Auto increment a value in firebase with javascript

Question

Hello I\'m working on some firebase project and i can save my datas via javascript into firebase database. But i couldn\'t figure it out to auto increment child value (my ch

Answer 1

IMHO, I think we should use transaction to save increment_id. Please take a look here: https://firebase.google.com/docs/database/web/read-and-write#save_data_as_transactions

function toggleStar(postRef, uid) {
  postRef.transaction(function(post) {
    if (post) {
      if (post.stars && post.stars[uid]) {
        post.starCount--;
        post.stars[uid] = null;
      } else {
        post.starCount++;
        if (!post.stars) {
          post.stars = {};
        }
        post.stars[uid] = true;
      }
    }
    return post;
  });
}