🎁 Hierarchy
Model a tree or hierarchy for threaded comments
firestore.js
const topLevel = db.collection('comments').where('parent', '==', false);
const level = db.collection('comments').where('parent', '==', id)
const traverseAll = (id) => {
const tree = db.collection('comments')
.where('parent', '>=', id)
.where('parent', '<=', `${id}~`)
}