7. Creating a To-do App with Couchbase | Couchbase Essentials

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Couchbase Essentials

By : John C Zablocki

3 (2)

Couchbase Essentials

3 (2)

By: John C Zablocki

Overview of this book

This book is for those application developers who want to achieve greater flexibility and scalability from their software. Whether you are familiar with other NoSQL databases or have only used relational systems, this book will provide you with enough background to move you along at your own pace. If you are new to NoSQL document databases, the design discussions and introductory material will give you the information you need to get started with Couchbase.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Getting Comfortable with Couchbase

1. Getting Comfortable with Couchbase

The NoSQL landscape

NoSQL taxonomies

Installing Couchbase

Ports

Running Couchbase for the first time

Exploring the Couchbase Console

Couchbase architecture

Couchbase SDKs

RAM matters

Summary

2. Using Couchbase CRUD Operations

2. Using Couchbase CRUD Operations

The Couchbase SDKs

Basic operations

Advanced CRUD operations

Storing complex types

Concurrency and locking

Asynchronous operations

Durability operations

Summary

3. Creating Secondary Indexes with Views

3. Creating Secondary Indexes with Views

Couchbase documents

Couchbase indexes

MapReduce

Couchbase views

Couchbase Console

Querying views

Couchbase SDKs and views

Summary

4. Advanced Views

4. Advanced Views

Querying by type

Nested collections

Range queries

Multiple keys per document

Compound indexes

Grouping keys

Emitting values

Querying with beer-sample

Summary

5. Introducing N1QL

5. Introducing N1QL

Installing N1QL

Simple queries

Null or missing properties

String utilities

Aggregation and math

Complex structures

Working with collections

Joins

SDK support

Summary

6. Designing a Schema-less Data Model

6. Designing a Schema-less Data Model

Key design

Document design

Summary

7. Creating a To-do App with Couchbase

7. Creating a To-do App with Couchbase

A simple to-do schema

Working with SDKs

Creating a task

Listing tasks

Showing only incomplete tasks

Nested tasks

Summary

A. Couchbase SDKs

A. Couchbase SDKs

Couchbase Java SDK

Couchbase .NET SDK

Couchbase PHP SDK

The Couchbase Node.js SDK

Couchbase Python SDK

Couchbase Ruby SDK

Couchbase C SDK

Index

Index

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Nested tasks

To make our simple task list app a little more interesting, we'll add the ability to nest tasks. In other words, we'll allow some tasks to be subtasks of other tasks. Doing so requires only a slight change to our model, for example adding a ParentId property:

public class Task
{
  public string Description { get; set; }
  public bool IsComplete { get; set; }
  public string ParentId { get; set; }
  public bool Type { get { return "task"; } }
}

There are numerous ways to set up a user interface to allow parent tasks to be set. In the interest of brevity, we'll assume that our create and edit actions and views have two simple additions:

#get all tasks returned by the  
#all_incomplete view in the tasks design document
tasks = client.query("tasks", "all_incomplete")

#when saving tasks, assign the parentId
task.parent_id = request.form["parentId"]

#pass the tasks to the view
#model passed only for edit
return render_template("index.html", model=task, tasks=tasks) 

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