Ruby on Rails Interview Questions and Answers

Posted by sivacynixit on October 17th, 2019

What exactly do you know about Ruby on Rails and how well it can be defined?
It is a server-side framework for web applications which is widely regarded as best in every aspect. It is a combination of Python and therefore it is easy to use. Also, there are various abilities of the Smalltalk, as well as Perl which have been combined in this framework which makes it one of the trusted approaches. It is basically a high level programming language with a wide scope in the present time and being an object-oriented approach, it has widely been considered as for building large-scale projects.

What exactly is the role of Active Record in the Ruby?
Its main aim is to make sure that the relation among the object and the database is maintained and all the validations can be considered on time.

Can you tell a few factors that have contributed towards the success or the popularity of Ruby on Rails?

• The Ruby on Rails has rich libraries which simply make sure that the users can get a diverse array of support without worrying about anything
• It is actually easy to learn and can simply be trusted for coming out with the large scale projects without having dependency on third-party approaches
• The users can always make sure of less coding and with a very limited number of bugs that can easily be avoided
• It is basically an open source approach with license needs not very complex
• A very helpful community is already present across the globe which has expertise in this web application framework to help those who are new
• The extensible nature and he true=object oriented nature of this approach has also contributed widely for the success and fame it has in the present time

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What Is Rails?

1. Rails is a extremely productive web-application framework written in Ruby language by David Hansson.

2. Rails are an open source Ruby framework for developing database-backend web applications.
3. Rails include everything needed to create a database-driven web application using the Model-View-Controller (MVC) pattern.

Explain About Restful Architecture?

RESTful: REST stands for Representational State Transfer. REST is an architecture for designing both web applications and application programming interfaces (API’s), that’s uses HTTP.

RESTful interface means clean URLs, less code, CRUD interface. CRUD means Create-READ-UPDATE-DESTROY. In REST, they add 2 new verbs, i.e, PUT, DELETE.

What Is Orm In Rails?

ORM tends for Object-Relationship-Model, where Classes are mapped to table in the database, and Objects are directly mapped to the rows in the table.

How Many Types Of Associations Relationships Does A Model Have?

When you have more than one model in your rails application, you would need to create connection between those models. You can do this via associations. Active Record supports three types of associations:

one-to-one: A one-to-one relationship exists when one item has exactly one of another item. For example, a person has exactly one birthday or a dog has exactly one owner.

one-to-many: A one-to-many relationship exists when a single object can be a member of many other objects. For instance, one subject can have many books.

many-to-many: A many-to-many relationship exists when the first object is related to one or more of a second object, and the second object is related to one or many of the first object.

You indicate these associations by adding declarations to your models: has_one, has_many, belongs_to, and has_and_belongs_to_many. Take your career to new heights of success with Ruby on rails Online Training

What Are Helpers And How To Use Helpers In Ror?

Helpers are modules that provide methods which are automatically usable in your view. They provide shortcuts to commonly used display code and a way for you to keep the programming out of your views. The purpose of a helper is to simplify the view.

 What Is Mvc? And How It Works?

MVC tends for Model-View-Controller, used by many languages like PHP, Perl, Python etc. The flow goes like this:

Request first comes to the controller, controller finds and appropriate view and interacts with model, model interacts with your database and send the response to controller then controller based on the response give the output parameter to view.

How Many Types Of Callbacks Available In Ror?

1. before_validation

2. before_validation_on_create
3. validate_on_create
4. after_validation
5. after_validation_on_create
6. before_save
7. before_create
8. after_create
9. after_save

Mention what are the positive aspects of Rails?

Rails provides many features like

• Meta-programming: Rails uses code generation but for heavy lifting it relies on meta-programming. Ruby is considered as one of the best language for Meta-programming.
• Active Record: It saves object to the database through Active Record Framework. The Rails version of Active Record identifies the column in a schema and automatically binds them to your domain objects using metaprogramming
• Scaffolding: Rails have an ability to create scaffolding or temporary code automatically
• Convention over configuration: Unlike other development framework, Rails does not require much configuration, if you follow the naming convention carefully
• Three environments: Rails comes with three default environment testing, development, and production.
• Built-in-testing: It supports code called harness and fixtures that make test cases to write and execute.

Explain how Symbol is different from variables?

Symbol is different from variables in following aspects

• It is more like a string than variable
• In Ruby string is mutable but a Symbol is immutable
• Only one copy of the symbol requires to be created
• Symbols are often used as the corresponding to enums in Ruby

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