flutter_firestore_tut

.\lib\scr\home.dart

//...
class _Home extends State<StatefulWidget> {
  //...
  void clickGet() async {
    if (_getContr.text.isNotEmpty) {
      var query = await Firestore.instance
          .collection('docs')
          .where('text', isEqualTo: _getContr.text)
          .getDocuments();
      setState(() {
        _queriedDocs = query.documents.length;
      });
      interact();
    }
  }
  //...  
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      //...
    );
  }
}