Displays a user list based on someone who has been chatting

[ahzanfariz]

Hello Team,
I like your project and it works well to use.

right now, i want to display a user list based on someone who has chat on me or vice versa.
I saw idFrom and idTo there.

how to do query it so that only those who ever chat have been displayed?

[MaheshPeri19]

I am storing like in below format to get only chatted users.

const kFirebaseUsersCollectionKey = "users";
const kFirebaseTextChattedUsersKey = "chatted_users";

class FirebaseHelpers {

// Saving peer user details in current user collection.
static Future saveChattedUsersListWithCurrentUser(
{String currentUserId,
String currentUserName,
String peerId,
String peerName}) async {
final QuerySnapshot result = await FirebaseFirestore.instance
.collection(kFirebaseUsersCollectionKey)
.doc(currentUserId)
.collection(kFirebaseTextChattedUsersKey)
.where(kFirebaseUserId, isEqualTo: peerId)
.get();

final List<DocumentSnapshot> documents = result.docs;

// print("chatted user documents is $documents");

if (documents.length == 0) {
  await FirebaseFirestore.instance
      .collection(kFirebaseUsersCollectionKey)
      .doc(currentUserId)
      .collection(kFirebaseTextChattedUsersKey)
      .doc(peerId)
      .set({
    kFirebaseChattedUserId: peerId,
    kFirebaseChattedUserName: peerName,
    kFirebaseChattedFollowUp: kFollowUpButtonTitle
  });
} else {
  await FirebaseFirestore.instance
      .collection(kFirebaseUsersCollectionKey)
      .doc(currentUserId)
      .collection(kFirebaseTextChattedUsersKey)
      .doc(peerId)
      .update({
    kFirebaseChattedUserId: peerId,
    kFirebaseChattedUserName: peerName,
    kFirebaseChattedFollowUp: kFollowUpButtonTitle
  });
}

}

// Saving current user details in peer user collection.
static Future saveChattedUsersListWithPeerUser(
{String currentUserId,
String currentUserName,
String peerId,
String peerName}) async {
final QuerySnapshot result = await FirebaseFirestore.instance
.collection(kFirebaseUsersCollectionKey)
.doc(peerId)
.collection(kFirebaseTextChattedUsersKey)
.where(kFirebaseUserId, isEqualTo: currentUserId)
.get();

final List<DocumentSnapshot> documents = result.docs;

// print("chatted user documents is $documents");

if (documents.length == 0) {
  await FirebaseFirestore.instance
      .collection(kFirebaseUsersCollectionKey)
      .doc(peerId)
      .collection(kFirebaseTextChattedUsersKey)
      .doc(currentUserId)
      .set({
    kFirebaseChattedUserId: currentUserId,
    kFirebaseChattedUserName: currentUserName,
    kFirebaseChattedFollowUp: kFollowUpButtonTitle
  });
} else {
  await FirebaseFirestore.instance
      .collection(kFirebaseUsersCollectionKey)
      .doc(peerId)
      .collection(kFirebaseTextChattedUsersKey)
      .doc(currentUserId)
      .update({
    kFirebaseChattedUserId: currentUserId,
    kFirebaseChattedUserName: currentUserName,
    kFirebaseChattedFollowUp: kFollowUpButtonTitle
  });
}

}
}