Book Image

Learn MongoDB 4.x

By : Doug Bierer
Book Image

Learn MongoDB 4.x

By: Doug Bierer

Overview of this book

When it comes to managing a high volume of unstructured and non-relational datasets, MongoDB is the defacto database management system (DBMS) for DBAs and data architects. This updated book includes the latest release and covers every feature in MongoDB 4.x, while helping you get hands-on with building a MongoDB database app. You’ll get to grips with MongoDB 4.x concepts such as indexes, database design, data modeling, authentication, and aggregation. As you progress, you’ll cover tasks such as performing routine operations when developing a dynamic database-driven website. Using examples, you’ll learn how to work with queries and regular database operations. The book will not only guide you through design and implementation, but also help you monitor operations to achieve optimal performance and secure your MongoDB database systems. You’ll also be introduced to advanced techniques such as aggregation, map-reduce, complex queries, and generating ad hoc financial reports on the fly. Later, the book shows you how to work with multiple collections as well as embedded arrays and documents, before finally exploring key topics such as replication, sharding, and security using practical examples. By the end of this book, you’ll be well-versed with MongoDB 4.x and be able to perform development and administrative tasks associated with this NoSQL database.
Table of Contents (22 chapters)
1
Section 1: Essentials
5
Section 2: Building a Database-Driven Web Application
9
Section 3: Digging Deeper
13
Section 4: Replication, Sharding, and Security in a Financial Environment
14
Working with Complex Documents Across Collections

Response strategy base class

All of the response strategy classes return data. We need to decide what else should be returned. Here are the keys we return in the JSON response for the purposes of this discussion:

Key Description
status HTTP status code
data or error Data if the operation is successful, and there is data to be returned
Error if a problem was encountered
link The original page requested

 

In the base class, we need to import the json module and define a few properties needed:

# web.responder.strategy.base
import json
class Base :
headers = []
data = {}
error = ''
status = 200
link = ''

Next, even though HTTP status codes are available in the http.HTTPStatus class (https://docs.python.org/3/library/http.html#http.HTTPStatus), the codes are configured as an enum, which proves awkward to use for our purposes. Accordingly, we define the HTTP status codes we use as a dictionary:

    http_status  = ...