67a55d-01aa-4970-b518-719c30db7938, https://firebasestorage.googleapis.com/v0/b/geniemart-387b1.appspot.com/o/seller%2Fproduct%2Frohanchoudhary2000%40gmail.com%2F20%2Fimage_2?alt=media&token=483b46e0-9d8f-48ec-b431-d083341d4815, https://firebasestorage.googleapis.com/v0/b/geniemart-387b1.appspot.com/o/seller%2Fproduct%2Frohanchoudhary2000%40gmail.com%2F20%2Fimage_3?alt=media&token=fea76365-59cd-47d2-96a4-55a9387dfbf5, https://firebasestorage.googleapis.com/v0/b/geniemart-387b1.appspot.com/o/seller%2Fproduct%2Frohanchoudhary2000%40gmail.com%2F20%2Fimage_4?alt=media&token=a2136333-d099-4465-8121-2cf9f2e75d61], mprice: 123, freq: [], discount: 12, marketedBy: Manufacturer, long: 72.0, life: 5 years, manufacturer: Manufacturer, isveg: true, oprice: 123, name: tgbbb, id: 10000000, category: Tomato , brand: tgbbb, lat: 28.0, desc: gyyhhh}

Now, I want to specifically get the value of one of it's attribute which is category. How do do that? result.data()["products"][2]["category"] is not working.

[ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: RangeError (index): Invalid value: Not in inclusive range 0..1: 2

Upvotes: 0

Views: 359

Answers (1)

Abraham Obed
Abraham Obed

Reputation: 21

Be sure that the data return when you do result.data()["products"] is of type List if not use the jsonDecode method to convert it into a List In order to allows you get access to field of that List

Now after being sure for the above things

So if it a string do try this:

dynamic results=jsonDecode (result.data()["products"]); String category=results [0]["category"];

If it is already a List directly you can access your category field like that: result.data()["products"][0]["category"]

Upvotes: 2

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