how to migrate snapshot.data.data(); to null safety-CodePudding

this is the code can any help me how to change this to null safety, I am getting errors in .data(). i changed my project to null-safety, and then i am facing this issue

this is the error

The method 'data' can't be unconditionally invoked because the receiver can be 'null'. Try making the call conditional (using '?.') or adding a null check to the target ('!').

Map<String, dynamic>? documentData = snapshot.data.data();

class HomeSlider extends StatefulWidget {
  final String? doc_id;
  HomeSlider({this.doc_id});
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<HomeSlider> {
  FirebaseServices _firebaseServices = FirebaseServices();
  int activeIndex = 1;

  @override
  Widget build(BuildContext context) {
    super.build(context);
    return Container(
        // height: 200,
        child: FutureBuilder(
            future: _firebaseServices.sliderRef
                .doc(widget.doc_id == null ? "Slider" : widget.doc_id)
                .get(),
            builder: (context, snapshot) {
              if (snapshot.hasError) {
                return Center(
                  child: Text("Error: ${snapshot.error}"),
                );
              }

              if (snapshot.connectionState == ConnectionState.done) {

                     // the error is here in data()
                // Firebase Document Data Map
                Map<String, dynamic> documentData = snapshot.data.data();

                List? imageList = documentData['images'];
                List? suid = documentData['suid'];

                return SliderBody(
                  imageList: imageList,
                  suid: suid,
                );
              }
              return Center(
                child: CircularProgressIndicator(),
              );
            }));
  }}

CodePudding user response：

you should go with

Map<String, dynamic>? documentData = snapshot!.data.data();

CodePudding user response：

the problem was in builder: (context, snapshot) { after adding the AsyncSnapshot and finally like this. builder: (context, AsyncSnapshot snapshot) { and also add ! before .data()

class HomeSlider extends StatefulWidget {
  final String? doc_id;
  HomeSlider({this.doc_id});
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<HomeSlider> {
  FirebaseServices _firebaseServices = FirebaseServices();
  int activeIndex = 1;

  @override
  Widget build(BuildContext context) {
    super.build(context);
    return Container(
        // height: 200,
        child: FutureBuilder(
            future: _firebaseServices.sliderRef
                .doc(widget.doc_id == null ? "Slider" : widget.doc_id)
                .get(),
            builder: (context,AsyncSnapshot snapshot) {
              if (snapshot.hasError) {
                return Center(
                  child: Text("Error: ${snapshot.error}"),
                );
              }

              if (snapshot.connectionState == ConnectionState.done) {

                     // the error is here in data()
                // Firebase Document Data Map
                Map<String, dynamic> documentData = snapshot.data!.data();

                List? imageList = documentData['images'];
                List? suid = documentData['suid'];

                return SliderBody(
                  imageList: imageList,
                  suid: suid,
                );
              }
              return Center(
                child: CircularProgressIndicator(),
              );
            }));
  }}```


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