I want to get documents from Firestore with the conditions. There are 5 conditions where 4 of which are optional. If I use where with streamBuilder, I have to create many indexes.
So, I'm going to try this method, I want to get your opinion about this.
Create a list for the store DocumentSnapshot
List<DocumentSnapshot> documents = [];
Store the snapshot to List
documents = streamSnapshot.data.docs;
Filter data like this:
if (searchText.length > 0) {
documents = documents.where((element) {
return element
.get('Title')
.toString()
.toLowerCase()
.contains(searchText.toLowerCase());
}).toList();
}
Related
I can't seem to figure out how to get a List after querying a specific Firestore collection.
I want the function to:
Query the 'chat' collection on the field 'users'.
Retrieve only the document (should be only one but could be an error and there's more than one) where users, which is a LIST of Document Reference, matches two specific references: chatUserRef and authUserRef
The function should return a list of the Document References referring to this chat collection
This is what I am trying:
import 'package:cloud_firestore/cloud_firestore.dart';
Future<List<ChatsRecord>> getChatDoc(
DocumentReference chatUserRef,
DocumentReference authUserRef,
) async {
// Add your function code here!
final firestore =
FirebaseFirestore.instance; // Get a reference to the Firestore database
final collectionRef =
firestore.collection('chats'); // Get a reference to the collection
final filteredDocuments = collectionRef.where('users', isEqualTo: [
authUserRef,
chatUserRef
]); // Use the `where` method to filter the list of documents
final queryDocuments = await filteredDocuments
.get(); // You can then use the get method on this Query object to retrieve the list of documents AS a Snapshot Document (this is NOT a list of the Documents themselves).
List<ChatsRecord> listChatDocs = [];
// Cast the Snapshot Documents to a map
// Extract the Document Reference ID
// cast the query document to a map for e
// (should I forEach?)
List<ChatsRecord> listChatDocs = queryDocuments.docs.map((e) {
return FirebaseFirestore.instance.doc('chats/$e.id');
}).toList();
return listChatDocs;
}
Try using the arrayContainsAny instead of EqualTo in your where clause.
Like this:
final filteredDocuments = collectionRef.where('users', arrayContainsAny: [
authUserRef,
chatUserRef
]);
I'm creating todo list in which I'll have two lists one for incomplete tasks and another for completed tasks...I'm able to retrieve the data from Firestore by pulling the whole data without any condition, but for the uncompleted list, I want to retrieve the document only with particular field values. For example, each document contains the following fields as shown in the picture:
Here is the code which I've used to get the data from firebase firestore:
static List<Task> getTasks() {
//convert firebase collection to list
List<Task> tasks = [];
FirebaseFirestore.instance.collection('Todos').snapshots().listen((data) {
data.docs.forEach((doc) {
tasks.add(Task.fromMap(doc.data()));
});
});
return tasks;
}
I want similar function like this to retrieve only documents with taskStatus == true. So, I can store all those tasks which have taskStatus of true on separate list and display them accordingly.
You can use the where function. It works like below.
For more: Cloud FireStore Filtering
FirebaseFirestore.instance
.collection('Todos')
.where('taskStatus', isEqualTo: true)
.snapshots().listen((data) {
data.docs.forEach((doc) {
other_tasks.add(Task.fromMap(doc.data()));
});
});
Can i search a Firestore DocumentID with a List<String>?
I am trying to search through my collection with some selection of documentID in a List. The List will consist of few String. Can I search through the Firestore collection using this?
This is the List:
List<String> _selectedBusStop = List<String>();
This is the code I used in finding the DocumentID based on the list that is in here.
Future <void> saveRoute(_selectedBusStop) async{
Firestore.instance.collection('markers').where('BusstopName', isEqualTo: _selectedBusStop)
.snapshots().listen((location) {
if(location.documents.isNotEmpty){
for (int i = 0; i < location.documents.length; i++){
initRoute(location.documents[i].data, location.documents[i]);
}
}
});
setState(() {
});
}
I am using where and isEqualTo or is this approach wrong? Any idea how to make it work for this part? Thank you in advance for your help.
Update:
This is how my Firestore looks like:
The List have some of the BusstopName but not all of it. I do not want to retrieve all the data from the Firestore just the one that is in the List. Sorry for causing so many misunderstanding.
Use the whereIn operator, like this:
Future <void> saveRoute(_selectedBusStop) async{
Firestore.instance.collection('markers').where('BusstopName', whereIn: _selectedBusStop)
.snapshots().listen((location) {
if(location.documents.isNotEmpty){
for (int i = 0; i < location.documents.length; i++){
initRoute(location.documents[i].data, location.documents[i]);
}
}
});
setState(() {
});
}
Assuming your documents have a unique id stored in the field BusstopName and also the documents actual id matches the content of this field, you have 2 possibilities.
(1) .where query
query data with collection("markers").where("BusstopName", "=", "yourBuststopId").
this returns a querySnapshot Object, on which you can call .size to check if there were any documents with that Id found (could be more than 1 if you have an inconsistent database).
(2) .doc query
query data with collection("markers").doc("yourBuststopId")
this returns a documentSnapshot Object, on which you can call .exist to check if the document actually exsists.
In both cases you need to do 1 query per Id, because Firestore queries only support equality and range operations. See this similar SO question. I would suggest to do the queries asynchronously, otherwise the time to execute will increase with the size of the array.
If you are concerned about costs, you only get billed for the results that actually return documents that exist.
you might also try this:
FirebaseFirestore.instance
.collection('markers')
.where('BusstopName', arrayContainsAny: ['Utar Bus Stop', 'Garden Bus Stop'])
.get()
.then(...);
Taken from the examples documentation
I tried with different ways but i can't edit the structure of code
//First way
QuerySnapshot querySnapshot = await db.firestoreInstance.collection('user-history').get();
var list = querySnapshot.docs;
print('MY LIST ===== $list');
//Second way
final CollectionReference collectionRef = db.firestoreInstance
.collection(historyCollection);
print('MY SECOND LIST ===== $list');
collectionRef.get().then((qs) {
qs.docs.forEach((element) {
print('MY doc id ${element.id}');
});
});
In my firebase collection(historyCollection) i have four documents but the debugger returns me empty array []. Is there another way to call all documents in certain collection through flutter?
I'm trying to call this method through FutureBuilder component.
My version of firestore is: "cloud_firestore: ^0.16.0+1"
This should do the trick:
Future<List<dynamic>> getCollection(CollectionReference collection) async {
try {
QuerySnapshot snapshot = await collection.get();
List<dynamic> result = snapshot.docs.map((doc) => doc.data()).toList();
return result;
} catch (error) {
print(error);
return null;
}
}
The entire problem was not from these fragments of code. This problem is came out from this that my collections have subcollections. I read about this and i understand that subcollections can live without their ancestors and the only way to access parents is to do this is directly specify the exact path and name of the document. To work this code in my case was needed to add dummy components of my entire set of collections. For more information please look up these two topics:
-> https://firebase.google.com/docs/firestore/using-console
-> Firestore DB - documents shown in italics
I'm trying to fetch a list of documents (documentID) from Firestore and add it to a List. I have seen some options but since I am a little new in this area, perhaps the obvious is becoming difficult for me. And I don't know exactly where in the code those lines should go, for example in an initState.
This is one of the options that I have chosen, but it only generates instances and not the name of the documents as such.
final QuerySnapshot result =
await Firestore.instance.collection('submits').getDocuments();
final List<DocumentSnapshot> documents = result.documents;
List<String> myListString = []; // My list I want to create.
myListString.add(documents); // The way I try to add the doc list to my String list.
Example the data base. I want to get a list of the document ID to a List-String-
enter image description here
And if possible, you could tell me if there is an analogous way to apply it to obtain a List but in the case of two or more collections.
It seems like what you want is a list of the document ids, right?
If so, this should work:
final QuerySnapshot result =
await Firestore.instance.collection('submits').getDocuments();
final List<DocumentSnapshot> documents = result.documents;
List<String> myListString = []; // My list I want to create.
documents.forEach((snapshot) {
myListString.add(snapshot.documentID)
});