If you’re an experienced Rails developer, you’ve already picked up the best practices and shortcuts that save you time and make your code more readable and maintainable. For those of you just getting started, this blog post will introduce you to some of the most useful Ruby on Rails magic codes and their functions. They are likely familiar to experienced developers but can be quite surprising to new developers! This article offers explanations of 10 of the most commonly used magic codes in Ruby on Rails and how they work.
1) Strongly Typed Models
In Ruby on Rails, everything is an object. This includes your models, which means that each attribute of your model must be an explicit type. For example, if you have a model for a user with an attribute for their name, you would specify that the name is a string.
You can do this by adding a line to your model like this:
class User < ActiveRecord::Base
2) A Practical Form Template Helper
Most people know that you can use form_for to generate a form in your view, but did you know that there’s a helper method specifically for creating input fields? It’s called f.input, and it takes care of a lot of the heavy lifting for you. For example, let’s say you want to create a text field for a user’s name. With f.input, all you need to do is this
3) Better Active Record Scopes
Active Record scopes are a great way to make your code more DRY and readable. But did you know that there are some magic codes that can make your scopes even more powerful? Check out these 10 tips to get the most out of your Active Record scopes!
Make sure you’re using the right syntax. Scopes should always start with a scope keyword, followed by the name of the scope. For example:
4) Create Active Record Observers
Active Record Observers are a great way to keep your code clean and organized. By setting up an Observer, you can ensure that your code will be automatically notified when certain events occur in your app. This can be a lifesaver when you’re dealing with large amounts of data. Here are 10 tips to get the most out of Active Record Observers
5) Notify Every Model When An Association Changes
Action Mailer with Devise is a great way to send HTML email templates. You can use it to send confirmation emails, password reset emails, and more. Plus, it’s easy to set up and use. Here are 10 tips to get the most out of Action Mailer with Devise
6) Kernel methods
Kernel methods are some of the most important methods in Ruby. They include methods like `puts` and `gets`. Did you know that there are actually a few other Kernel methods that can be really useful? Here are 10 of them -has_key – returns true if a given key is set in the given hash
-has_value – returns true if a given value is set in the given hash
-each – iterates over an array, yielding each item to its block one at a time
-reverse_each – iterates over an array, yielding each item to its block one at a time but yields items from last to first
-none? – tests whether none of its arguments evaluates to truthy ; for example, `nil?`, `false?`, and `0?` all return false unless any argument evaluates to true . For example, `nil?` will evaluate to false because it has no arguments. All the above work with blocks just as well as they do with normal argument lists:
-hash.size – returns size of a given hash
-hash2 = { a => 1, b => 2 } puts hash2.size # prints 2
7) Send Emails Without SMTP Configuration
If you want to send emails without having to set up an SMTP server, you can use the mail gem. This gem allows you to send emails from your Ruby on Rails application without having to configure an SMTP server. To use the mail gem, add it to your Gemfile and run bundle install. Then, you can use the following code to send an email send_mail(‘Name’, ‘Email Address’, ‘Subject’, ‘Message’)
And this code will create a text message:
send_text(‘Phone Number’, ‘Message’)
8) Manage Message Queues from Your Application with Sidekiq
If you’re using Sidekiq to manage message queues for your Ruby on Rails application, you may not know about some of the magic codes that Sidekiq provides. Here are 10 tips to help you get the most out of Sidekiq. – Create ActiveJob Jobs: ActiveJob is a gem that allows you to easily create jobs and process them asynchronously in the background without any polling by your web app or blocking the execution of subsequent jobs. ActiveJob jobs can be used with any queueing backend, including but not limited to Rescue, Delayed Job, Beanstalkd, and more. They provide a simple API and use Redis as their default storage engine. ActiveJob makes it easy to define different classes with different backends or priority levels if needed. However, you don’t need an ActiveJob at all!
9) Send HTML Email Templates Using Action Mailer with Devise
HTML email templates are a great way to spruce up your emails, and Action Mailer with Device makes it easy to send them. Just add a few lines of code to your Gemfile, and you’re good to go. Here’s how gem ‘devise’ gem ‘action mailer’ gem ‘action pack’, :require => false gem ‘sass-rails’, :require => false gem ‘sass-rails’, : In the config/application.RB file, specify that sass should be used for CSS stylesheets by adding this line: configure do config. assets.precompile += end Specify the extension for all stylesheet files as .scss in app/assets/stylesheets/. Finally, generate the application layout using the command rails generate scaffold blog post title: string text: text rake DB: migrate While you’re at it, don’t forget to create an emails folder in app/, which will contain all email-related files including style sheets and templates
10) Delete Records Instead of Undeleting Them in Development Mode
If you’re ever in development mode and accidentally delete a record, don’t sweat it! Instead of trying to undelete the record, you can simply run this code in your console: `Record. where(deleted_at: nil)`. This will give you an array of all the records that have been deleted. Next, make sure to add `@my_records = Record.where(deleted_at: nil)` to your model’s scope within app/models/mymodel.rb. Finally, create a method called `update` that is called whenever you want to update the data for one or more records in the database with something like this: @my_records .each do record
In place of my-record-id (used above), insert the ID number for any individual record you would like to update using its primary key from your table when creating the method call.
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