Flutter Firebase where query

You're looking for a whereIn query, which looks like this:

FirebaseFirestore.instance
  .collection('yourdocuments')
  .where(FieldPath.documentId, whereIn: documentIds)
  .get()
  .then(...);

The list of document IDs can be up to 10 long, so if you have more than 10 document IDs you'll need to run multiple queries and merge the results in your application code.

See also:

• The FlutterFire documentation for querying Firestore
• The reference documentation for Query.where()
• The reference documentation for FieldPath.documentId.