Issue
i am trying to get from the table Products, the specific products that the P_ID is added to cart
now the code beneath work well but only retrieve one element
final Stream<QuerySnapshot> cart = FirebaseFirestore.instance
.collection('products')
.where('pid', isEqualTo: cartitems[0])
.snapshots();
however it doesn’t work when I do it like this
Stream<QuerySnapshot>? cart;
for (var i = 0; i < cartitems.length; i++) {
cart = FirebaseFirestore.instance
.collection('products')
.where('pid', isEqualTo: cartitems[i])
.snapshots();
}
it gives me this error
The following StateError was thrown building StreamBuilder<QuerySnapshot<Object?>>(dirty, state: _StreamBuilderBaseState<QuerySnapshot<Object?>, AsyncSnapshot<QuerySnapshot<Object?>>>#9ea5d):
Bad state: Snapshot has neither data nor error
The relevant error-causing widget was:
StreamBuilder<QuerySnapshot<Object?>> StreamBuilder
Solution
You can try using a Stream Builder instead to achieve the same effect without a for loop. Stream Builder will automatically take out all of the cart items you have stored in firebase. To get rid of the snapshot error, implement the if statements below.
final CollectionReference cart = FirebaseFirestore.instance.collection('products');
child: StreamBuilder(
stream: cart
.where('pid', isEqualTo: cartitems)
.snapshots();
builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
if (!snapshot.hasData) {
return const Text('Loading...');
}
if (snapshot.hasError) {
return const Text('Something went wrong.');
}
Answered By – adamcapjones
This Answer collected from stackoverflow, is licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0
Question:
I’m adding data from Firestore to a Stream from StreamBuilder, but I’m getting the following error:
Exception has occurred. StateError (Bad state: Snapshot has neither data nor error
My code.
class Home extends StatefulWidget {
const Home({Key? key}) : super(key: key);
@override
_HomeState createState() => _HomeState();
}
class _HomeState extends State<Home> {
AppState? estado;
static String? userID = FirebaseAuth.instance.currentUser?.uid;
static final userColeccion = FirebaseFirestore.instance.collection("users");
var groupfav = ' ';
Stream<QuerySnapshot>? taskGroup;
@override
void initState() {
super.initState();
getGroupFavData();
}
void getGroupFavData() async {
var groupFavData = await userColeccion.doc("$userID").get();
var groupfav = groupFavData.data()!['groupfav'];
taskGroup = FirebaseFirestore.instance
.collection("groups")
.doc(groupfav) // pass the obtained value
.collection("task")
.snapshots();
}
@override
Widget build(BuildContext context) {
estado = Provider.of<AppState>(context, listen: true);
return Scaffold(
appBar: AppBar(
title: const Text("Home"),
automaticallyImplyLeading: false,
),
body: StreamBuilder(
stream: taskGroup,
builder: (
BuildContext context,
AsyncSnapshot<QuerySnapshot> snapshot,
) {
if (snapshot.hasError) {
return const Text("error");
}
if (snapshot.connectionState == ConnectionState.waiting) {
return const Text("Loading");
}
var data = snapshot.requireData;
return ListView.builder(
itemCount: data.size,
itemBuilder: (context, index) {
return Card(
child: ListTile(
title: Text("${data.docs[index]['titulo']}"),
subtitle: Text("${data.docs[index]['contenido']}"),
onTap: () {},
trailing: IconButton(
icon: const Icon(Icons.delete),
color: Colors.red[200],
onPressed: () {},
),
),
);
},
);
},
),
);
}
}
Answer:
Ok, looking at your issue, I see that 1) you need to get the data of the document BEFORE you start listening on that document, which is normal, so you want to do a call first to the collection, get the document, then listen on the document’s collection called task, which makes sense. Your issue is still an asynchronous issue. The app is rebuilding on a stream that still hasn’t arrived; you have to fix the sequence of things.
You then need to switch things up a bit and do the following:
Option #1:
a) Use a FutureBuilder: this will allow you to make the async call to get the document name based on the user Id
b) After you get the document associated to that user, you want to listen on the stream produced by the collection called tasks in that document. There is where then you can hook up the StreamBuilder.
Option #2:
a) Keep things the way you have, but do a listen on the taskGroup snapshots; but keep rebuilding the list as the values arrive on that collection.
Those are my suggestions.
Here’s some brief code on option 1:
// .. in your Scaffold's body:
Scaffold(
body: FutureBuilder( // the future builder fetches the initial data
future: userColeccion.doc("$userID").get(),
builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
if (snapshot.hasData) {
var groupfav = snapshot.data()!['groupfav'];
// then once the 'groupfav' has arrived,
// start listening on the taskGroup
taskGroup = FirebaseFirestore.instance
.collection("groups")
.doc(groupfav) // pass the obtained value
.collection("task")
.snapshots();
return StreamBuilder(
stream: taskGroup,
builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
// the rest of your code
});
}
return CircularProgressIndicator();
}
)
)
Option 2 would be something like:
List<Task> userTasks = [];
void getGroupFavData() async {
var groupFavData = await userColeccion.doc("$userID").get();
var groupfav = groupFavData.data()!['groupfav'];
taskGroup = FirebaseFirestore.instance
.collection("groups")
.doc(groupfav) // pass the obtained value
.collection("task")
.snapshots().listen((snapshot) {
// here populate a list of your tasks
// and trigger a widget rebuild once you've grabbed the values
// and display it as a list on the UI
setState(() {
userTasks = snapshot.docs.map((d) => Task.fromJson(d.data())).toList();
});
});
}
And in your Scaffold, you can have a ListView just rendering the items on that task list, like:
ListView.builder(
itemCount: userTasks.length,
itemBuilder: (context, index) {
// render your tasks here
})
Here’s a Gist with some working code to illustrate my point. Run it on DartPad and you’ll see how using a FutureBuilder wrapping a StreamBuilder will accomplish what you want.
If you run the above code on DartPad, you’ll get the following output:
Hope those pointers take you somewhere.
If you have better answer, please add a comment about this, thank you!
Hi,
Every time I load the picker I receive the following error:
> I/flutter (19377): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
> I/flutter (19377): The following StateError was thrown building FutureBuilder<Uint8List>(dirty, state:
> I/flutter (19377): _FutureBuilderState<Uint8List>#8dd85):
> I/flutter (19377): Bad state: Snapshot has neither data nor error
> I/flutter (19377):
> I/flutter (19377): User-created ancestor of the error-causing widget was:
> I/flutter (19377): ImageItem
> I/flutter (19377): file:///Users/leonardorignanese/Progetti/Flutter/MyGrandKids/my_grand_kids/photo-0.3.4+1_custom/lib/src/ui/page/photo_main_page.dart:300:13
> I/flutter (19377):
> I/flutter (19377): When the exception was thrown, this was the stack:
> I/flutter (19377): #0 AsyncSnapshot.data (package:flutter/src/widgets/async.dart:263:5)
> I/flutter (19377): #1 ImageItem.build.<anonymous closure> (package:photo/src/ui/page/main/image_item.dart:33:35)
> I/flutter (19377): #2 _FutureBuilderState.build (package:flutter/src/widgets/async.dart)
> I/flutter (19377): #3 StatefulElement.build (package:flutter/src/widgets/framework.dart:4039:27)
> I/flutter (19377): #4 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3933:15)
> I/flutter (19377): #5 Element.rebuild (package:flutter/src/widgets/framework.dart:3730:5)
> I/flutter (19377): #6 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3916:5)
> I/flutter (19377): #7 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4080:11)
> I/flutter (19377): #8 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3911:5)
> I/flutter (19377): #9 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3093:14)
> I/flutter (19377): #10 Element.updateChild (package:flutter/src/widgets/framework.dart:2896:12)
> I/flutter (19377): #11 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3953:16)
> I/flutter (19377): #12 Element.rebuild (package:flutter/src/widgets/framework.dart:3730:5)
> I/flutter (19377): #13 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3916:5)
> I/flutter (19377): #14 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3911:5)
> I/flutter (19377): #15 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3093:14)
> I/flutter (19377): #16 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5225:32)
> I/flutter (19377): #17 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3093:14)
> I/flutter (19377): #18 Element.updateChild (package:flutter/src/widgets/framework.dart:2896:12)
> I/flutter (19377): #19 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5119:14)
> I/flutter (19377): #20 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3093:14)
> I/flutter (19377): #21 Element.updateChild (package:flutter/src/widgets/framework.dart:2896:12)
> I/flutter (19377): #22 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5119:14)
> I/flutter (19377): #23 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3093:14)
> I/flutter (19377): #24 Element.updateChild (package:flutter/src/widgets/framework.dart:2896:12)
> I/flutter (19377): #25 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3953:16)
> I/flutter (19377): #26 Element.rebuild (package:flutter/src/widgets/framework.dart:3730:5)
> I/flutter (19377): #27 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3916:5)
> I/flutter (19377): #28 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4080:11)
> I/flutter (19377): #29 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3911:5)
> I/flutter (19377): #30 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3093:14)
> I/flutter (19377): #31 Element.updateChild (package:flutter/src/widgets/framework.dart:2896:12)
> I/flutter (19377): #32 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3953:16)
> I/flutter (19377): #33 Element.rebuild (package:flutter/src/widgets/framework.dart:3730:5)
> I/flutter (19377): #34 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3916:5)
> I/flutter (19377): #35 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3911:5)
> I/flutter (19377): #36 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3093:14)
> I/flutter (19377): #37 Element.updateChild (package:flutter/src/widgets/framework.dart:2896:12)
> I/flutter (19377): #38 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5119:14)
> I/flutter (19377): #39 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3093:14)
> I/flutter (19377): #40 Element.updateChild (package:flutter/src/widgets/framework.dart:2896:12)
> I/flutter (19377): #41 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5119:14)
> I/flutter (19377): #42 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3093:14)
> I/flutter (19377): #43 Element.updateChild (package:flutter/src/widgets/framework.dart:2896:12)
> I/flutter (19377): #44 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5119:14)
> I/flutter (19377): #45 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3093:14)
> I/flutter (19377): #46 Element.updateChild (package:flutter/src/widgets/framework.dart:2896:12)
> I/flutter (19377): #47 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3953:16)
> I/flutter (19377): #48 Element.rebuild (package:flutter/src/widgets/framework.dart:3730:5)
> I/flutter (19377): #49 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3916:5)
> I/flutter (19377): #50 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3911:5)
> I/flutter (19377): #51 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3093:14)
> I/flutter (19377): #52 Element.updateChild (package:flutter/src/widgets/framework.dart:2896:12)
> I/flutter (19377): #53 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3953:16)
> I/flutter (19377): #54 Element.rebuild (package:flutter/src/widgets/framework.dart:3730:5)
> I/flutter (19377): #55 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3916:5)
> I/flutter (19377): #56 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3911:5)
> I/flutter (19377): #57 ParentDataElement.mount (package:flutter/src/widgets/framework.dart:4306:11)
> I/flutter (19377): #58 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3093:14)
> I/flutter (19377): #59 Element.updateChild (package:flutter/src/widgets/framework.dart:2896:12)
> I/flutter (19377): #60 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3953:16)
> I/flutter (19377): #61 Element.rebuild (package:flutter/src/widgets/framework.dart:3730:5)
> I/flutter (19377): #62 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3916:5)
> I/flutter (19377): #63 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4080:11)
> I/flutter (19377): #64 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3911:5)
> I/flutter (19377): #65 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3093:14)
> I/flutter (19377): #66 Element.updateChild (package:flutter/src/widgets/framework.dart:2896:12)
> I/flutter (19377): #67 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3953:16)
> I/flutter (19377): #68 Element.rebuild (package:flutter/src/widgets/framework.dart:3730:5)
> I/flutter (19377): #69 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3916:5)
> I/flutter (19377): #70 ComponentElement.mount (package:flutter/src/widgets/framework.dart:3911:5)
> I/flutter (19377): #71 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3093:14)
> I/flutter (19377): #72 Element.updateChild (package:flutter/src/widgets/framework.dart:2896:12)
> I/flutter (19377): #73 SliverMultiBoxAdaptorElement.updateChild (package:flutter/src/widgets/sliver.dart:1181:36)
> I/flutter (19377): #74 SliverMultiBoxAdaptorElement.createChild.<anonymous closure> (package:flutter/src/widgets/sliver.dart:1166:20)
> I/flutter (19377): #75 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2320:19)
> I/flutter (19377): #76 SliverMultiBoxAdaptorElement.createChild (package:flutter/src/widgets/sliver.dart:1159:11)
> I/flutter (19377): #77 RenderSliverMultiBoxAdaptor._createOrObtainChild.<anonymous closure> (package:flutter/src/rendering/sliver_multi_box_adaptor.dart:354:23)
> I/flutter (19377): #78 RenderObject.invokeLayoutCallback.<anonymous closure> (package:flutter/src/rendering/object.dart:1735:58)
> I/flutter (19377): #79 PipelineOwner._enableMutationsToDirtySubtrees (package:flutter/src/rendering/object.dart:814:15)
> I/flutter (19377): #80 RenderObject.invokeLayoutCallback (package:flutter/src/rendering/object.dart:1735:13)
> I/flutter (19377): #81 RenderSliverMultiBoxAdaptor._createOrObtainChild (package:flutter/src/rendering/sliver_multi_box_adaptor.dart:343:5)
> I/flutter (19377): #82 RenderSliverMultiBoxAdaptor.addInitialChild (package:flutter/src/rendering/sliver_multi_box_adaptor.dart:427:5)
> I/flutter (19377): #83 RenderSliverGrid.performLayout (package:flutter/src/rendering/sliver_grid.dart:543:12)
> I/flutter (19377): #84 RenderObject.layout (package:flutter/src/rendering/object.dart:1639:7)
> I/flutter (19377): #85 RenderSliverPadding.performLayout (package:flutter/src/rendering/sliver_padding.dart:181:11)
> I/flutter (19377): #86 RenderObject.layout (package:flutter/src/rendering/object.dart:1639:7)
> I/flutter (19377): #87 RenderViewportBase.layoutChildSequence (package:flutter/src/rendering/viewport.dart:406:13)
> I/flutter (19377): #88 RenderViewport._attemptLayout (package:flutter/src/rendering/viewport.dart:1334:12)
> I/flutter (19377): #89 RenderViewport.performLayout (package:flutter/src/rendering/viewport.dart:1252:20)
> I/flutter (19377): #90 RenderObject.layout (package:flutter/src/rendering/object.dart:1639:7)
> I/flutter (19377): #91 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
> I/flutter (19377): #92 RenderObject.layout (package:flutter/src/rendering/object.dart:1639:7)
> I/flutter (19377): #93 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
> I/flutter (19377): #94 RenderObject.layout (package:flutter/src/rendering/object.dart:1639:7)
> I/flutter (19377): #95 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
> I/flutter (19377): #96 RenderObject.layout (package:flutter/src/rendering/object.dart:1639:7)
> I/flutter (19377): #97 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
> I/flutter (19377): #98 RenderObject.layout (package:flutter/src/rendering/object.dart:1639:7)
> I/flutter (19377): #99 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
> I/flutter (19377): #100 RenderObject.layout (package:flutter/src/rendering/object.dart:1639:7)
> I/flutter (19377): #101 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
> I/flutter (19377): #102 RenderObject.layout (package:flutter/src/rendering/object.dart:1639:7)
> I/flutter (19377): #103 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
> I/flutter (19377): #104 RenderObject.layout (package:flutter/src/rendering/object.dart:1639:7)
> I/flutter (19377): #105 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
> I/flutter (19377): #106 RenderObject.layout (package:flutter/src/rendering/object.dart:1639:7)
> I/flutter (19377): #107 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
> I/flutter (19377): #108 RenderObject.layout (package:flutter/src/rendering/object.dart:1639:7)
> I/flutter (19377): #109 _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:105:13)
> I/flutter (19377): #110 RenderObject.layout (package:flutter/src/rendering/object.dart:1639:7)
> I/flutter (19377): #111 MultiChildLayoutDelegate.layoutChild (package:flutter/src/rendering/custom_layout.dart:142:11)
> I/flutter (19377): #112 _ScaffoldLayout.performLayout (package:flutter/src/material/scaffold.dart:443:7)
> I/flutter (19377): #113 MultiChildLayoutDelegate._callPerformLayout (package:flutter/src/rendering/custom_layout.dart:212:7)
> I/flutter (19377): #114 RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:356:14)
> I/flutter (19377): #115 RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:1516:7)
> I/flutter (19377): #116 PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:783:18)
> I/flutter (19377): #117 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:346:19)
> I/flutter (19377): #118 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:702:13)
> I/flutter (19377): #119 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:285:5)
> I/flutter (19377): #120 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1033:15)
> I/flutter (19377): #121 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:975:9)
> I/flutter (19377): #122 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:891:5)
> W/ExifInterface(19377): Skip the tag entry since tag number is not defined: 2
> I/flutter (19377): #126 _invoke (dart:ui/hooks.dart:236:10)
> I/flutter (19377): #127 _drawFrame (dart:ui/hooks.dart:194:3)
> I/flutter (19377): (elided 3 frames from package dart:async)
> I/flutter (19377):
> I/flutter (19377): ════════════════════════════════════════════════════════════════════════════════════════════════════
I’ve fully imported your library inside my project (copying all the files) because I needed to make some customizations in the UI. I don’t think this error is related to my small modifications (just added a translation and a button in the bottombar).
It just in the log and I don’t see any big malfunction apart the fact that if I scroll down fast, the pictures before are red showing an error, but then quickly refresh to show the picture:
What does this error come from? I can’t really understand it. I checked if the data is null or empty before execute it but I get the anyway so I suppose it is caused by another error inside data.
Thanks
i am trying to get the product ID’s from Cart table, then getting the products from Products table from those ID’s
and its shows me this Error
Bad state: Snapshot has neither data nor error
and this error occured after making «cart» local variable here
Stream<QuerySnapshot>? cart;
=========
class _CartScreenState extends State<CartScreen> {
final databseRefrence = FirebaseDatabase.instance.reference();
String? Id;
final cartitems = [];
Stream<QuerySnapshot>? cart;
void initState() {
getProductsFromCart();
super.initState();
}
and the main idea is here
getProductsFromCart() async {
try {
var collectionRef = await databseRefrence.child("Cart").get();
Map<dynamic, dynamic> values = collectionRef.value;
values.forEach((key, values) {
if (values['userId'] == Id) {
// cartitems.add(values['productId']);
cart = FirebaseFirestore.instance
.collection('products')
.where('pid', isEqualTo: values['productId'])
.snapshots();
}
});
} catch (e) {
throw e;
}
}
=============
String SubString(String? s) {
if (s!.length > 40) {
return s.substring(0, 40);
} else {
return s;
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: BMainColor,
elevation: 0,
title: Text('Cart'),
automaticallyImplyLeading: false,
),
body: SingleChildScrollView(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Container(
height: 800,
child: StreamBuilder<QuerySnapshot>(
stream: cart,
builder: (BuildContext context,
AsyncSnapshot<QuerySnapshot> snapshot) {
if (snapshot.hasError) {
return Text('something went wrong');
}
if (snapshot.connectionState == ConnectionState.waiting) {
return Center(
child: Text('Loading..',
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 32,
fontWeight: FontWeight.bold,
)),
);
}
final data = snapshot.requireData;
return ListView.builder(
itemCount: data.size,
itemBuilder: (context, index) {
return GestureDetector(
onTap: () {},
child: Card(
child: Row(children: [
Padding(
padding: const EdgeInsets.all(8.0),
child: Image.network(data.docs[index]['image'],
width:
MediaQuery.of(context).size.width * 0.3,
height: MediaQuery.of(context).size.height *
0.15,
fit: BoxFit.cover),
),
Padding(
padding: const EdgeInsets.all(8.0),
child: Container(
width:
MediaQuery.of(context).size.width * 0.57,
child: Column(
crossAxisAlignment:
CrossAxisAlignment.start,
children: [
Text(
data.docs[index]['name'],
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 20),
),
SizedBox(
height: 10,
),
Container(
child: Text(
SubString(data.docs[index]
['description']) +
"...",
),
),
SizedBox(
height: 5,
),
Text(
data.docs[index]['price'] + " AED",
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 16),
),
],
),
),
),
]),
),
);
},
);
}),
),
],
),
),
);
}
}
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