Book Image

Learning Sinatra

By : Sudeep Agarwal, Manoj Sehrawat
Book Image

Learning Sinatra

By: Sudeep Agarwal, Manoj Sehrawat

Overview of this book

<p>Sinatra is a Ruby framework that is widely used in the Industry. You can use it to make a single-page web app or a large-scale one. With the increased online footprint, you can create and deploy your own application.</p> <p>Whether you are brand-new to online learning or a seasoned expert, this book will provide you with the skills you need to successfully create, customize, and deploy a Sinatra application. Starting from the beginning, this book will cover how to install Ruby and Sinatra, construct the back-end, design and customize the front-end layout, and utilize the innovative and user-friendly features of ORMs. By sequentially working through the steps in each chapter, you will quickly master Sinatra's features to create your own application.</p> <p>With ample screenshots and code that offers a play-by-play account of how to build an application, Learning Sinatra will ensure your success with this cutting-edge framework.</p>

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Learning Sinatra
Sudeep Agarwal | Manoj Sehrawat
Apr, 2016 | 164 pages
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Table of Contents (17 chapters)
Learning Sinatra
Learning Sinatra
Credits
Credits
About the Authors
About the Authors
About the Reviewer
About the Reviewer
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Introduction to Sinatra
Introduction to Sinatra
What is MVC?
Installing Sinatra
Writing your first Sinatra application
Where is the MVC in this code?
How to achieve MVC using Sinatra
Sinatra application layout
HAML
Installing HAML
Using HAML in a Sinatra application
What did the code do?
To Sinatra or not to Sinatra?
Other frameworks
Summary
2
Introduction to Ruby
Introduction to Ruby
Installation
IRB
Ruby data types
Code blocks
Classes and objects
Control structures in Ruby
Loops
Controlling the flow of iterations
Exception handling
Summary
3
Hello World
Hello World
Getting started
The application
The code
Starting the application
Features
Object Relationship Mapper
Designing views
Summary
4
Modeling the Backend
Modeling the Backend
What is Object-relational mapping
When to use an ORM
How to define migrations
How to define models
How to run migrations
What are the responsibilites of the models?
Summary
5
Handling HTTP Requests
Handling HTTP Requests
Understanding the application file – app.rb
Writing routes for the responsibilities of the application
Sending the data and designing the views
Understanding before and after blocks
Summary
6
Designing the Frontend Layout
Designing the Frontend Layout
Understanding Twitter Bootstrap and jQuery
Writing haml templates
Writing layout.haml
Writing signup.haml
Summary
7
Handling User Data
Handling User Data
Creating forms
Summary
8
Connecting to a Database
Connecting to a Database
Connecting to a database
Summary
9
Authentication and Authorization
Authentication and Authorization
Using sessions in Sinatra
Handling authentication using session
Summary
10
Deploying the App
Deploying the App
Deployment
What is Heroku?
Using SQL on Heroku
Summary
Index
Index

Loops

Ruby has basic loop structures. You will find it very easy to understand them.

while-end

The while-end control structure is executed until the condition is true:

while <condition>
  <statements>
end

The statements are executed until the condition is false.

until-end

This loop structure is the opposite of the while-end structure:

until <condition>
  <statements>
end

The statements are executed until the statement is false.

Fixnum.times

This is similar to the for loop that you might have worked with in other languages:

Fixnum.times do
  <statements>
end

for..in

The for..in loop structure iterates over an object:

for <variable> in <object>
  <statements>
end

Here is an example:

for i in [1, 2, 3, 4, 5]
  puts i
end
Previous Section
End of Section 8
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