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Angular Services

You're reading from   Angular Services -

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Product type Paperback
Published in Feb 2017
Publisher Packt
ISBN-13 9781785882616
Length 294 pages
Edition 1st Edition
Languages
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Toc

Table of Contents (9) Chapters Close

Preface 1. Setting Up the Environment 2. Introducing Wire-Frames FREE CHAPTER 3. The Collector Service - Using Controllers to Collect Data 4. The Rating Service - Data Management 5. The Notifier Service - Creating Cron Jobs in Angular 6. The Evidence Tree Builder Service - Implementing the Business Logic 7. The Report Generator Service - Creating Controllers to Set Report Template 8. The Accuracy Manager Service - Putting It All Together

Chapter 4.  The Rating Service - Data Management

So far we have collected news headlines from CNN and saved them to the Firebase Realtime Database successfully. In this chapter, we are going to implement a service that has three main responsibilities:

  • Create and save a rating logic
  • Query the recorded news
  • Calculate the rank and sort the collected items based on their rank

While doing these steps we will learn about how to query Firebase objects and extract the piece of data that we are looking for. But before we continue, please be advised that the purpose of the Ranking Service in our project is to help us to find which headline is worth investigation.

So basically it is just a helper and at the end of the day, you are the one who will decide which headline you should chose. In other words, in this chapter we will use the Rating service just to get some insight and find a direction. However, in the chapters to come - especially when we set everything in auto pilot mode - we will...

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