Aggregation | Warlock.js

📄️ Introduction

MongoDB has a powerful Aggregation framework that allows you to perform complex queries on your data. This package provides a simple way to build and execute these queries.

📄️ Aggregate Class

We had a quick overview over the MongoDB Aggregate Framework, now let's see how we can use it in our application.

📄️ Selecting Columns / Projecting

To select/deselect fields, you can use one of three methods: select, deselect and project.

📄️ Filtering

Perform filtering on your data using the where methods.

📄️ $agg

The $agg utility is a helper that helps you build your aggregate query in a more readable way.

📄️ Skip

Skip documents in the collection.

📄️ Limit

Limit the number of documents returned from the collection.

📄️ Unwind

Unpack an array field from the input documents to output a document for each element.

📄️ Group By

This stage represents the $group stage in MongoDB.

📄️ Lookup (Joins)

Perform lookups (joins) on your collections.

📄️ Advanced Usage

Aggregate class is also shipped with more useful methods to help you use queries easily.

📄️ Delete Documents

Delete Documents using Aggregate class.

📄️ Fetching Documents

Fetching documents using Mongez Aggregate class.

📄️ Sorting

Sorting is the process of arranging documents in a collection in a specific order, The Aggregate class provides multiple methods to easily sort your documents.

📄️ Data Update

Update documents using Aggregate class.

📄️ Model Aggregate

Combine Models with Aggregate Class.