This question already has answers here:
Flutter: Update specific index in list (Firestore)
(2 answers)
Flutter: How to update an Array within an Array in the firestore
(1 answer)
Closed 2 years ago.
I have an array of strings present in firestore. I want to edit the string present at a particular index. How can I do this?
For example, let the array be ["help","me","please"];
How can I change "help" to "don't help" in flutter?
The closest I've gotten to editing the array is adding an element, which I do by FieldValue.arrayunion().
Is it possible to edit an element present at a particular index? Or am I gonna have to fetch the entire array, update it locally, and then upload the entire array?
It's not possible with a single update. You have to do exactly as you said: read the document, make changes to the array in memory, write the new array back to the document.
Is it possible to edit an element present at a particular index?
This is not possible.
Or am I gonna have to fetch the entire array, update it locally, and then upload the entire array?
That's indeed one option. The other option is to use an arrayUnion() and arrayRemove(), which work if the items in the array are unique.
Also see:
Flutter: Update specific index in list (Firestore)
Flutter: How to update an Array within an Array in the firestore
Related
This question already has answers here:
Is there any way to update a specific index from the array in Firestore
(3 answers)
Firestore Update single item in an array field
(2 answers)
How to update an array item in Firestore
(2 answers)
Updating an item inside an array on Firebase Flutter
(1 answer)
Closed 7 months ago.
I have the following list field in Firestore.
Now, I need to place value in seetsList[2].
FirebaseFirestore.instance.collection('Rooms').doc(widget.roomId).update({
'seetsList': FieldValue.arrayUnion(?????????????????)
});
Note: my listValue is always fixed with 5 index and peer index it has default value 0
Is this possible?
There is no way you can update an element that exists in an array by its index. This means you’ll need to:
Read the content of the array into your application code.
Update the element in the array using the desired index.
Write the entire array back to Firestore.
This resource might also help.
This question already has answers here:
Google Firestore - How to get several documents by multiple ids in one round-trip?
(17 answers)
Closed 8 months ago.
In Firestore, if I have as list of, say, 20 document IDs, what is the best way to fetch all those documents?
I'm thinking of, for example, using something like Angolia for search and getting a list of ids back from it.
Would I need to manually get or onSnaptshot each reference, or is there a more performant/simple way to fetch a list of documents just using their ID?
Thanks!
A lot of the options depends on how your firestore is structured, and what framework you're using to encorporate firebase.
Generally speaking, querying a list can be done using the in query operator.
In the case of id querying, the array is id's, and you query by firebase.firestore.FieldPath.documentId()
import { query, where } from "firebase/firestore";
const q = query(firebase.firestore.FieldPath.documentId(), where('id', 'in', ['SOME_ID_1', 'SOME_ID_2']));
This question already has answers here:
Is there any way to update a specific index from the array in Firestore
(3 answers)
Closed 2 years ago.
i want to change taken value to true on specific index of notification time stamp (array in fire base ,shown in image)so how i write my query
[1]: https://i.stack.imgur.com/aGWpI.jpg
my code:-
await FirebaseFirestore.instance
.collection('Prescriptions')
.doc(medicineDetails['id'].toString())
.update({
'NotificationTimeStamp ': FieldValue.arrayUnion([{}])
});
you can only add or remove from an array, but as a work around you can do this by changing the array in code the replacing the array in firebase.
I have created a review system, in a collection, within a document. In the document I have an array where the average of the ratings is (which when uploading the review are added), but if I upload two equal numbers with FieldValue.arrayUnion, I only get one.
That's the expected behavior of FieldValue.arrayUnion(). According to the API documentation:
Each specified element that doesn't already exist in the array will be added to the end. If the field being modified is not already an array it will be overwritten with an array containing exactly the specified elements.
FieldValue.arrayUnion() will not add an element if it already exists in the array. If you need to do that, you should read the document, modify the array in memory to contain what you want, then update the entire array back to the document.
This question already has answers here:
Firestore: how to perform a query with inequality / not equals
(7 answers)
Closed 2 years ago.
I want to retrieve all the collections except one document id. I have following query it will get all data by validating collection field. however i want to get all data except one document.
await Firestore.instance.collection('tbl').where('id',isEqualTo:textId).getDocuments().then(
(data){
dataRowCount= data.documents.length;
}
);
Firestore doesn't offer any way to exclude documents from a query. You must can only filter for known values that you're looking for, or ranges of values. If you want to skip a document, you will have to check the query results in your code and omit the one you don't want