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ruby-on-rails-interview-questions

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A list of common questions with answers ask during interview of ruby on rails job.

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<h3 align="center">Ruby on Rails Interview Questions! :tada:</h3>
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##### What are the advantages of using Ruby on Rails in Web Development?
* A good article from [Sentia](http://www.sentia.com.au/blog/8-benefits-of-using-ruby-on-rails-for-web-development)
* A good article from [Toptal](http://www.toptal.com/ruby-on-rails/after-two-decades-of-programming-i-use-rails)

##### What are the disadvantages of using Ruby on Rails in Web Development?
* A nice answer from [StackExchange](http://programmers.stackexchange.com/a/85576/142368)

##### What do you mean by `Agile Development`?
* A good page on [WikiPedia](https://en.wikipedia.org/wiki/Agile_software_development)
* A good explaination on [TutotialsPoint](http://www.tutorialspoint.com/sdlc/sdlc_agile_model.htm)

##### Explain MVC in terms of Rails.
* A good explaination on [TutotialsPoint](http://www.tutorialspoint.com/ruby-on-rails/rails-framework.htm)

##### What are different components of Ruby on Rails?
* [Slidershare] (http://www.slideshare.net/ifuturz/get-aware-of-ruby-on-rails-components)

##### Give list of frameworks which is similar to Rails.
##### What makes Ruby different from other programming languages?
##### What do you mean by Meta Programming?
##### Explain how everything is an object in Ruby.
##### How could you explain the Ruby OOP model?
##### Give difference between last 3 versions of Rails.
##### What's the major improvements in Rails 5.0?
* A good article from [Site Point](http://www.sitepoint.com/whats-new-rails-5/)
* Another good blog post from [Michelada] (http://blog.michelada.io/whats-new-in-rails-5)

##### What do you mean by ORM?

##### What is the difference between eager and lazy loading in rails?
* A good explanation can be found from [spritle.com] (https://www.spritle.com/blogs/2011/03/17/eager-loading-and-lazy-loading-in-rails-activerecord/

##### What is Self-Referential Association aka Self Join?
* A good explanation from [Rails Casts] (http://railscasts.com/episodes/163-self-referential-association)

##### List down types of associations in Rails.
##### What is functionality of `Helpers`?
##### Explain eagerloading.
* A good article with types of preloading [eagerloading] (http://blog.arkency.com/2013/12/rails4-preloading)

##### What are your favourite Gems?
##### Define block, proc and lambda and give difference between them.
##### What is ActiveRecord?
##### Explain Active Record Callbacks.
* A good explanation from [Ruby on Rails Guides] (http://guides.rubyonrails.org/active_record_callbacks.html)

##### Explain Filters.
##### Define resource, resources, collection and namespace in terms of routes.
##### List down servers supported by Rails.
##### What things we can define within `Model`?
##### What is Asset Pipeline?
* [Official documentation](http://guides.rubyonrails.org/asset_pipeline.html)

##### How parsing has been done from ERB file to HTML?
##### What is difference between `String` and `Symbol`?
* Necessary information about Strings and Symbols could be found [there](http://www.reactive.io/tips/2009/01/11/the-difference-between-ruby-symbols-and-strings/)

##### What is difference between `Render` and `Redirect`?
##### What is difference between `Gems` and `Plugins`?
##### What is difference between `Gemfile` and `Gemfile.lock`?
##### What is difference between `save` and `save!`
##### What is difference between `find` and `find_by_xxx` method?
##### What is difference between `includes` and `extends`?
##### What is difference between `form_for` and `form_tag`?
##### What is difference between `TDD` and  `BDD`?
##### What is difference between `Application Server` and `Web Server`?
##### What is difference between `==`, `===`, `eql?` and `equal?`?
##### What is single table inheritance(STI) in Rails?
* Necessary information could be found [here](https://api.rubyonrails.org/classes/ActiveRecord/Inheritance.html)
##### What is polymorphic associations in Rails? How it is differ from single table inheritance?
* Necessary information could be found [here](https://medium.freecodecamp.org/single-table-inheritance-vs-polymorphic-associations-in-rails-af3a07a204f2)
##### What will be printed after running the code [here](https://gist.github.com/engr-hasanuzzaman/9556121c9fd954eb077ac39ed19fe8d1)?
* Awswer of the above question is [here](https://gist.github.com/engr-hasanuzzaman/8080ceb3394e83de6412f44710149387)
##### Lets say you have a controller method that you want to access from view. How will you do that?

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## Contribution Guidelines

* The question must be unique
* Question must be related with Ruby/Rails
* A pull request must contain only single question

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