TOP-10 Interview Questions in Ruby on Rails for Freshers - ByteScout
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TOP-10 Interview Questions in Ruby on Rails for Freshers

Ruby on Rails is a web-application framework written in the programming language Ruby. Since its launch, it has successfully made a mark among the other frameworks and programming languages like Java, Python, etc. Ruby on Rails framework is easy to use, allows creativity and imagination while coding, has clear test codes, is developer-based and object-oriented. Due to these reasons, the demand for the framework is increasing day by day. Along with necessary technical knowledge and soft skills, clearing the interview is required to get a job in RoR.

Here are some questions which are most likely to be asked from the freshers:

1. What do you know about Ruby on Rails? List one advantage and drawback.

Ruby On Rails is a server-side MVC web application framework that provides structures to create your website or applications.

It is one advantage is that it has various third-party modules or libraries to help you out. They contain several features known as gems, which you can add to enhance your coding experience.

One major drawback which programmers and developers find problematic is that RoR has a slow booting speed, which means it takes a considerable amount of time to start.

2.   What do you know about the MVC framework?

MVC stands for Model-View-Controller framework.

  • Model: The model component corresponds to all the data and data-related logical information, which is processed by View and Controller components.
  • View: It is the final interface with which the user interacts. It includes UI options like text boxes, drops down menus, etc.
  • Controller: It accepts the user’s demands, gives commands to the model accordingly, and processes the view. It acts as an interface between model and view components and handles all the processes to modify data and interface.

3.   Can you draw out the comparison between Ruby and other programming languages?

Ruby is an open-source programming language that focuses on simplicity, readability, and productivity.

Ruby’s most significant advantage over other programming languages like Python, Perl, and Java is flexibility. Unlike java, where one has to follow strict C syntax during coding, Ruby enables the programmer to omit a few code lines.

4.   Can you list the principles of the framework?

DRY and COC are the principles of the RoR framework.

DRY stands for Don’t Repeat Yourself.

It facilitates programming without errors and bugs. It prevents you from writing unnecessary, repetitive codes. You can extract the common codes, place them in a single place, and then reuse them instead of repeating them, making the program easier to debug.

COC stands for convention over configuration. It means that the technology or the framework you are working on can automatically solve some issues. You don’t have to write configuration codes because the convention standards adopted by the RoR framework can, by-default, find out the solution for many of the problems.

5.   What do you mean by Active Record?

The active record handles the M, i.e., the Model, in the MVC framework. It facilitates data presentation from database rows as objects and modification of these data objects with business logic methods.

6.   Do you have any idea about ORM?

Yes! ORM stands for Object Relational Mapping. It is a technique used to connect the objects of an application to tables in a relational database management system.

ORM facilitates easy storage and retrieval of properties and relationships of the objects, in an application, from the database. There is no additional requirement of writing SQL statements or database access codes.

7.   What is OOP, and How is it different from Procedural Programming?

OOP stands for Object-Oriented Programming. It facilitates the creation of objects which contain both data and procedures. Whereas, Procedural Programming consists of writing procedures that perform operations on data.

8.   Which do you think is better among the two? And Why?

Object-oriented programming is way better than Procedural Programming as it is less complicated, faster and more comfortable, and more secure than Procedural Programming.

9.   Can you explain the concept of Class and Object with the help of an example?

Class is a broad, reusable piece of code blueprints which represent broad categories that share similar attributes. It is used to create more specific Objects, and also contain methods that perform some useful function for that particular object.

For example, We have a class  a dog with recoloring method that changes the attribute dog coat color.

This function or method is helpful for objects of class Dog.

We created a Class Dog with attributes of color, age, breed. We then create an instance of Dog type object, says Max, to represent my specific dog.

 Object: Max

 -coat color = Beige
 -age = 1 year
 -breed = Golden Retriever


Class: Dog 

 -coat color


Object: Jerry

  -coat color = Black
  -age = 6 months
  -breed = Labrador


10.   Why do most of the startups prefer the RoR framework? Also, can you list some of them?

Most startup companies prefer the RoR framework as their top choice because of the following features:

  • Saves time and effort: It has several ready-made modules and plugins, allowing the developers to avoid writing unnecessary and repetitive codes.

Coding is way faster than other frameworks here.

  • Saves money: Since RoR is an open-source framework, it allows the developers to create, modify and distribute their programs for free.

There are several third-party libraries and gems which are open to all and free of cost.

It facilitates easy creation of MVP, i.e., Minimum Viable Product.

  • Safe and secure: Security is one of the top concerns of the Ruby On Rails framework. Many built-in technologies protect and avoid cross-site request forgery, SQL injection attacks, cross-site scripting, etc.
  • Quality of the product: Despite being time-saving and cost-effective, RoR enables you to make high-quality products with minor issues and bugs. Scalability, which is the capacity to handle many requests per minute, is essential for any startup.

RoR enables you to make products with high scalability.

Startups like GitHub, Shopify, Twitter, Dribble, Airbnb, and Etsy are successful examples of the RoR framework.


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