MongoDB: Aggregation Pipeline

Explorer···

▼THEEBUG

Completed0/6

Score0

THEEBUG›lesson6.js

const totals = await orders

.aggregate([

{ $group: { _id: "$userId", total: { ______: "$amount" } } },

])

.toArray();

⊕⋮

$[system] Theebug ready. Happy coding!

Code BlocksDrag blocks into the drop zones above

4 blocks available

$sum

$add

sum

$total

Game Panel

0:000 pts

Level 6 of 6Aggregation Pipeline

0/1 slots correct

Objective

Sum each user's order amounts using the aggregation pipeline's group operator

Expected Output

[{ _id: "ada", total: 150 }]

Debug says:

An aggregation pipeline processes documents through a series of stages — $group here collapses many order documents down into one total per user. Which operator adds up a field across every document in each group?

Debug the Worm