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Ruby On Rails Interview Questions Easy, Medium, and Hard. ☁️
Difficulty level: Easy 👌
Difficulty level: Medium😁
Difficulty level: Hard  😫
Last Updated: Jun 12, 2024

Ruby on rails interview questions

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18 Jun, 2024 @ 01:30 PM

In this blog, we will discuss the Ruby On Rails Interview Questions but before that, let’s learn what is ruby on rails.

Ruby on Rails is used to create online apps and services across many industries. It's a popular web framework for new businesses because of its simplicity, which allows for rapid application development with a limited number of teams. Do you want to work on Ruby on Rails? If yes, then you are on the right road. We will divide the question into three difficulty levels easy, medium, and hard. This blog will teach Ruby On Rails Interview Questions, what to anticipate and how to conquer the next interview. 

Ruby on rails interview questions og


Ruby On Rails Interview Questions Easy, Medium, and Hard. ☁️

Hiring managers may have several tasks, including conducting interviews. Detailed technical interviews may enhance efficiency and time management by allowing hiring managers to focus solely on candidates with the necessary role-related abilities by assessing your knowledge by asking Ruby on rails interview questions.

interview sample image

Difficulty level: Easy 👌

The interviewer will start by asking easy-level Ruby on rails interview questions, and you need to answer them quickly with valid points. Below are some easy questions that will help you in your interview.

1. What are the functions of the subdirectories app/controllers and app/helpers?

The app/controllers aid Rails in finding controller classes and effectively handles a user web request; the helper stores any helper classes that assist the controller, model, and view classes.

2. What exactly is Ruby on Rails?

Ruby on Rails is a web application framework that is open source. It is written in the Ruby language and aids in the creation of numerous apps.

3. Give five examples of what Rails Migration can achieve.

Rails Migration allows you to rename a table, add a column, change a column, drop a table, remove a column, and many other things.

4. What command can you use to make a topic controller?

We can use this command to make a topic controller.

C:\ruby\library> ruby script/generate controller subject

5. What exactly is the Rails Controller?

Rails Controller is the heart of your application, facilitating overall user, view, and model interaction. It's also noted for properly managing URLs and controlling auxiliary modules and sessions.

6. What is the purpose of trash collection in Ruby on Rails?

Garbage collection serves several functions, including deleting pointer values and removing objects from memory that is not accessible, among others. In short, garbage collection aids in the release of memory for other processes.

7. How can Rails be protected from Cross-Site Request Forgery?

To guard against Cross-Site Request Forgery attempts by hackers, add "protect from forgery" in your ApplicationController.

8. What are some of the benefits of utilizing Ruby on Rails?

Ruby on Rails offers several benefits. It increases the productivity of a programmer's job. It's also entirely open-source and free. Furthermore, it enables programmers to construct code that operates on actual code rather than data.

9. Name three Ruby on Rails limitations.

Ruby on Rails lacks many functionalities, making it unsuitable for some programmers. This includes linking to several databases at the same time, connecting to multiple database servers at the same time, and using foreign keys in databases.

10. Who is the developer of Ruby on Rails?

David Heinemeier Hansson is the programmer who developed the famous Ruby on Rails web development framework. He is also a partner at Basecamp, a web-based software development startup.

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Difficulty level: Medium😁

The medium-level Ruby on rails interview questions need close attention; listen to the interviewer's voice carefully and take some time to think about it in your mind and answer.

1.  Explain the difference between include and extend.

'extend' adds methods to the class but not to its instance, and 'include' adds methods solely to a class instance.

2. Explain the difference between Procs and Blocks.

The following differences are the primary vital points between procs and blocks. Block is just an element of a method's syntax, whereas proc contains block-like properties. Procs are objects, although blocks are not.

An argument list can only contain one block. Only block cannot be placed in a variable, although Proc can.

3. What exactly is interpolation in Ruby?

The technique of putting a string into a literal in Ruby is known as interpolation. A string can be interpolated into the literal using a Hash (#) within {}.

4. What is the definition of the defined operator in Ruby?

The defined operator indicates whether or not a passed expression is defined. If the expression is not defined, it returns null; otherwise, it returns the description string.

5. What are the different types of variables available in the Ruby class?

The primary four variables are the local variable, global variable, class variable, and instance variable.

6. Tell me how to declare a block in Ruby programming language.

The code in the block is always surrounded by the braces ({}). The "yield statement" is used to call a block. 

7. What is the critical limitation of ruby on rails?

Ruby on Rails was developed to create a CRUD web application using MVC.

Ruby on Rails does not support the following features:
1. Databases with foreign keys
2. Linking to many databases at the same time
3. Web-based soap services
4. Connection to many database servers at the same time

8. Explain how you can execute a Rails application without having to create a database.

You may run your application by uncommenting the line in the environment.rb

path=> rootpath conf/environment.rb

config.frameworks = [ action_web_service, :action_mailer, :active_record]

9. What is explicitly Rails Migration?

Rails Migration allows Ruby to modify the database schema, allowing you to utilize a version control system to keep things synced with the actual code.

10. Tell me, what things can I do with ruby?

You may use Ruby the same way as any other general-purpose programming language. Web applications, servers, system utilities, database operations, backups, parsing, and even biology and medicine are a few examples.

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Difficulty level: Hard  😫

The hard-level Ruby on rails interview questions carry more weightage. Answering them in an exemplary manner will dramatically increase your chances of selection. These questions are crucial and require a well-structured answer prepared in your mind before explaining the answer to your interviewer.

1. How do Rails implement Ajax?

Ajax-powered web pages retrieve new or altered web pages from the server instead of regular web pages, which need you to refresh the page to acquire the most up-to-date information.

Rails trigger the ajax operations by the following methods.

Some triggers fire: The trigger might be a user clicking on a link or button or changing the data in a field or on a form.

The web client contacts the server: A Java-script method, XMLHttpRequest, transfers data associated with the trigger to a server action handler. The information may be the ID of a checkbox, the entire form, or the text in the entry field.

The server processes: The server-side action handler processes the data and returns an HTML fragment to the web client.

The client-side JavaScript, which Rails create automatically, gets the HTML fragment and utilizes it to alter a specific area of the current page.

2. What exactly do you mean by scaffolding, and what benefits might Ruby provide in this regard?

Users are frequently required to create code early in project development. These codes aid in developing the application in a highly dependable and timely way, as well as close check on the operation of specific essential components. Scaffolding is done automatically in Ruby, and users are free to focus on core programming from the first day of work.

3. Create a Ruby function to determine whether a string is a palindrome.

def palindrome?(str)

   str == str.reverse


4. What genuinely are strong parameters? Explain briefly.

Many Rails projects use Strong Parameters, also known as Strong Params, to improve the security of data submitted via forms. Developers can utilize strong parameters to regulate which parameters are accepted and used by the controller. Any unnecessary or possibly dangerous parameters will be disregarded and adequately filtered out by permitting just the anticipated parameters. This is especially important when utilizing Active Model bulk assignments because several parameters may be given simultaneously.

5. A model has how many different types of associations and relationships?

When you have several models in your rails application, you must make connections between them. You may accomplish these using affiliations. Active Record supports three different kinds of associations:

One-to-one: When one object possesses precisely one of another item, the connection is one-to-one.

One-to-many: When a single item may be a member of many other objects, this is referred to as a one-to-many connection. For example, one subject may contain several books.

Many-to-many: When the first item is connected to one or more of the second object, and the second object is related to one or many of the first object, a many-to-many connection occurs.

6. What is the distinction between Ruby on Rails observers and callbacks?

In Rails, callback methods can only be called at particular points in an object's life cycle, such as validation, creation, updating, and deletion. Unlike rails observers, the rails callback is only active for a short period.

Rails observers are similar to callbacks in that they are used when a method is not directly tied to the life cycle of an object. It may be added or detached at any moment and has a longer lifespan.

7. What is the most attractive thing you've discovered about Ruby on Rail?

It strongly supports Metaprogramming, and, unlike other frameworks, all codes may be created rapidly and without regard for other sophisticated systems. In addition, big jobs may be completed quickly using this strategy, which is one of the most remarkable things about Ruby.

8. What is your specific knowledge about the Active Records Rail?

It is essentially a subset of Ruby, and the version is convenient for performing some essential duties in the database columns. The column may be reused for performing other vital duties.

9. How can you say that the ruby symbols differ from the variables?

Symbols are usually immutable, but Ruby's String is changeable. Symbols are more likely to string than simple variables. Users may keep pace with a single copy of the sign. At the same time, a single variable is insufficient for the users. Furthermore, users have the freedom to employ symbols against enums, which is not feasible with variables.

10. Tell me, how does Ruby on Rails function?

Rails is a web application framework that integrates the Ruby programming language like HTML, CSS, and JavaScript to produce a web application that runs on a web server. Rails is a server-side, or "back end," web application development platform since it operates on a web server (the web browser is the "front end").


We have briefly covered each category of difficulty level in detail about what type of question the interviewer may ask you. We hope this blog has helped you to understand the Ruby on rails interview questions.

Recommended Readings:

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Azure Data Engineer Interview Questions


You can also check out other Interview Questions related article such as  Production Support Interview Questions.

Check out this problem - Check If A String Is Palindrome

Refer to our guided paths on Coding Ninjas Studio to learn more about DSA, Competitive Programming, JavaScript, System Design, etc. Enroll in our courses and refer to the mock test and problems available; look at the Top 150 Interview Puzzles interview experiences, and interview bundle for placement preparations. Read our blogs on aptitudecompetitive programminginterview questionsIT certifications, and data structures and algorithms for best preparation.

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