November 2015
Beginner to intermediate
248 pages
5h 24m
English
Content preview from Learning CouchbaseBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Views
Whenever we want to extract fields from JSON documents without the document ID, we use views. If you want to find a document or fetch information about a document with attributes or fields of a document other than the document ID, a view is the way to do it. Views are written in the form of MapReduce, which we have discussed earlier, that is, it consists of the map and reduce phase. Couchbase implements MapReduce using the JavaScript language.
The following diagram shows you how various documents are passed through the View Engine to produce an index. The view engine ensures that all documents in the bucket are passed through the map method for processing and subsequently to the reduce function to create indexes:
The View Engine
When we write ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.