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Ruby On Rails Interview Questions and Answers

Ques 51. What are the key deployment challenges in Ruby on Rails?

heroku makes deployment easy.

Things that I sometimes run into are:

> Mismatched gem versions between local and production environment

> Some lessons learned:

Use image_tag helper each time

Specify root path in ENV variable

Configure assets pipeline by setting: config.assets.enabled = true in the config/application.rb file

Configure Capistrano script to precompile assets 

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Rails already has the logic built into it to prevent SQL injection attacks if you follow the right syntax. 

Say you are trying to authenticate a user based on their login and password you might be tempted to use a syntax as below:

User.first("login = '#{params[:name]}' AND password = '#{params[:password]}'")

If an attacker enters OR 1=1 as the name, and OR 2>1 as the password, the resulting SQL query will be:

 SELECT * FROM users WHERE login = '' OR '1'='1' AND password = '' OR '2'>'1' LIMIT 1 

This will simply find the first record in the database, and grants access to this user.

To prevent this type of SQL injection simply use the following format.

  User.where("login = ? AND password = ?", entered_user_name, entered_password).first


User.where(:login => entered_user_name, :password => entered_password).first

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Ques 53. How can you secure a Rails Application?

Rails has a lot of in-built capabilities to deal with common web-security issues. 

> SQL Injection

> Cross-Site 

> Session fixation and Session hijacking

> Captcha

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Ques 54. What is Ruby On Rails?

  1. Ruby on Rails is an open source full-stack web application framework written in the Ruby Programming Language. Rails is capable of gathering information using pages and applications from the web server and can interact with a database and can retrieve information from the database.

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Ques 55. Why Ruby on Rails?

1.CRUD (convention over configuration) 
2. DRY Principal (Do not repeat Your self )
3. Gems and Plugins
4. Pure OOP Concept
5. Scaffolding
6.. Rest Support
7.Action Mailer
8. Rake support
9. open source
10.Rpsec Suppot for testing

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