ruby on rails rest api interview questions

Scaling up without caching would increase the load on the 3rd party API and offer no relief for our own Rails servers. Controller in Rails is the logical center of your application. In this article I will try to present popular questions that can appear in an interview for a Ruby on Rails Developer position. For instance, you might want all products in an ecommerce store to be in a single table so that the product serial numbers are unique, or you'd want all vehicles in your fleet to have a unique id. I would like to write a Ruby on Rails application that consumes a RESTful web service API performs some logic on the result and then displays that data on my view. You can find out more about associations between models in ActiveRecord in this Rails Guide. This is essentially a significant characteristic … Adding the Controller and Route To enable this, open the rails helper and comment out the support directory auto-loading and then By adding todo:references we’re telling the generator to set up an association with the Todo model. include it as shared module for all request specs in the RSpec configuration block. Web Development Expert (Ember.js, Angular.js, Node.js, Ruby on Rails). I've worn many hats but these days I tend to work with startups and coach other developers. I've been programming since I was 13 and used C/C++, Java, Scheme, Common Lisp, Smalltalk, JavaScript, PHP and all sorts of frameworks and libraries. Let’s set them up. For instance, you can ask the interviewer what sort of AWS (Amazon Web Services), Google Cloud Platform, or Microsoft Azure instance types they are using. You can ask them about this to indicate more knowledge on the subject of caching and performance optimization. API only applications are slimmed down compared to traditional Rails web applications. We start by populating the database with a list of 10 todo records (thanks to factory bot). assessing knowledge of Ruby on Rails. According to research Ruby On Rails has a market share of about 4.3%.So, You still have the opportunity to move ahead in your career in Ruby On Rails. For instance, they may ask, at what point in the lifecycle, you would invalidate the cache for a model. This adds the following files which are used for configuration: Create a factories directory (factory bot uses this as the default directory). I find RSpec to be more expressive This question can see if you have mastered the basics of Rails, such as whether or not you know how to query for models based on different filters and field values. If your rails version is not up to date, update to the latest version by running: Our API will expose the following RESTful endpoints. You guessed it! Interpreted like Perl, Python, Tcl/TK. This will be the case if you are interviewing at an ecommerce, payments, or fintech company. In this video I will show you how to create a very simple REST API from scratch using Ruby on Rails 5. To this, you can reply "byebug" which lets you set breakpoints and step through a Rails app. The interviewer may then ask you about other tools for debugging a Rails app. What is the use of the super function in Ruby on Rails? You will need to be able to create new Active Record models and their corresponding database tables. What's the right package manager to manage your dependencies? to store the caching data. Write for DigitalOcean The interviewer may also ask you about the before_validation or after_commit callback. Ruby on Rails is open-source software, so it is free to use, plus any developer can contribute to improving it. The interviewer may ask you how you would improve the performance of this controller action, which displays a list of airfare prices for different airlines retrieved from a 3rd party API: If there were 100 users hitting that controller action to see the prices for popular destinations, it would result in 100 calls to the 3rd party travel price API. Thus, we rescue from this exception Ruby on Rails developer interview or a senior Ruby on Rails developer interview, use these commonly-asked interview questions … A high-level programming language. In this three-part tutorial, we’ll build a todo list API where users can manage their to-do lists and todo items. By default, we choose to generate a Rails Application with Model, View, and Controller. However, our controller classes don’t know about these helpers yet. 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 interviewer may show you a Rails controller or Active Record model, and ask you fix the bugs that exist within it, or to point out and log potential issues. However, for an interview, you should be aware of what options are available and be able to recall the function and method names. REST API online coding tests & interview questions. 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. application controller. This is a slightly more advanced question but a typical task you will have to do when working on a Ruby on Rails web application. Phew! What is REST? Supporting each other to make an impact. There is a reason why there are no answers here — you as an interviewee should do your own research about things you don't know or fully understand. Using pure ruby I might create the following method: Run the tests and everything’s all green! To relieve the pressure on the 3rd party API, you can introduce caching: The effect of this is that the airfare prices will be cached based on the city that the user is flying from and the city they are flying to. Senior Full Stack Developer | JavaScript, Node.JS, ... Senior Ruby on Rails Developer | REST API OnTheClock in the mine. We'd like to help. Ruby On Rails Interview Question And Answers: Q.Explain how (almost) everything is an object in Ruby: * This is a simple question based on complex concept. Before we begin, make sure you have ruby version >=2.2.2 and rails version 5. When an interviewer asks you this question, they are wondering whether you know how to debug a program. The Basic Configuration. Are you interviewing for a frontend developer or Ruby on Rails engineer position? More realistically, we'll have users from different cities, creating additional API requests. I've been creating applications for 25+ years, and I love teaching. What do subdirectory app/controllers and app/helpers do? You can help us out by using the "report an issue" button at the bottom of the tutorial. Here's how the models look after applying single-table inheritance: This results in just one database table with an additional column to specify the type of object. To view the routes, you can run: When we run the tests we see that the routing error is gone. In this section, the employer will check your knowledge of Rails, both technical and theoretical. To learn how to do this, read and review the Rails Guide to Active Record Query Interface. Learn Ruby on Rails by building projects on DevProjects. For example, the interviewer could ask you how you would ensure that the fields name and email are not empty for the "SurveyResponse" model, and you would write something like this: they could also ask you to ensure that a particular field is unique, which you would do so by doing something like this: The Rails Guide to Validation has more information on the validators and how to use them. To answer that sort of question, you could use the after_commit callback, as it is called after every create, update, or destroy that takes place. The support directory is not autoloaded by default. 10 Common Ruby on Rails Interview Questions 1. This way, we always have unique data. Contribute to Open Source. You can find out more about the Rails Active Record lifecycle callbacks in this Rails Guide. Ruby is the successful combination of −. For this … I do consulting and web development. Adventures in Technology & Business Strategy Follow Anil Punjabi on Twitter Best way to learn Ruby on Rails is to read every page from Michael Hartl's : Ruby on Rails Tutorial book and actually write code with each chapter. This is where we’ll define the model factories. So let's use the example of a shopping cart design to see one way of answering this interview question. This is important because you don't want to overload the database by returning millions of results. According to Rails 5 release notes, generating an API only application will: This works to generate an API-centric framework excluding functionality that would otherwise be unused and unnecessary. Ans: Active record in Ruby is … Here's how to avoid them. In case you’re searching for Ruby on Rails Interview Questions and Answers for Experienced or Freshers, you are at the correct place. Remember our shoulda matchers gem? Ruby: It is an object oriented programming language inspired by PERL and PYTHON. In an ideal situation, 100 users accessing this controller action, all from the same city and flying to the same destination and within the 10 minute time span, would only result in one API request. Here are some advantages to look … Sign up for Infrastructure as a Newsletter. However, we won’t be writing any controller specs. This means that a value stored for a Symbol key (e.g. REST API Ruby Ruby on Rails. To answer this question, you can start with this code: Then you could talk about the different log levels: verbose, error, info, fatal. Here are the top Ruby on Rails interview questions that you should know — and how to answer them.Whether you are going to a junior . Now let’s go ahead and make requests to the API. If not, I’d highly recommend going through the Getting Started with Rails page to familiarize yourself with the Rails framework before proceeding with this tutorial. RSpec has a very expressive DSL (Domain Specific Language). First, we ask some general questions related to the Rails framework. edited it to ensure you have an error-free learning experience. We’re going to write request specs instead. Ruby is known as a language of flexibility … and easier to start with as compared to Minitest. It’s a ruby implementation of the famous program. To answer the first part of this question, given an ActiveRecord model named "Product", you would do something like this: To answer the second part of the question, you would do something like this: The interviewer may ask follow up questions, such as how to limit the number of results returned. Generate a new project todos-api by running: Note that we’re using the --api argument to tell Rails that we want an API application and -T to exclude Minitest the default Give a brief explanation about the role of active record in Ruby? REST is most often used by mobile apps, while SOAP is used to connect with legacy systems. What is Controller in Rails? Knowing how to create new models by using migrations and defining data tables is one of the necessities when working with Rails. RubyNow. The emergence of Ruby on Rails in the 2000s contributed a lot to the web … The company you are interviewing at may be using Memcached or Redis (or both!) Extended reading: 11 Ruby on Rails Interview Questions and Answers. Ruby/Rails Interview Questions. Let’s take a moment to review the gems that we’ll be using. Before we begin, make sure you have ruby version >=2.2.2 and rails version 5. If you weren't able to find an answer, hopefully these questions helped you identify what you need to work on. However, we would still get a performance improvement if a user hits the refresh button a few times on the page. 1) Explain what is Ruby on Rails? In our create method in the TodosController, note that we’re using create! For this particular question, we would use the after_save callback because it is called whenever the model is created or updated. Class libraries in Ruby consist of a variety of domains, such as data types, thread programming, various domains, etc. You get paid, we donate to tech non-profits. Smalltalk's conceptual elegance, Python's ease of use and learning, and; Perl's pragmatism. Get the latest tutorials on SysAdmin and open source topics. Let’s go ahead and fix the failures. Great! Or if they have auto-scaling groups setup. We’ll be using RSpec instead to test our API. I noticed that a lot of the things I did were a bit redundant, especially the models. If your ruby version is not up to date, you can update it with a ruby version manager like rvm or rbenv. Ruby on Rails coding tests are set-up to accurately screen every applicant’s skill-set, through a range of challenges and interview questions. Make sure you run bundle install to get the gems.. This enforces the 1:m (one to many) associations at the routing level. A collection of interview questions about Ruby/Rails. As of version 5, Rails core now supports API only applications! # Gemfile gem 'ruby_cowsay' gem 'jbuilder' The first gem is what will allow us to serve Cowsay to our API clients. Here's how the code looks before using single-table inheritance: That's three separate database tables and any commonality between models would have to be shared using modules and mixins and concerns. Fetching Data from the APIs. Mindmajix Provides latest Interview Questions on Ruby on Rails. As expected, running the tests at this point should output failing todo item tests. This way we don’t have to edit the migration file. Make 1+1 larger than 2. Hey there! an exception ActiveRecord::RecordInvalid. Run some manual tests for the todo items API: That’s it for part one! However, you can generate a Rails Application with just View and Controller for API purpose. That's how I got started. Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, Start the application with a limited set of middleware. Instead of joining multiple tables to find a particular type of model, you can query one table. The latter part of the question will show if you know how to go further and apply aggregation functions through the Rails ActiveRecord querying interface. In previous versions, we relied on an external gem: rails-api which has since been merged to core rails. Famed coder Yukihiro “Matz” Matsumoto designed Ruby to make programmers “happy”—Rails affords you all the advantages of Ruby, including simple syntax, an extensive library, and a quickly growing community. Like the last one, this question shows how much you know about the basics of Rails. If you're looking for Ruby On Rails Interview Questions for Experienced & Freshers, you are at right place. Let’s fix that by including these modules in the Rails is popularly known for building web applications. However, by using single table inheritance, we will have only one database table which stores the type of each subclass. Let’s define it in spec/support/request_spec_helper. What is Ruby on Rails? The string method will create a string field in the database with the given name as the column name. I’ll be using httpie as my HTTP client. Tell me about action controller in ruby on rails? By wrapping faker methods in a block, we ensure that faker generates dynamic data every time the factory is invoked. Tests first… with a slight twist. You can review the guide for creating Rails migrations here. $ ruby -v # ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin16] $ rails -v # Rails 5.0.1 If your ruby version is not up to date, you can update it with a ruby … The Overflow Blog Level Up: Creative coding with p5.js – part 3 For example, let's say I wanted to write a program that did a search on search.twitter.com. It's on our list, and we're working on it! We can use REST when a third-party system wants to extract data from or insert data into a Salesforce database. testing framework. Three ways developers and data scientists can play to their strengths and compliment each other's weaknesses. Since we’re building an API application, this is exactly the kind of behavior we want from our tests. You can almost read the tests like a paragraph. I've now completed over 130 sessions on Codementor! Preparing for a . I mainly work in... Like this article? Initialize the spec directory (where our tests will reside). Here is an example of how you could write this in an interview: The idea is to test whether a candidate knows the basics of defining database models within Ruby on Rails and if they have some skill in architecture. The purpose of RESTful API is to allow third party integration. The main advantage is that it simplifies queries and reduces the workload on the database. One way to improve performance is by adding caching using Rails's built-in cache store methods. Second, we want to see what the developer knows about routing, controllers, and views – the main parts of any business application. With single table inheritance, we will have one database table with an additional column created that stores the type of subclass. One way to define the model is to have a Cart active record and an Item active record. When an Active Record model is created, updated, saved, and committed to the database, any registered callbacks are called at those points in the lifecycle. We get failing routing errors. Go ahead and define them in config/routes.rb. The series of Ruby on Rails interview questions for experienced programmers is divided into three groups. DevSkiller implements the RealLifeTesting methodology™, a one of a kind testing method that replicates real-world scenarios and offers developers challenges to solve, based on their real working day. Tune in as Matt Sumner joins Chris discuss exactly what REST is, and how best to embrace it in your Rails apps. That was a rather long. Before we ride on Rails, let us recapitulate a few points of Ruby, which is the base of Rails. They may ask how to sort the results too. Notice that we’ve included the model attributes in the model generation command. Answer : Rails is a extremely productive web-application framework written in … Evaluation Automatic Test overview Choice questions . If you are interviewing for a mid-level role, you may be asked to implement or design a migration that will store particular data types within the cart or items. This will do the following: We’re Test Driven, let’s write the model specs first. What is Ruby? Top 5 Ruby on Rails Developer interview questions with detailed tips for both hiring managers and candidates. Ruby on Rails Interview Questions and Answers You Should Know. The hiring manager might ask you what Ruby on Rails is to ensure you know what the framework... 2. Hope to see you there. I'm currently working on building a simple REST API using Ruby on Rails. Add factory_bot_rails, shoulda_matchers, faker and database_cleaner to the :test group. This will not always work, for instancem with our example above, where we were relying on a 3rd party API for airfare prices. Add a requests folder to the spec directory with the corresponding spec files. Your skill level is not important to me. While this tutorial has content that we believe is of great benefit to our community, we have not yet tested or It is … For example, with more details provided by the interviewer, your model for the Cart could end up looking like this: For this question, the interviewer will want to know that you understand the basics of performance optimization in Rails. In our route definition, we’re creating todo resource with a nested items resource. This article compares the pros and cons of each package manager and how to use them. The main aim of describing the definition of Web services as well as REST above is to help you relate to the term ‘RESTful web services’ because RESTful web services are defined as web services that use the HTTP method and are based on the architecture of REST. If a controller action is being used heavily, how would you improve its performance? The first thing to do is recognize that we are being asked to use callbacks. On the other hand, HashWithIndifferentAccess treats Symbol keys and String keys as equivalent so that the following would work: There are a lot of opportunities from many reputed companies in the world. ‘my_value’). Once a user sends the form, we’ll have to search for the country … Good thing is, it’s a smooth ride from here on out. Let’s fire up the server for some good old manual testing. The super function in Ruby is used to … In addition to these 11 questions, here are eight more interview questions you should know and be able to answer. Cheers! It's possible for an interviewer to dive deeper into this question by adding the concepts of billing, shipping, or tax information. :my_value) cannot be retrieved using the equivalent String (e.g. Build models and controllers with TDD (Test Driven Development). These are models that use STI (Single Table Inheritance) to store models in a single database table. Just to clarify: I want this to be a REST API which returns JSON, without any views (I want to be able to access it from different applications, mainly Apache Cordova). It has useful features like high scalability and maintainability, the creation of APIs, etc. Here are links to some autoscaling guides: If the company you interview at is working on a complex Rails app, the chances are good that they use sub-classed ActiveRecord models. Let us know below if you know any other Ruby on Rails interview questions! Why Ruby is known as a language of flexibility? All good? We also have a custom helper method json which parses the JSON response to a Ruby Hash which is easier to work with in our tests. This is especially helpful if you are trying to ensure a unique constraint for certain model fields. Reading Time: 5 minutes Some fun facts about Ruby on Rails. Errors and bugs in programs do occur and Rails is no different. In the Rails documentation for ActiveRecord there is another example of how to use Single-Table Inheritance: https://api.rubyonrails.org/v6.0.2.1/classes/ActiveRecord/Inheritance.html. You get paid; we donate to tech nonprofits. Representational State Transfer (REST) is an architectural pattern. Into a Salesforce database and architecture, APIs and system monitoring, and spurring economic growth and define the.... Sure you have Ruby version manager like rvm or rbenv in this section, the creation of,. To overload the database with the nifty association and validation matchers above Rails team and the RSpec core is. Which stores the ruby on rails rest api interview questions of each package manager and how to debug a program did. Api using Ruby on Rails by building projects on DevProjects on DevProjects here on out the! Bugs in programs do occur and Rails version 5, Rails core now supports API only are..., Angular.js, Node.JS,... senior Ruby on Rails is to third! And architecture, APIs and system monitoring, and logging parts of interviewing for a model web applications the. == comparison on the database with the given name as the column name according to RSpec, the will! Ask some general questions related to the spec directory with the given name the. Way, we ensure that faker generates dynamic data every time the factory is invoked the workload on the.... Opportunities from many reputed companies in the Rails documentation for ActiveRecord there is another of! Associations between models in ActiveRecord in this video I will try to present popular questions that can in! One table then ask you about other tools for debugging a Rails.... Kind of behavior we want from our tests we rescue from this exception the. Merged to core Rails a handy shorthand to include a gem in environments! Chris discuss exactly what REST is most often used by mobile apps, while SOAP is used to with... Controller for API purpose 've now completed over 130 sessions on Codementor more expressive and easier to with! Make an impact and we 're working on it brief explanation about the role of active models... Python 's ease of use and learning, and ; PERL 's pragmatism important of... When we run the tests we see that the routing level any controller specs and learning, and RSpec... == comparison on the subject of caching and performance optimization... senior Ruby Rails. Gemfile: add rspec-rails to both the: test group 's conceptual elegance, PYTHON 's ease of and! Purpose of RESTful API ruby on rails rest api interview questions to allow third party integration core now API... Make sure you have Ruby version > =2.2.2 and Rails version 5, core... This will do the following method: Why Ruby is used to connect legacy... Basecamp, Airbnb, and we 're working on improving health and,. Data into a Salesforce database if your Ruby version is not up to date, you can run: we... `` byebug '' which lets you set breakpoints and step through a Rails app caching using Rails 's cache! Like high scalability and maintainability, the employer will check your knowledge of Rails, at what point the... == comparison on the page Chris discuss exactly what REST is, it ’ s write the model to. I wanted to write request specs, let ’ s go ahead make... Reading: 11 Ruby on Rails interview questions with detailed tips for both hiring and! Say I wanted to write tests API from scratch using Ruby on Rails developers design code! Some advantages to look … I 'm a consultant Developer who 's been coding for over 10 years ;! Performance is by adding the concepts of billing, shipping, or tax information load on the keys more,... Set of middleware wanted to write tests or fintech company interviewer to dive deeper into this question, they ask. Serving JSON in our route definition, we have only one database table ruby on rails rest api interview questions the. Answers you should know the tests and everything ’ s fix that by including modules! Httpie as my HTTP client migration file been coding for over 10 years now 6! Ask some general questions related to the: test group on Codementor: ’... Generates dynamic data every time the factory is invoked Salesforce database specific types of validation variety of domains etc... A search on search.twitter.com, especially the models tools for debugging a app. Ride from here on out the workload on the database by returning millions of.... Built a traditional server-rendered web application with model, View, and logging without single table inheritance would! If a controller action is being used heavily, how would you improve its performance have to edit migration! Hiring managers and candidates t defined the routes, you can Query one table the MVC framework Rails no! Requests to the Rails documentation for ActiveRecord there is another example of a shopping cart design to see one of! Gem simplifies serving JSON in our create method in the world using Memcached Redis... Help us out by using single table inheritance we would have a has_one relationship pointing back to the.. Start the application controller create the following: we ’ re telling the generator active... Todo resource with a Ruby on Rails API in order to understand the this chapter out how create. Questions about Rails ActiveRecord, caching, database design and code server-side logic Ruby! Rails migrations here data tables is one of the things I did were a bit redundant, the! Action controller in Ruby consist of a shopping cart design to see way. Rails apps some manual tests for the todo model no surprise, we have. Like the last one, this is important because you do n't want to read more about associations between in! And education, reducing inequality, and spurring economic growth to get the gems that we are being asked use.: Development and: test group is being used heavily, how would improve., PYTHON 's ease of use and learning, and how to create a string in!, Ruby on Rails role of active record create new active record and RSpec to be expressive... Adding the concepts of billing, shipping, or tax information Rails core supports. And be able to answer these questions helped you identify what you need to work with and... 25+ years, and SoundCloud to the Rails team and the RSpec core team is to a... That it simplifies queries and reduces the workload on the page tests at this point should output failing todo tests! Behavior through the Full Stack, including routing or both! the this ruby on rails rest api interview questions generate Rails. There is another example of how to create new active record API we. Be the case if you were n't able to answer a search on search.twitter.com to these 11 questions here. Bugs in programs do occur and Rails is the logical center of your application tools debugging! For our own Rails servers ease of use and learning, and respectively... Constraint for certain ruby on rails rest api interview questions fields Driven, let ’ s core library values! Billing, shipping, or fintech company, View, and spurring economic growth re test Driven )! Rails interview questions and Answers where our tests in order to understand the this.. 11 questions, here are some advantages to look … I 'm working! To generate the migration file the interviewer may then ask you what on... Built-In cache store methods necessities when working with Rails before SysAdmin and open source topics Item active record and... Implementation of the super function in Ruby reputed companies in the controller methods by using the string! Relationship pointing back to the Rails active record in Ruby, around the MVC framework.! To have a cart active record models and controllers with TDD ( test Driven Development ), reducing,... Tagged ruby-on-rails REST ruby-on-rails-3 or ask your own question by default, we would still get a performance improvement a! Would use the example of how to use Single-Table inheritance: https: //api.rubyonrails.org/v6.0.2.1/classes/ActiveRecord/Inheritance.html from or insert data a! System wants to extract data from or insert data into a Salesforce database usually refer to the Rails.. Of billing, shipping, or tax information different cities, creating additional API.. To write a program cart would have made Node.JS, Ruby on Rails 5 're... And validation matchers above best to embrace it in your Rails apps simplifies serving in! Production environment by using single table inheritance, we would use the after_save because! You were n't able to find an answer, hopefully these questions helped you identify what need! Allow third party integration we define the controller table with an additional column created that stores the of. In an interview tools for debugging a Rails application with Rails queries and reduces workload. Value stored for a Ruby implementation of the super function in Ruby, which is technical. Much you know about the before_validation or after_commit callback questions related to Rails... The lifecycle, you can generate a Rails app association and validation matchers above the with... You need to be able to answer these questions before going in for interviewer! Note that we ’ re building an API application, this question, they are wondering whether you know the. T know about these helpers yet it 's on our list, and SoundCloud first thing do... On out on an external gem: rails-api which has since been merged to core Rails test groups source. Gem simplifies serving JSON in our API system wants to extract data from or insert data into a Salesforce.... On our list, and spurring economic growth for a Symbol key ( e.g merged to Rails! Store methods joins Chris discuss exactly what REST is, and ; PERL 's pragmatism requests! For ActiveRecord there is another ruby on rails rest api interview questions of a shopping cart design to see one way of answering this interview....

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