Updated July 1, 2023
Introduction to Rail Interview Questions and Answers
Rail is a web application framework that works with the Ruby programming language. David Heinemeier Hansson writes Ruby. Rail is a framework for building websites. Rails combine the Ruby programming language with HTML, CSS, and JavaScript to enable developers to create web applications on a web server. Ruby on Rail is an MVC framework. Rail is an extremely productive web application framework. Ruby on Rail is a powerful framework to describe your application. Rail is considered a server-side or back-end web application development platform. Rail is popular among web startups, significantly because of the pool of open-source software. So if you are looking for a Rail-related job, you must prepare for the 2023 Rail Interview Questions.
Below are the ten important 2023 Rail Interview Questions and answers frequently asked in an interview.
These questions are divided into two parts as follows:
Part 1 – Rail Interview Questions (Basic)
This first part covers basic Rail Interview Questions and Answers:
Q1. What is Ruby on Rail?
Answer:
- Ruby: Ruby is an object-oriented programming language inspired by PERL and PYTHON.
- Rail: It is a framework used for building a web application.
Ruby on Rail is an open-source full-stack web application framework in the Ruby Programming Language. Rail is capable of gathering information using pages and applications from the web server and can interact with a database and retrieve information from the database.
- Comparing Java frameworks, Rail empowers developers to create web applications with a significantly higher development speed, at least ten times faster.
- Configure your code with Database Schema.
- No compilation phase is required.
Q2. Explain the different advantages of using Ruby on Rail.
Answer:
The different advantages of using Ruby on Rail are as follows:
- Programmer Productivity and Consistent: The Rail framework on Ruby quickly carries an app from conception while developing framework/codes and into production at high speed. Developers adhere to standardized file storage and programming conventions to maintain a structured, readable project.
- Open-Source: Rail is an open-source web-based framework, and it is compatible with Linux. It means many open-source options are available when constructing your solution stack. There are many blogs, books, meetups, and conferences in the Rails world.
- Built-In Testing: Rail enables developers to use supporting code called harnesses, and if you expect to get a lot of users for your application, you should ensure that it can cope with all the visitors you’re hoping to attract.
- Metaprogramming: Rail makes writing easy, and some security features are built into the framework and enabled by default.
Q3. Why Ruby on Rail?
Answer:
There are lots of advantages to using Ruby on Rail:
- DRY Principal
- Convention over Configuration
- Gems and Plugins
- Scaffolding
- Pure OOP Concept
Q4. Explain functional testing in Ruby on Rail.
Answer:
These are the common Rail Interview Questions asked in an interview. Functional testing in Rail allows you to test the response of various actions contained in a controller. Using the Rail default-test library, mini-test, and functional tests, use a collection of assert statements that will tell your testing library to expect a specific response based on a control request passed.
Q5. Explain the role of garbage collection in Ruby on Rail.
Answer:
Garbage Collection removes pointer programs and inaccessible objects that remain after a program has been executed. It frees up memory for other processes, helping to optimize resource usage. Garbage collection also relieves the programmer from manually tracking dynamically created objects during runtime, saving significant time and effort.
Q6. How Rail implements Ajax?
Answer:
An Ajax-powered web page retrieves the web page from the new or changed server, unlike other web pages where you have to refresh the page to get the latest information.
Rail triggers an Ajax operation in the following ways:
- First Step: A call action will be created by a user or client and called considered a trigger is fired and on a call to action.
- Second Step: The web client or user uses JavaScript to send data via an XMLHttpRequest. It triggers a server and calls an action handler on the server.
- Third Step: Rail controller action receives the data on the server side and returns the corresponding HTML fragment to the client.
- The client receives the fragment and updates the view accordingly.
Part 2 – Rail Interview Questions (Advanced)
Let us now have a look at the advanced Rail Interview Questions:
Q7. What is ORM in Rail?
Answer:
ORM stands for Object-Relational Mapping, which implies that the classes you define are directly mapped to database tables, and objects correspond to individual rows within those tables.
Q8. What are the roles of the Rail Controller?
Answer:
The Rail controller is the logical center of the application. It facilitates the interaction between the users, views, and the model.
It also performs other activities like:
- The Rail Controller can route external requests to internal actions.
- It also manages sessions, creating the illusion of continuous interaction with our applications.
- The Rail Controller controls helper modules, enabling the extension of view templates without adding unnecessary code bulk.
- Additionally, Rail Controller demonstrates exceptional handling of URLs.
Q9. What are Ruby Gems?
Answer:
Ruby Gem is a software package commonly called a gem. Gem contains a packaged Ruby application or library. The Ruby Gems software allows you to download, install and manipulate gems on your system easily.
Q10. What are class libraries in Ruby?
Answer:
Class libraries in Ruby consist of various domains, such as data types, thread programming, multiple parts, etc.
Q11. What are the different naming conventions in Rail?
Answer:
The different naming conventions in Rail are:
- Variables: All letters are lowercase for declaring Variables and underscores separate words.
- Class and Module: Modules and Classes use Mixed Case and have no underscore; each word starts with an uppercase letter.
- Database Table: The database table name should have lowercase letters and an underscore between words, and all table names should be plural, such as invoice_items.
- Model: An unbroken Mixed Case represents it and always has a singular form with the table name.
- Controller: We represent controller class names in plural form, which means that the Orders Controller serves as the controller for the order table.
Q12. What are the roles of the sub-directory app/controllers and app/helpers?
Answer:
- App/controllers: It is a process in which the Controller handles web requests from the user or client. The controller sub-directory is where Rail looks to find their controller classes. The app/controllers subdirectory will keep track of all the controller classes for the app. Controllers will only handle web requests from the client or user.
- App/helpers: In this process, the sub-directory of the helper holds any helper classes, and developers use these classes to assist the view, model, and controller classes. Keeping helper classes in a separate subdirectory allows the model, view, and controller classes to remain lean and uncluttered.
Q13. What are the positive aspects of Rail?
Answer:
Rail provides many features:
- Meta-programming: Rail uses code generation, but for heavy lifting, it relies on meta-programming. Many programmers consider Ruby to be one of the best languages for meta-programming.
- Active Record: It saves an object to the database through Active Record Framework. The Rail version of Active Record identifies the column in a schema and automatically binds them to your domain objects using metaprogramming.
- Scaffolding: Rail can create scaffolding or temporary code automatically.
- Convention over Configuration: Unlike other development frameworks, Rail does not require many configurations if you follow the naming convention carefully.
- Three Environments: Rail has three default environments testing, development, and production.
- Built-in-testing: It supports code called harnesses and fixtures that make test cases to write and execute.
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