I have a Provider which has a method which takes data from Firebase as a stream, transforms it to a list and returns a Stream<List<Model>> . I'm trying to write a test where I want to check if the items in the List are the same as I expect them to be. How can I do that?
My Current Code:
test('getContacts returns a empty list when there is no contact',() async{
when(sharedPreferencesMock.get(any)).thenReturn('uid'); //mock the sharedprefs
documentSnapshot = DocumentSnapshotMock(); //mock documentsnapshot
when(documentSnapshot.exists).thenReturn(true); // this is done to pass the getUidByUsername method
documentReference = DocumentReferenceMock(documentSnapshotMock: documentSnapshot);
documentReference.setData({
'uid':'uid',
'contacts':[] // setting the usename in the data already so that duplicate contact exception is thrown
});
userDataProvider.getContacts().asBroadcastStream().listen((data){
expect(data.length,0);
});
});
And the provider method
#override
Stream<List<Contact>> getContacts() {
CollectionReference userRef = fireStoreDb.collection(Paths.usersPath);
DocumentReference ref =
userRef.document(SharedObjects.prefs.get(Constants.sessionUid));
return ref.snapshots().transform(StreamTransformer<DocumentSnapshot, List<Contact>>.fromHandlers(handleData: (documentSnapshot, sink) async{
List<String> contacts;
if (documentSnapshot.data['contacts'] == null) {
ref.updateData({'contacts': []});
contacts = List();
} else {
contacts = List.from(documentSnapshot.data['contacts']);
}
List<Contact> contactList = List();
for (String username in contacts) {
print(username);
String uid = await getUidByUsername(username);
DocumentSnapshot contactSnapshot = await userRef.document(uid).get();
contactList.add(Contact.fromFirestore(contactSnapshot));
}
sink.add(contactList);
}));
}
Update:
StreamController streamController = StreamController<List<Contact>>();
StreamSink<List<Contact>> sink = streamController.sink;
Stream<List<Contact>> stream = streamController.stream;
stream.listen((List<Contact> list){
expect(list.length,1);
});
userDataProvider.mapDocumentToContact(userCollection, userRef, documentSnapshot, sink);
streamController.close();
Make the lambda function that you currently pass to the StreamTansformer a separate function and test that.
If you want to test the full function there is a Firebase mock package on pub.
Related
My Task is :
I have an list of orders in firebase in users collection ,
I want to get information of those orders which is in orders collection,
And moment a list of order is updated in the firebase users collection.
The orders list should be automatically updated to get the latest information from the orders collection.
But for that i have to wait until list of orders is fetched from the users collection and only then i can query from orders collection about those orders..
I am stuck here,
And i want to actually understand Getx's bindStream , ever(), and observable variables,and Obx() is used in widget , But what if it is normal variable and i want to listen to it's changes ,how to do that, because Obx() can be only used while you use Widget
So far my code:
controllers.dart
UtilityController utilityController = UtilityController.instance;
CartController cartController = CartController.instance;
OrderController orderController = OrderController.instance;
UserModel.dart
class UserModel {
String? uid;
String? email;
String? name;
bool? isAdmin;
String? password;
List<CartItemModel>? cart;
String? token;
List<String>? orders;
UserModel({this.uid, this.email, this.name, this.isAdmin, this.password, this.cart, this.token, this.orders});
UserModel.fromSnapshot(DocumentSnapshot snapshot) {
uid = snapshot.id;
name = snapshot['name'];
token = snapshot['token'];
cart = _convertCartItems(snapshot['cart'] ?? []);
orders = new List<String>.from(snapshot['orders']);
}
List<CartItemModel> _convertCartItems(List cartFomDb) {
List<CartItemModel> _result = [];
if (cartFomDb.length > 0) {
cartFomDb.forEach((element) {
_result.add(CartItemModel.fromMap(element));
});
}
return _result;
}
}
UtilityController.dart
class UtilityController extends GetxController {
static UtilityController instance = Get.find();
Rx<UserModel> userModel = UserModel().obs;
#override
void onReady() {
super.onReady();
getUserType();
userModel.bindStream(listenToUser());
}
Stream<UserModel> listenToUser() {
return FirebaseFirestore.instance
.collection("users")
.doc(FirebaseAuth.instance.currentUser?.uid)
.snapshots()
.map((snapshot) => UserModel.fromSnapshot(snapshot));
}
OrderController.dart
class OrderController extends GetxController {
static OrderController instance = Get.find();
RxList<OrderModel> orders = RxList<OrderModel>([]);
#override
void onReady() {
super.onReady();
orders.bindStream(getAllOrders());
ever(utilityController.userModel, function); --> I am using this , but i know this is not the correct way
}
function(UserModel userModel) {
getAllOrders();
}
Stream<List<OrderModel>> getAllOrders() {
return FirebaseFirestore.instance
.collection("orders")
.where(FieldPath.documentId, whereIn: utilityController.userModel.value.orders)
.snapshots()
.map((query) => query.docs.map((item) => OrderModel.fromMap(item.data(), item.id)).toList());
}
}
The utilityController.userModel.value.orders is null !!! it's not yet loaded, so all the orders are fetched :(
And even if the orders are changed... But new orders are not fetched from the orders collection
How to get over this?
Consider using like this.
class OrderController extends GetxController {
static OrderController instance = Get.find();
final isLoading = true.obs;
final isDone = false.obs;
var orders = OrderModel([]).obs;
#override
void onInit() async {
await listenForOrders();
super.onInit();
}
Future listenForOrders() async {
isLoading.value = true;
isDone.value = false;
Stream<QuerySnapshot> _userOrders;
_userOrders = getAllOrders();
_userOrders.listen((QuerySnapshot query) {
if (query.docs.isNotEmpty) {
query.docs.forEach((element) {
orders.addIf(!orders.contains(element), OrderModel.fromDocumentSnapshot(element));
});
} else {
isDone.value = true;
}
isLoading.value = false;
});
}
Stream<QuerySnapshot> getAllOrders() {
return FirebaseFirestore.instance
.collection("orders")
.where(FieldPath.documentId, whereIn: utilityController.userModel.value.orders)
.snapshots();
}
}
The best approach is to use the worker functions provided by getx controller like:
ever - is called every time the Rx variable emits a new value.
everAll - Much like ever , but it takes a List of Rx values Called every time its variable is changed. That's it.
once - is called only the first time the variable has been changed.
In my code, am trying a assign a string value to an empty string and display on the page but it keeps showing null but when I print it out, it shows the value.
String fName = '';
#override
void initState() {
super.initState();
getData();
}
getData() async {
FirebaseAuth _auth = FirebaseAuth.instance;
User _firebaseUser = _auth.currentUser;
print("============ MyHome ================");
print(_firebaseUser.uid);
_currentUser = await Database().getUserData(_firebaseUser.uid);
if (_currentUser != null) {
fName = _currentUser.firstName;
print(_currentUser.firstName);
}
}
database
Future<UserData> getUserData(String uid) async {
UserData returnValue = UserData();
try {
DocumentSnapshot _docSnapshot =
await _firestore.collection("users").doc(uid).get();
returnValue.uid = uid;
returnValue.firstName = _docSnapshot.data()["firstName"];
returnValue.lastName = _docSnapshot.data()["lastName"];
returnValue.userMail = _docSnapshot.data()["userMail"];
returnValue.userType = _docSnapshot.data()["userType"];
print("====================== on getData =============");
print(returnValue.firstName);
} catch (e) {
print(e);
}
return returnValue;
}
And whenever I try displaying the data it gives me null
Text("Hello, $fName"),
Please how do I do this or am I missing something
use setState to rebuild the widget tree with the value:
setState(() {
fName = _currentUser.firstName;
});
Since the getData function is async, flutter has already built the widget tree before getData finished. You'll now have to update the state using setstate.
setState(() {
fName = _currentUser.firstName;
});
You need to set the new state since we have made changes to the previous state (since your getData function is async.
setState(() {
fName = _currentUser.firstName;
});
I am new to flutter and am writing a new app. In the app I want to retrieve the user data from a firebase document and populate TextFields on the user screen. I can pull the data fine using DocumentSnapShot. I want to use TextEditingController and populate it with the data but I am not able to do it. I know the data is there since I can see it in debug mode. Below are snippets of my code.
Here is where I get the data and populate the TextEditingControllers:
final agentsRef = FirebaseFirestore.instance.collection(('agents'));
getCurrentAgent() async {
final DocumentSnapshot currentAgent =
await agentsRef.doc(globals.currentUid).get();
if (currentAgent == null) {
emailController.text = "";
new Future.delayed(Duration.zero, () {
final agentProvider =
Provider.of<AgentProvider>(context, listen: false);
agentProvider.loadValues(Agents());
});
} else {
// existing record
// Updates Controllers
**emailController.text = currentAgent.data[index].toString(); // THIS LINE IS WHERE I AM HAVING TROUBLE**
// Updates State
new Future.delayed(Duration.zero, () {
final agentProvider =
Provider.of<AgentProvider>(context, listen: false);
agentProvider.loadValues(widget.agents);
});
}
#override
void initState() {
getCurrentAgent();
super.initState();
}
How do I access each data element in the DocumentSnapShot?
You'll typically get the fields by their name and not by their index. So:
**emailController.text = currentAgent.data()["email"].toString();
I am trying to get data from my Firestore and store the data into a String variable named time. Then put the variable into _event.
However, when I run the code, I got null, and I don't know why.
StateFulWidget...
String event;
Map<DateTime, List> _events;
#override
void initState() {
super.initState();
Firestore.instance.collection('events').document('2019-07-
30').get().then((
DocumentSnapshot ds) {
event = ds['time'];
});
_events = {
DateTime.parse("2019-08-01"): [event]
};
}
This is my Firestore document
I am new to Flutter and I have struggled for this question for a long time. Hope someone can help me
Thank you so much
UPDATE
I change my code.
However, I am still getting errors: The method [](Intance of 'DateTime') was called on null.
String event;
Map<DateTime, List> _events;
Future<String> getData()async{
final ds = await
Firestore.instance.collection('events').document('2019-07-30').get();
return ds['time'];
}
#override
void initState() {
super.initState();
getData().then((s) {
event = s;
//when I print(s), it showed the data correctly
});
_events = {
DateTime.parse("2019-08-01"): [event]
};
Can someone shows me where I got wrong?
Thank you!
You are not waiting for the result, ie _events = .. will run before .then() clause and that is why event variable is still null;
.get() is a Future so you need to await the result.
final ds = await Firestore.instance.collection('events').document('2019-07-
30').get();
event = ds['time'];
_events = {
DateTime.parse("2019-08-01"): [event]
};
This works for me :
Firestore().instance.collection('Collection Name')
.document('Document Name').get().then((data) async {
var dataReceive = data['property Name'];
}
I have an object Dish who containes a list of ingredients and I want to get them. How can I do?
In Firebase, Dish is a Document and Ingredient is a sub collection. I tried this but it doesn't work.
class Dish{
String name;
DocumentReference reference;
List<Ingredient> ingredients;
Dish.fromMap(Map<String, dynamic> map, {this.reference}){
this.name = map['name'];
this
.reference
.collection("ingredients")
.snapshots()
.listen((QuerySnapshot snap) {
final List<DocumentSnapshot> ingredientsDocuments = snap.documents;
List<Ingredient> ing = [];
for (var i = 0; i < ingredientsDocuments.length; i++) {
ing.add(Ingredient.fromSnapshot(ingredientsDocuments[i]));
}
this.ingredients = ing;
});
}
Dish.fromSnapshot(DocumentSnapshot snapshot)
: this.fromMap(snapshot.data, reference: snapshot.reference);
#override
String toString() => "Dish<$String>";
}
class Ingredient{
final String name;
final DocumentReference reference;
Ingredient.fromMap(Map<String, dynamic> map, {this.reference})
: assert(map['name'] != null),
name = map['name'];
Ingredient.fromSnapshot(DocumentSnapshot snapshot)
: this.fromMap(snapshot.data, reference: snapshot.reference);
#override
String toString() => "Ingredient<$String>";
}
How are you trying to fetch data from Firestore using Dish class? Were you using any asynchronous task(i.e. Future)? What's not working in your implementation? Any errors that you received?
Since I'm unable to run the repro you've provided, here's a sample code that you can try.
List<Ingredient> ingredients;
// call getDocuments() to fetch data from Firestore and add it to the List
Future<void> getDocuments() async {
ingredients = List();
var collection = FirebaseFirestore.instance
.collection('ingredients');
collection.get().then((value) {
value.docs.forEach((element) {
setState(() {
// add the object to the List
ingredients.add(Ingredient(Ingredient.fromMap(element.data())));
});
});
});
}
As for the Object, it can be as simple as this. No need to pass DocumentReference since we'll only be using it to map the data to the Object and be able to add it in the List.
class Ingredients {
var name;
Ingredients(Ingredients document) {
this.documentName = document.getName();
}
dynamic getName() => name;
Ingredients.fromMap(Map<dynamic, dynamic> document)
: name = document['name'];
}
You can check a working sample I've posted in here. It has pagination added, but it should have a similar approach with the code snippets I've shared here.