ruby on railsを使ってユーザーがセットリストを投稿できる機能とそれに対していいねができるような機能を実装しようとしています。投稿に対していいねがついているかついていないかの判別するメソッドをモデルに定義しているのですが、部分テンプレートから読み込もうとするとNo method errorとなってしまいます。
ActionView::Template::Error (undefined method `liked_by?' for nil:NilClass): 1: - if user_signed_in? 2: - if set_list.liked_by?(current_user) 3: = link_to event_set_list_likes_path(event, set_list), method: :delete, remote: true do 4: .like__box 5: .heart__mark__unregistered
class SetList < ApplicationRecord belongs_to :event, optional: true belongs_to :user has_many :likes, dependent: :destroy has_many :comments, dependent: :destroy validates :artist, :first_song, presence: true validates :artist, uniqueness: true def liked_by?(user) likes.where(user_id: user.id).exists? end end
Ruby on Rails is a development tool that offers Web & Mobile App Developers a structure for all the codes they write resulting in time-saving with all the common repetitive tasks during the development stage.
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Due to the inability to generate a well-defined way to authenticate rails API, I have sourced out this information in order to help me and you have a way of authenticating our rails API token. This tutorial would be based on the latest version (6.0) of Ruby on Rails.
In getting this set up as well as up and doing, the few steps through which the processes would be implemented are listed below:
We would need to, first of all, generate a new rails app as we embark on the journey. Follow the example given below:
$ rails new sample-app --api -d=postgresql -T $ cd sample-app $ rails db:create $ rails db:migrate
In order to gain access to the API, we would need to uncomment or remove Cors gems as that serves as permission into gaining access to the API
After uncommented the gem ‘rack-cors’ then we run this command below
$ bundle install
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Rails is a server-side web application development framework written in the Ruby programming language. Its emergence in 2005 has influenced and impacted web application development to a vast range, including but not limited to seamless database tables, migrations, and scaffolding of views. In the simplest understanding, Rails is a highly productive and intuitive software developer.
Websites and applications of any complexity can be achieved with Ruby on Rails. The software is designed to perceive the needs of ruby on rails developers and encourage them with the best way out. It is designed to allow developers to write lesser code while spiking productivity much more than any other framework or language. Ruby on Rails rapid application development offers everyday web development tasks easier and uniquely out-of-the-box, both with the same effectiveness.
The Ruby on Rails framework is based on two philosophies:
Some of the commonly known websites built by the Ruby on Rails software developers are Instacart, Scribd, Shopify, Github, ConvertKit, Soundcloud, GoodReads, Airbnb. It finds its application in Sa-as Solutions, Social Networking Platforms, Dating websites, Stock Exchange Platforms, etc.
There is a large community that is dedicated to Ruby on Rails that keeps it up-to-date and indeed encourages its family of developers to continue using it. They make sure the benefits are soaring with every update they make.
The community is committed to developing several ready-to-use code packages, commonly known as gems, for its users. They discuss and announce new project launches, help each other with queries, and engage in framework discussions and betterment. While Ruby on Rails helps developers in rapid application development, it also connects and grows businesses together.
To talk about scalability, we indicate the ability to grow and manage more and more user requests per minute (RPM). However, this depends on the architecture rather than the framework. The right architecture of Ruby on Rails web application development allows it to write bulky codes and programs as compared to early-stage difficulties with scalability.
It uses the Representational State Transfer (REST) architecture. This will enable Rails to create efficient web applications based on Rails 6, launched last year in 2020, which addresses most scalability issues. The portable components are agile and help in a better understanding of new requirements and needful adaptations for any business. The framework and architecture allow both vertical and horizontal scalability.
Fast Application Development and Cost Effectiveness
Ruby on Rails is lucid, logical, and has lean code requirements, thereby cutting down redundancy and improving the overall development speed. Lesser amount of code is proportional to lesser time investment with optimal results. The more time it takes for development, the more expensive it becomes for the end customers.
Considering the ready-made code modules/packages (gems) available, Ruby on Rails development company will less time and money are spent creating and modifying Rails websites and applications. Another advantage that has made Ruby on Rails super attractive for startups is its use of Model-View-Controller (MVC) architecture. It has a component separation scheme that speeds up the web development process and fixes any errors that occur.
Rails framework and the Ruby on Rails community put in a lot of efforts for data protection and security of its customer base. It is also one of the efficient frameworks for developing database-backed applications.
The developers at Ruby on Rails cover many aspects of cybersecurity, including encryptions of passwords, credit card information, and users’ personal database. Special measures are taken to prevent the framework from SQL injections and XSS attacks.
Ruby on Rails simplifies the daily operations and lowers the cost of enterprise app developments. The prominent features include data management, seamless updating of applications, easy and efficient code development, and high scalability, as discussed above.
Ruby on Rails enterprise application development is preferred by companies and is slightly cost-intensive. It can be easily integrated with third-party apps like Oracle Business, Oracle, Windows services, and others. Ruby enterprise app development allows the developers and programmers to solve the problems at the root level, given its transparency.
Checkout Blog on Django vs Ruby on Rails Comparison
There are several reasons to prefer Ruby on Rails discussed above and extend further to early detection of errors, reduced time to market, and easy adaptation for API developments. It makes web programming much easier and simplifies website building of any complexity. Its flexibility and acceptance among new developers and programmers make it the perfect, one-stop choice for software application development company in 2021.
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