问题
There is this list of Books in the Firebase Realtime Database:
[
{
title: "Don't Make Me Think",
upvotes: 110
},
{
title: "The Mythical Man Month",
upvotes: 111
},
{
title: "Code Complete 2",
upvotes: 112
}
]
By default, the query below returns this list in ASC order:
firebase.database().ref('books').orderByChild('upvotes')
How can I query and order them by upvotes DESC instead?
回答1:
Unfortunately firebase doesn't allow returning by descending order. I have generally just reversed the order of the results returned client side.
If your data query is too large to sort client side you can do
firebase.database().ref('books').orderByChild('ups').limitToLast(2)
and then invert the results from there. Documentation can be seen here
来源：https://stackoverflow.com/questions/45357920/sorting-in-descending-order-in-firebase-database