How can I check if a Documentsnapshot has data? - firebase

Question

Im trying to figuring out if videos exists inside a collection or not and if they exist I wanna show them and showing them works actually but if not then I wanna print a default text like No videos yet but I dont know how I can do this . Maybe anyone can help.
Heres my code in the Inkwell I displaying all videos
FutureBuilder(
future: myVideos,
builder: (BuildContext context, snapshot) {
if (!snapshot.hasData) {
return Container();
}
return StaggeredGridView.countBuilder(
scrollDirection: Axis.vertical,
shrinkWrap: true,
physics: ScrollPhysics(),
crossAxisCount: 3,
itemCount: snapshot.data.docs.length,
itemBuilder: (context, index) {
DocumentSnapshot video =
snapshot.data.docs[index];
return InkWell(
onTap: (){
Navigator.of(context).pushNamed(
ChatFirstpage.route);
},child: Card(
elevation: 0.0,
child: ClipRRect(
borderRadius: BorderRadius.circular(25),
clipBehavior: Clip.antiAliasWithSaveLayer,
child: Image.network(
video.data()['previewimage'],
fit: BoxFit.cover,
),
),
//imageData: searchImages[index],
),
);
},
staggeredTileBuilder: (index) =>
StaggeredTile.count((index % 7 == 0) ? 2 : 1,
(index % 7 == 0) ? 2 : 1),
mainAxisSpacing: 8.0,
crossAxisSpacing: 4.0,
);
},
),
And heres my Videos collection
Future myVideos;
int likes = 0;
bool dataisthere = false;
#override
void initState() {
super.initState();
getalldata();
}
getalldata() async {
//get videos as future
myVideos = FirebaseFirestore.instance
.collection('videos')
.where('uid', isEqualTo: widget.userid)
.get();
var documents = await FirebaseFirestore.instance
.collection('videos')
.where('uid', isEqualTo: widget.userid)
.get();
for (var item in documents.docs) {
likes = item.data()['likes'].length + likes;
}
setState(() {
dataisthere = true;
});
}

Answer 1

You can do a check before navigating to the movie's page. Something like:
// ... other lines
itemCount: snapshot.data.docs.length,
itemBuilder: (context, index) {
DocumentSnapshot video = snapshot.data.docs[index];
return InkWell(
onTap: () {
// Do your check here, if video not exist display a SnackBar
if (video.data()['video_url'] == null) {
Scaffold.of(context).showSnackBar(SnackBar(
content: Text('Video not exist'),
duration: Duration(seconds: 2),
backgroundColor: Colors.orange,
));
} else {
// If video exist, navigate to the page
Navigator.of(context).pushNamed(ChatFirstpage.route);
}
},
child: Card(
elevation: 0.0,
child: ClipRRect(
// ... other lines

Answer 2

Try this:
DocumentSnapshot video = snapshot.data.docs[index];
if (video.data()['previewimage'] == null) {return Text('no video');}