You can avoid all of this by changing the first line on the method to: posts = Post.includes(comments: ).all To make thing worse, the code is then making even more database requests to retrieve the Author of each Comment. Post objects from the database, but then the very next line will make an additional request for eachĮach Post to retrieve the corresponding Comment objects. class CommentsController < ApplicationControllerĬomments = lect do |comment|Ĭ = paramsĪnswer: This is a classic example of the notorious “n+1” bug. Find and fix the issue in the controller code written below. Ruby does the scaffolding automatically and the users are free to concentrate on the core development only from the first day of development. These codes help to build the application in a very quick and reliable manner and also, a close eye can be kept on the working of major components with this approach. Define scaffolding and what sort of advantages does Ruby offer when it comes to the same?Īnswer: During project development, the user has to frequently write codes in the early stage of development. The extensible nature and the true object-oriented approach have also contributed to its success and popularity. The users can always make sure of less coding and with a very limited number of bugs that one can easily avoid. It is easy to learn and can simply be trusted for coming out with large scale projects without having a dependency on third-party approaches. The Ruby on Rails has rich libraries which simply make sure that users get a diverse array of support without worrying about anything. Why and how did ROR become popular and successful?Īnswer: It is an open-source approach with license needs not very complex. It is a high-level programming language with a high scope in the present and being an object-oriented approach, developers consider it for building large scale projects. This makes it one of the trusted approaches. Also, there are various abilities of the Smalltalk, as well as Perl which is combined in the framework. It is a combination of Python and therefore it is easy to use. What exactly do you know about Ruby on Rails and how well can it be defined?Īnswer: It is a server-side framework for web applications that is widely regarded as one of the best in every aspect. You should go through each one of them and assess each question and answer. Here I present to you some very important and awesome Ruby on Rails interview questions of 2019. With the advent of remote work and freelancing, the number of employees in the workforce is expanding like anything. New fields such as digital marketing, web and app development, and graphic design, have flourished and taken over many traditional job profiles. This decade has witnessed a boom in technology. Include makes the module’s methods available to the instance of a class, whileĮxtend makes these methods available to the class itself.Technology is revolutionizing at a rapid pace. Stands for REpresentational State Transferĭelete delete DELETE What is request.xhr?Ī request.xhr tells the controller that the new Ajax request has come, It always return TRUE or FALSE How many Types of Relationships does a Model has?Īsset pipeline which enables proper organization of CSS and JavaScript What is the difference between include and extend Most developers release their libraries as gems. In general, since Rails works well with gems you will find that you would be mostly integrating with gem files and not plugins in general. Plugin is also ruby code but it is installed in the application folder and only available for that specific application. Rails, rake, json, rspec - are all examples of gems. It is installed on a machine and it’s available for all ruby applications running on that machine. What is the difference between a plugin and a gem?Ī gem is just ruby code. ORM tends for Object-Relationship-Model, it means that your Classes are mapped to table in the database, and Objects are directly mapped to the rows in the table. here users is your controller and new is your method, there must be a file in your views/users folder named, so once the submit button is pressed, User model or whatever defined in the rhtml form_for syntax, will be called and values will be stored into the database. There are lot of advantages of using Ruby on Rails(ROR)įor Example your url is something like this: Puts "At the instance level, self is #=>
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