I have two attributes in my eventClick table eventID and userID so what I am trying to do is if eventID and userID normally exists then show You have already clicked if not then make an entry of the click. I thought of using two clause and merging it but that just resulted in insertion of the values.
I am trying using the below code
final checkSnapshot = FirebaseFirestore.instance
.collection('eventClick')
.where('eventID', isEqualTo: eventID)
.where('userID', isEqualTo: userID)
.snapshots();
I want the working to be like
if (checkSnapshot.exists) {
print('already exists');
} else {
FirebaseFirestore.instance.collection('eventClick').add({
'eventID': eventID,
'eventName': eventName,
'eventImageUrl': eventImageUrl,
'userID': userID
});
}
Can you try using .get() ? That should return a QuerySnapshot which has a 'size' property. If 0, that means no such document exists.
FirebaseFirestore.instance
.collection('eventClick')
.where('eventID', isEqualTo: eventID)
.where('userID', isEqualTo: userID)
.get()
.then((checkSnapshot) {
print(checkSnapshot.docs[0]);
if (checkSnapshot.size > 0) {
print("Already Exists");
} else {
//add the document
}
});
FirebaseFirestore.instance
.collection('task')
.where('usergroup', isEqualTo: 'software')
.where('userid', isEqualTo: 'ep434334')
.snapshots(),
Related
I am trying to get users name but Flutter gives this error:
The body might complete normally, causing 'null' to be returned, but the return type is a potentially non-nullable type.
Try adding either a return or a throw statement at the end.
Method:
String getUserNameFromUID(String uid) {
FirebaseFirestore.instance
.collection('users')
.where('uid', isEqualTo: uid)
.get()
.then((QuerySnapshot querySnapshot) {
querySnapshot.docs.forEach((doc) {
return doc["name"];
});
});
}
How can I solve my problem? if I add return 0 to end of the method it always gives 0.
It always gives 0.(I do not want 0, I want get user name from uid)
String getUserNameFromUID(String uid) {
FirebaseFirestore.instance
.collection('users')
.where('uid', isEqualTo: uid)
.get()
.then((QuerySnapshot querySnapshot) {
querySnapshot.docs.forEach((doc) {
return doc["name"];
});
});
return "0";
}
EDIT: I need a String solution, not Future. The method should return String...
Because my UI is not future builder. Isn't there any way to return one data as String in Firestore database?
First your function should return a Future<String> since it relies on firestore's get wich also returns a future. Also docs is a list, you have to return just one. The first one i guess. In the UI just use a FutureBuilder
Future<String> getUserNameFromUID(String uid) async {
final snapshot = await FirebaseFirestore.instance
.collection('users')
.where('uid', isEqualTo: uid)
.get();
return snapshot.docs.first['name'];
}
Since you can't use FutureBuilder. An ugly alternative is to pass a callback to getUserNameFromUID and call setState from there.
void getUserNameFromUID(String uid, Function (String name) onData) {
final snapshot = await FirebaseFirestore.instance
.collection('users')
.where('uid', isEqualTo: uid)
.get().then((s) => onData(s.docs.first['name']));
}
On your UI
...
getUserNameFromUID(uid, (String name){
setState(()=> name = name);
});
From your last comment just inherit from StatefulWidget. And call the function from inside.
#override
void initState() {
getUserNameFromUID(uid);
}
If you had special requirements about not being able to modify the UI, you should mention that as it conditions the way to use the backend services.
I want to build a contactScreen for my flutter app. Therefor I have to download an array from Firebase. I am just able to download directly into a listView in flutter and get stuck while coding. Heres my code:
var currentUser = FirebaseAuth.instance.currentUser!.uid;
var contacts;
getUserData() async {
var userData = await FirebaseFirestore.instance
.collection('users')
.where('uid', isEqualTo: currentUser)
.get();
contacts = userData['contacs']; //heres the error
}
At first I want to initialize the currentUser's UID and then get the currentUser's contacts array from firebase. Therefor I build the getUserData() method to download the User and then initialize his contacts array.
The last step doesn't work in Flutter, I can't access the contacts array. Is the way I want to get the data correct?
You're at the very least missing an await before the get() call:
var userData = await FirebaseFirestore.instance
.collection('users')
.where('uid', isEqualTo: FirebaseAuth.instance.currentUser!.uid)
.get();
Without await your userData is of type Future<QuerySnapshot<Map<String, dynamic>>> as you get in the error message. By using await, its type will become QuerySnapshot<Map<String, dynamic>>.
you need to call await or use FutureBuilder
like this
FutureBuilder(
future: FirebaseFirestore.instance
.collection('users')
.where('uid', isEqualTo: FirebaseAuth.instance.currentUser!.uid)
.get(),
builder: (context, snapshot) {
if (snapshot.hasData) {
return Column(
children: [Text(snapshot.data['name'])], //error here
);
}
return Loading();
},
)
How to read subcollection from flutter firestore. I am using cloud_firestore. I am successfully adding data into firestore but couldn't retrieve it(tried and failed).
I want to retrieve subCollection called product Firestore collection
I tried this I don't have the document ID Because it generated automatically from firestore :
Stream<QuerySnapshot> loadorderdetails(String uid) {
return FirebaseFirestore.instance
.collection('Users/$userid/Orders')
.doc()
.collection("Products")
.where('uid', isEqualTo: uid)
.snapshots();
}
You should try this
FirebaseFirestore.instance.collection("Users/$userid/Orders ").get().then((querySnapshot) {
querySnapshot.docs.forEach((result) {
FirebaseFirestore.instance
.collection("Users/$userid/Orders")
.doc(result.id)
.get()
.then((querySnapshot) {
//print data
});
});
});
});
I have added this collection:
Map<String, String> userDataMap = {
"userName": usernameEditingController.text,
"userEmail": emailEditingController.text,
"account": userType // there is premium and regular account type
};
...
Future<void> addUserInfo(userData) async {
Firestore.instance.collection("users").add(userData).catchError((e) {
print(e.toString());
});
}
And actually I don't know how to get info about account type, I would like to print/get value assigned to "account".
This is what I tried but it did nothing:
var ok = await Firestore.instance
.collection('users')
.where('email', isEqualTo: email)
.getDocuments();
print(ok);
Thank you in advance.
Inside the document, you have a field called userEmail and not email therefore you need to do the following:
var userDoc = await Firestore.instance
.collection('users')
.where('userEmail', isEqualTo: email)
.getDocuments();
userDoc.documents.forEach((result) {
print(result.data["account"]);
});
I am trying to implement the function below but it gives me null.
To be specific, Future credit() is not updating the variable value. There is no problem with the database because if I put print(doc['value']) instead of value += doc['value'], I get the expected result.
It seems, getCredit() is the one returning null.
Future credit() async {
final FirebaseUser user = await FirebaseAuth.instance.currentUser();
final String uid = user.uid;
int value = 0;
Firestore.instance
.collection('entries')
.where("uid", isEqualTo: uid)
.where("type", isEqualTo: "+")
.orderBy("time", descending: true)
.snapshots()
.listen((data) => data.documents.forEach((doc) => value += doc['value']));
print(value); // doesnt update value
return value;
}
int getCredit() {
credit().then((value) {print(value);});
credit().then((value) {return value;}); // return mot working
}
Thanks!
try this:
Future<int> getCredit() async {
return await credit();
}
Fixed it. It seems it was a problem with the scope of variable.
int cr = 0;
Future credit() async {
final FirebaseUser user = await FirebaseAuth.instance.currentUser();
final String uid = user.uid;
Firestore.instance
.collection('entries')
.where("uid", isEqualTo: uid)
.where("type", isEqualTo: "+")
.orderBy("time", descending: true)
.snapshots()
.listen((data) => data.documents.forEach((doc) {cr = cr + doc['value'];}));
print('$cr');
}