alexa

Is there a way to avoid a Firestore field from reaching a negative value in android ?

Is there a way to avoid a Firestore field from reaching a negative value in android ?

I could solve it! And if you have the same problem, here's how. I went the way round and used a transaction instead of FieldValue.update()

Basically, I did the following:

 void update() async {
    await FirebaseFirestore.instance.runTransaction((transaction) async {
      final snapshot = await transaction.get(docRef);
      final amount = snapshot.get("example");
      if (amount > 0) {
        final newAmount = snapshot.get("example") - 1;
        transaction.update(docRef, {"example": newAmount});
      }
    });
  }

233 0
7

Write a Comments


* Be the first to Make Comment

GoodFirms Badge
GoodFirms Badge

Fix Your Meeting With Our SEO Consultants in India To Grow Your Business Online

Facebook
Twitter
LinkedIn
Instagram
Whatsapp
Call Now
Quick Inquiry