android - Get document id from firebase flutter

Android - Get document id from firebase flutter

In Flutter, you can get the document ID from a Firebase document using the DocumentSnapshot object returned when you fetch the document. Here's how you can do it:

import 'package:cloud_firestore/cloud_firestore.dart'; void getDocumentId() { FirebaseFirestore.instance .collection('your_collection') .doc('your_document_id') .get() .then((DocumentSnapshot documentSnapshot) { if (documentSnapshot.exists) { print('Document ID: ${documentSnapshot.id}'); // Access other fields using documentSnapshot.data() } else { print('Document does not exist'); } }).catchError((error) { print('Error getting document: $error'); }); }

In this example, replace 'your_collection' with the name of your collection and 'your_document_id' with the ID of the document you want to retrieve. The documentSnapshot.id will give you the document ID.

Examples

  1. How to get document ID when adding a new document to Firestore in Flutter?

    • When you add a new document to Firestore without specifying an ID, Firestore generates one for you. You can retrieve this ID using the DocumentReference returned by the add method.
    FirebaseFirestore firestore = FirebaseFirestore.instance; Future<void> addDocument() async { DocumentReference ref = await firestore.collection('users').add({ 'name': 'John Doe', 'age': 25, }); String documentId = ref.id; print('Document ID: $documentId'); }

  2. How to get document ID from a specific Firestore document in Flutter?

    • If you have a document reference, you can easily retrieve its ID using the id property.
    FirebaseFirestore firestore = FirebaseFirestore.instance; void getDocumentId() { DocumentReference ref = firestore.collection('users').doc('docID'); String documentId = ref.id; print('Document ID: $documentId'); }

  3. How to get document ID from Firestore snapshot in Flutter?

    • If you're working with snapshots, you can get the document ID from the DocumentSnapshot.
    FirebaseFirestore firestore = FirebaseFirestore.instance; void getDocumentIdFromSnapshot() async { DocumentSnapshot snapshot = await firestore.collection('users').doc('docID').get(); String documentId = snapshot.id; print('Document ID from Snapshot: $documentId'); }

  4. How to retrieve all document IDs in a Firestore collection in Flutter?

    • To get all document IDs in a collection, you can query the collection and extract the IDs from the QuerySnapshot.
    FirebaseFirestore firestore = FirebaseFirestore.instance; Future<void> getAllDocumentIds() async { QuerySnapshot querySnapshot = await firestore.collection('users').get(); List<String> documentIds = querySnapshot.docs.map((doc) => doc.id).toList(); print('Document IDs: $documentIds'); }

  5. How to update a Firestore document by ID in Flutter?

    • You can update a document using its ID with the update method on DocumentReference.
    FirebaseFirestore firestore = FirebaseFirestore.instance; Future<void> updateDocument() async { DocumentReference ref = firestore.collection('users').doc('docID'); await ref.update({ 'age': 30, }); print('Document updated.'); }

  6. How to delete a Firestore document by ID in Flutter?

    • Use the delete method on DocumentReference to remove a document by its ID.
    FirebaseFirestore firestore = FirebaseFirestore.instance; Future<void> deleteDocument() async { DocumentReference ref = firestore.collection('users').doc('docID'); await ref.delete(); print('Document deleted.'); }

  7. How to check if a Firestore document exists by ID in Flutter?

    • To check if a document exists, you can use the get method on a DocumentReference and check the exists property of the DocumentSnapshot.
    FirebaseFirestore firestore = FirebaseFirestore.instance; Future<void> checkDocumentExists() async { DocumentReference ref = firestore.collection('users').doc('docID'); DocumentSnapshot snapshot = await ref.get(); bool exists = snapshot.exists; print('Document exists: $exists'); }

  8. How to get Firestore documents by a specific field value in Flutter?

    • You can query a collection by a specific field value to retrieve the documents matching that value.
    FirebaseFirestore firestore = FirebaseFirestore.instance; Future<void> getDocumentsByField() async { QuerySnapshot querySnapshot = await firestore.collection('users').where('name', isEqualTo: 'John Doe').get(); List<DocumentSnapshot> documents = querySnapshot.docs; print('Documents found: ${documents.length}'); }

  9. How to add a Firestore document with a custom ID in Flutter?

    • You can create a document with a specific ID by using the set method on DocumentReference.
    FirebaseFirestore firestore = FirebaseFirestore.instance; Future<void> addDocumentWithCustomId() async { DocumentReference ref = firestore.collection('users').doc('customDocID'); await ref.set({ 'name': 'Jane Doe', 'age': 28, }); print('Document with custom ID added.'); }

More Tags

ubuntu-18.04 amazon-data-pipeline class-attributes python-3.7 associative-array trim frame-rate mp3 nhibernate ios4

More Programming Questions

More Other animals Calculators

More Fitness Calculators

More Financial Calculators

More Genetics Calculators