Advanced interview questions for a Ruby developer by Sergiu Beșliu Feb, 2023

Also, the users are free to configure the code with the database very easily. Here are five vital advanced Ruby on Rails interview questions from the section above and answers top candidates are likely to give. In this section, you’ll find 25 advanced Ruby on Rails interview questions you can ask senior-level candidates to evaluate their knowledge. If you need any assistance with the ruby on rails developers interview, we are here to help. Rubyroid Labs Team keeps shedding some light on our working processes. This time we decided to tell you how we interview Ruby on Rails Developers to join the Team.

They allow you to use your own laptop which was great but you only get 30 minutes to finish the problem with working unit tests. I think they re-use this pair programming problem so I’m not going to divulge details here. But it wasn’t a particularly hard problem, they just want you to see how you code and test. He also specializes in eCommerce on the WooCommerce platform and other large platforms, like SFCC. Trevor is willing to leverage his skillset in new and challenging projects. There is more to interviewing than tricky technical questions, so these are intended merely as a guide.

One way to improve performance is by adding caching using Rails’s built-in cache store methods. The company you are interviewing at may be using Memcached or Redis (or both!) to store the caching data. You can ask them about this to indicate more knowledge on the subject of caching and performance optimization. It is very likely that an interviewer will ask you to design and implement a few models to understand how well you understand the basics of Rails. They also want to find out what sorts of questions you ask about the problem, such as if particular details need to be added to the models.

Initializers contain configuration logic and are only run when the application is loaded. This means that the Rails server needs to be restarted if the initializers are changed. They are located in the / config / initializers directory.

What does “skinny controllers, skinny models” mean?

This checklist covers key features you should look for when choosing a skills testing platform. Time management – setting goals and managing time effectively is important in development. Developers should have the time-management skills to complete projects efficiently using Ruby on Rails. Technical skills are important, but don’t forget to assess candidates’ soft skills during the interview as well.

It also generates database migration files for each model it generates. Now it’s time to plunge into the world of the Rails framework. A qualified developer should be familiar with the Model-View-Controller approach to building applications. The series of Ruby on Rails interview questions for experienced programmers is divided into three groups.

This article will come in handy for you when you need to test a Ruby on Rails programmer but aren’t sure what questions to ask the Rails interviewee. You can consider this article as a guide for how to interview a Ruby on Rails programmer. We at RubyGarage want to share our knowledge about how to interview a Ruby on Rails developer. Since our main purpose is to sell great code, we require great coders. This is basically an important feature in Ruby which makes sure that the traffic is to be directed on one hand and the querying of the models can be done in a reliable manner. It also organizes and specifies data into a form that is suitable all over the domain.

key intermediate Ruby on Rails interview questions and answers

Engines give developers the ability to reuse application pieces complete with routes, view paths and models. The Rack web server interface and Metal allow one to write optimized pieces of code that route around Action Controller. Ruby on rails interview questions are where we discuss the basic understanding of programming processes and the ability to explain them. It tells a lot about the general level of the applicant. If the company you interview at is working on a complex Rails app, the chances are good that they use sub-classed ActiveRecord models.

• It is very likely that an interviewer will ask you to design and implement a few models to understand how well you understand the basics of Rails.
• The super function in Ruby is used to invoke the original method.
• Some of this is going to depend on the level of the role your are looking at.
• They may mention that developers can describe the changes they have made with the Ruby programming language and track the migrations they have already run with Active Record.
• These are models that use STI to store models in a single database table.

Not every “A” candidate worth hiring will be able to answer them all, nor does answering them all guarantee an “A” candidate. At the end of the day, hiring remains an art, a science — and a lot of work. A relatively complex query like this can instead be constructed https://wizardsdev.com/ in ActiveRecord pretty easily, thus turning a 3 database query operation into a single database query. The Rails console is a command line utility which runs Rails application from the command line. It helps you to walk through your application step-by-step.

Mention how you can create a controller for subject?

Many free Unix-like systems also support installation of Ruby on Rails and its dependencies through their native package management system. Ruby on Rails 3.0 has been designed to work with Ruby 1.8.7, Ruby 1.9.2, and JRuby 1.5.2+; earlier versions are not supported. Ruby on Rails is most commonly not connected to the Internet directly, but through some front-end web server. From 2008 onward, Passenger replaced Mongrel as the most-used web server for Ruby on Rails.

They should be able to explain that delete deletes a record, whereas destroy both deletes a record and executes any callbacks on the model. The “include” makes the module’s methods available to the instance of a class, while “extend” makes these methods available to the class itself. A single-quoted strings don’t process ASCII escape codes, and they don’t do string interpolation.

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

This is the last task that we give to the interviewee. We want to figure out if a Rails developer is able to use multiple technologies for both frontend and backend web development. An interviewee should have a good grasp of many frontend tools, including the JavaScript programming language, its frameworks and libraries. Proficient knowledge of a markup language and stylesheets is definitely a must.

You may be looking for several technical skills in addition to soft skills. An uninitialized global has the value of “nil” and it should raise a warning. Ruby Interpolation is the process of inserting a string into a literal.

First of all, it gives us a look into the developer’s line of thinking. Once a Ruby on Rails programmer gets the task, they should suggest some methods or means to resolve it. A pair programming task is very similar to a discussion, as our senior web developer helps the interviewee understand what solution might be not only workable, but best. Secondly, the pair programming tasks helps us determine a developer’s ability to work in a team. Below is an example of the tasks we might give during a Ruby on Rails interview.

Write the command to run the migration.

Why developer experience is the key to better software, straight from the… Connect and share knowledge within a single location that is structured and easy to search. In contrast, specifying the gem in the Gemfile without being tied to a specific version will simply install the latest version of the gem. A message containing the name of the method is sent to the object.

Please note that the above answer is only one of a few ways that it is possible to avoid incurring an “n+1” penalty, and each alternative will have its own caveats and corner cases. The above answer was selected to be Ruby on Rails developer job presented here since it requires the smallest change to the existing code and makes no assumptions regarding the reverse association of Comment to Post. All the three Rails servers feature automatic reloading of code.

What is the naming convention for variables?

Simply create a database on PostgreSQL for holding your data on the server. It would also be good if you create a basic skeleton or a clone of the application in the initial stage. Remember, always invite candidates to complete a skills test before you ask them to attend an interview to save time and improve hiring effectiveness. ActiveJob is a framework that developers use to declare jobs, such as clean-ups, billing charges, and mailings.