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Learn MongoDB 4.x

You're reading from   Learn MongoDB 4.x A guide to understanding MongoDB development and administration for NoSQL developers

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Product type Paperback
Published in Sep 2020
Publisher Packt
ISBN-13 9781789619386
Length 610 pages
Edition 1st Edition
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Author (1):
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Doug Bierer Doug Bierer
Author Profile Icon Doug Bierer
Doug Bierer
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Table of Contents (22) Chapters Close

Preface 1. Section 1: Essentials
2. Introducing MongoDB 4.x FREE CHAPTER 3. Setting Up MongoDB 4.x 4. Essential MongoDB Administration Techniques 5. Section 2: Building a Database-Driven Web Application
6. Fundamentals of Database Design 7. Mission-Critical MongoDB Database Tasks 8. Using AJAX and REST to Build a Database-Driven Website 9. Section 3: Digging Deeper
10. Advanced MongoDB Database Design 11. Using Documents with Embedded Lists and Objects 12. Handling Complex Queries in MongoDB 13. Section 4: Replication, Sharding, and Security in a Financial Environment
14. Working with Complex Documents Across Collections 15. Administering MongoDB Security 16. Developing in a Secured Environment 17. Deploying a Replica Set 18. Replica Set Runtime Management and Development 19. Deploying a Sharded Cluster 20. Sharded Cluster Management and Development 21. Other Books You May Enjoy

Using the mongo shell to build a query

We will start by modeling the query, either using MongoDB Compass or directly from the mongo shell. In order to run this query, we need information from the bookings collection's bookingInfo field (described in Chapter 7, Advanced MongoDB Database Design). You can see that there is often a twist. In this case, the twist is that we must be sure to only include bookings where the payment status is confirmed.

Query criteria are grouped together using the $and query operator. We use a regular expression to match the target year of 2018. In addition, we add a condition that specifies that only documents where the payment status is confirmed are matched. It is also worth mentioning at this point that in order to reference a property of an embedded object, you should use a dot (.) as a separator. Thus, in order to match arrivalDate, which is a property of the object represented by the bookingInfo field, we use this syntax:

bookingInfo.arrivalDate...
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