如何使用Cloud Firestore从抖动中的数据快照中获取特定值？

Question

Data from the snapshot isn't storing in the variables (_gender, _email, verify).

    Firestore.instance.collection('Matrimonial').where('email', isEqualTo: _userEmail)
      .snapshots().listen(
            (data) {
              setState(() {
                this._gender = data.documents[0]['gender'];
                this._verify = data.documents[0]['verify'];
              });
            } 
      );

Maybe the query isn't correct, please help ?

Answer 1

I think you forgot to add ".data" after the array of snapshots, try this.

Firestore.instance.collection('Matrimonial').where('email', isEqualTo: _userEmail)
      .snapshots().listen(
            (data) {
              setState(() {
                this._gender = data.documents[0].data['gender'];
                this._verify = data.documents[0].data['verify'];
              });
            } 
      );