java - how to read firestore sub-collection and pass it to FirestoreRecyclerOptions

Question

I have firestore database with root products and every products has collection 'comments' so i stored in it all users comments about this product , but when query on this comments sub-collection i get null values or zero snapshots from firestore

   private void getCommentObject(){



    query = FirebaseFirestore.getInstance()
            .collection("products").document(docID).collection("comments");

    FirestoreRecyclerOptions<CommentModel> options = new FirestoreRecyclerOptions.Builder<CommentModel>()
            .setQuery(query, CommentModel.class)
            .build();


    adapter = new FirestoreRecyclerAdapter<CommentModel, commentHolder>(options) {
        @NonNull
        @Override
        public commentHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(parent.getContext())
                    .inflate(R.layout.comment_item_layout, parent, false);

            return new commentHolder(view);
        }

        @Override
        protected void onBindViewHolder(@NonNull commentHolder commentHolder, int position, @NonNull CommentModel commentModel) {


            commentHolder.full_comment.setText(String.valueOf(commentModel.getComment()));
            commentHolder.comment_date.setText(String.valueOf(commentModel.getCommentDate()));
            commentHolder.comment_user.setText(String.valueOf(commentModel.getCommentUser()));


            Glide.with(getApplicationContext())
                    .load(commentModel.getProfilePic())
                    .into(commentHolder.userProfileImg);

        };

    };



    rv.setAdapter(adapter);
    adapter.notifyDataSetChanged();

}

and here is my commentModel calss

@IgnoreExtraProperties

public class CommentModel implements Serializable {

public CommentModel() {
}


String comment ,  commentDate , profilePic , commentUser ;

public CommentModel(String comment) {
    this.comment = comment;
}

public String getComment() {
    return this.comment;
}

public void setComment(String Comment) {
    this.comment = comment;
}

public String getCommentDate() {
    return this.commentDate;
}

public void setCommentDate(String commentDate) {
    commentDate = commentDate;
}

public String getProfilePic() {
    return profilePic;
}

public void setProfilePic(String profilePic) {
    this.profilePic = profilePic;
}

public String getCommentUser() {
    return commentUser;
}

public void setCommentUser(String commentUser) {
    commentUser = commentUser;
}

}

Answer 1

Waitting for answers