Ruby on Rails is one of the most widely used programming languages in the world. It has an abundance of useful features that help in the faster launching of web applications. A lot of new and experienced programmers like to learn this language because it has a good future ahead. Right preparation along with Ruby on Rails interview questions can definitely help you stand out you from other.
Ruby is being used by some of the top companies in the world for projects that require large transformation, or those that need a lot of complex functions, or that have heavy traffic. Thus, it is being used at a lot of places for a lot of different tasks.
Here are top 30 Ruby on Rails interview questions and answers to help you ace your interview. We have a list of interview questions for entry/junior level, mid-level, and seniors. Thus, no matter where you think you are on the expertise level, this blog has you covered.
This Ruby on Rails tutorial will not tell you what ROR is. In fact, this tutorial is for those who begin their success journey in the tech world with this incredible programming language. We have curated a list of some of the most often asked interview questions through all levels of the candidate's experience.
Here are a few Rails and Ruby interview questions that you might be asked when going for an entry-level position. As a junior, it is difficult to exactly pin which Ruby and Rails interview questions can be put forth by the hiring manager since you only have textual knowledge. But we have composed a list of ten important questions.
Answer. Ruby is an object-oriented programming language that has taken inspiration from Ada, Lisp, PERL, Basic, Eiffel, and Smalltalk. Rails is a framework that is used to build web applications.
Answer. ORM stands for Object-Relational-Mapping. Here Classes are mapped to tables in the DB whereas Objects are mapped to the rows in the table.
Answer. Ruby on Rails often finds itself being cited as slow, especially when compared to Golang or NodeJS' runtime speed.
Answer. Nil is a unique value that depicts the lack of any value. In Ruby, void or nothing is known as nil.
Answer. Rails Migration allows Ruby to alter database schema. This enables using a version control system to synchronize things with the actual code.
Answer. Rake is a widely used software task management tool used to group tasks, specify tasks, and describe dependencies in a namespace.
Answer. Rails has three main components namely model, view, and controller.
Answer. The Rails framework is based on two guiding principles.
Answer. There are three access modifiers in Ruby namely Public, Private, and Protected.
Answer. Rails active record is the ORM layer supplied with Rails.
Interviews will ask questions that are one step ahead when you go for an intermediate-level interview. Here are some mid level Ruby programming questions for you.
Answer. App/helpers - It refers to the helper's sub-directory that holds all helper classes involved in assisting the MVC classes.
App/controllers - The controller handles any web requests from the user. This subdirectory is where Rails get controller classes.
Answer. Delete is used to delete a record. Destroy, on the other hand, is used to both delete a record as well as execute callbacks on the model.
Answer. Load is used to execute code whereas require is used to import libraries.
Answer. Gems in Ruby on Rails refers to a package manager for this programming language. It offers a standard format to help distribute Ruby libraries and programs. It facilitates the developers in implementing various features without the need to code from scratch.
Answer. Scaffolding is an extremely useful feature that creates a basic structure of the application including controllers, routes, views, and models. It speeds up the development process by encouraging best practices and providing a consistent structure.
People also read- Ruby on Rails (ROR)- Benefits, Career Prospects, and Salaries
Answer. Scaffolding has a lot of benefits for the developers -
Answer. Helpers are modules offering automatically usable methods in the view. These modules offer shortcuts to many commonly used display codes. The aim is to simplify the view.
Answer. - Instance Variable begins with @.
Answer. Rails have a lot of positive points including-
Answer. Both gem and plugin are Ruby codes. However, gem is installed on a machine whereas a plugin is installed in the app folder. The former is available for all Ruby apps on the machine. The latter is available for that particular application.
Here is a list of a few senior level Ruby coding interview questions and answers. We hope a list of interview questions Ruby on Rails will help you crack an interview with your dream company. Let's begin!
Answer. A lot of Rails apps utilize Strong Params or Strong Parameters that help in strengthening the security of the data that is supplied via forms. This feature facilitates developers in deciding which parameters are accepted and then used in the controller.
Only the expected params are allowed and any potentially hazardous or superfluous params are filtered out. This feature comes in handy when the developer is using Active Model bulk assignments.
Answer. Rails callback is a method that can be called at certain specific moments throughout the life cycle of an object. These moments include events like creation, deletion, updation, or validation of an object.
Rails Observers, while quite similar to Callback, are employed when the method is not in direct association with the object lifecycle. These tend to live longer and can be attached or detached as per the requirement.
Answer. Garbage collection has an integral role to play in ROR.
Answer. Both Redirect and Render are methods. The former is used for issuing the error message if the page is not found or not issued to the browser. It sends a message to the browser to process the case and issue a new request. The latter is used for making the content. This method works best when the controller and the variables are set up properly.
Answer. Associations are used to create a connection between different models in an application. The three main types of associations are -
Answer. There are quite a lot of aspects on which Ruby on Rails differs from Python. Here they are -
Answer. Yes, Ruby is a highly flexible language as the user can easily and freely alter its parts as per their convenience. Ruby has done a good job at ensuring it does not restrict the coder. Any essential Ruby's part can be redefined or even removed as per the user's will.
Answer. Some key features of Ruby are -
Answer. A class library in Ruby is composed of a lot of domains including various domains, data types, thread programming, etc. these classes offer flexible capabilities at an upper level of abstraction, rendering the coders with the power to create impactful scripts that can be used in different problem domains. Domains with relevant class libraries include -
Answer. Text and string fields both hold information that can be freely written in. The major difference between String and Text lies in how many characters can be put in each.
The character limit of a string field is 255. Thus, it is best suited for storing data like name, address, etc.
The character limit of a text field is 30,000. Thus, it is best suited for storing data such as a comment box on a form.
Ruby on Rails is a leading programming language. However, there are many others that are even above it. So, why should you learn Ruby on Rails rather than going for it competitive languages like Python or JavaScript? Here is why this language is the best for you-
When you set your mind on becoming a Ruby on Rails developer, it is important to get trained from the right place and for that you can consider online Ruby on Rails training and course. Cracking the interview is one of the key steps of getting a job. This blog will help you find an answer to some of the most commonly asked questions in an interview.
Ans. Some of the most important soft skills to have include effective communication, problem solving, attention to detail, critical thinking, and time management.
Ans. Ruby is a good fit for commercial web applications whereas Python is a better fit for people who want to quickly develop websites.
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| Course Name | Batch Type | Details |
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