Firebase Query Double Nested

Question

Given the data structure below in firebase, i want to run a query to retrieve the blog \'efg\'. I don\'t know the user id at this point.

{Users :
     \"123         


        

Answer 1

Given your current data structure you can retrieve the User that contains the blog post you are looking for.

const db = firebase.database()
const usersRef = db.ref('users')
const query = usersRef.orderByChild('blogs/efg').limitToLast(1)
query.once('value').then((ss) => {
  console.log(ss.val()) //=> { '7654321': { blogs: {...}}}
})

You need to use limitToLast since Objects are sorted last when using orderByChild docs.