firebase -> date order reverse

Question

I am currently making an app using Firebase.

It is one of those bulletin boards that can be seen anywhere on the web.

But there was one problem.

This is a matter of date sorting.

I want to look at the recent date first, but I always see only the data I created first.

postRef.orderByChild('createData').startAt(reverseDate).limitToFirst(1).on('child_added',(data)=>{
    console.log(data.val().name + data.val().createData);
})

result - >hello1496941142093

My firebase tree

My code is the same as above.

How can I check my recent posts first?

How Do I order reverse of firebase database?

Answer 1

The Firebase Database will always return results in ascending order. There is no way to reverse them.

There are two common workaround for this:

1. Let the database do the filtering, but then reverse the results client-side.
2. Add an inverted value to the database, and use that for querying.

These options have been covered quite a few times before. So instead of repeating, I'll give a list of previous answers:

• Display posts in descending posted order
• Sort firebase data in descending order using negative timestamp
• firebase sort reverse order
• Is it possible to reverse a Firebase list?
• many more from this list: https://www.google.com/search?q=site:stackoverflow.com+firebase+reverse%20sort%20javascript