Agregation Pipeline

Question 1

What is the aggregation pipeline?

Answer 1

It is a set of operations that every document is subject to during a query

Question 2

How is aggregation done in Mongoose?

Answer 2

ModelName.aggregate([])

Question 3

What is the input for the aggregate method in Mongoose?

Answer 3

An array of objects

Question 4

What are some aggregation operations that are commonly used?

Answer 4

$match, $group, $addFields, $unwind, $project, $sort, $limit

Question 5

What is the format for an object in the aggregation array?

Answer 5

{$operation: val}