Ruby 2.3 has introduced safe navigation operator.
Safe navigation operator returns nil
if a method is called
on a nil object.
if a method is called on a nil object,
it throws an error as given below.
In Rails, sometimes we need to iterate over all the records from a model.
To achieve this people prefer to use all.each on a model.
This can lead to usage of memory if there are millions (huge number of) records in the table.
I was working on a problem to check on a large array of integers to check whether it is a part of another array or not.
Both the arrays have unique elements, but not in sorted order. So there are multiple ways possible to this, but I was not sure that
which approach is most efficient. I searched for this but couldn’t come across anything valuable. Then I decided to benchmark whole approach by my self.
Today, I was looking at the internal working of a gem.
While working on the same,
I came across the code where the network calls were being made
and it had to check if the response params has some set of keys.
HTTPs load balancer
Google Cloud Platform
we need to create an SSL certificate beforehand.
Letsencrypt can be used to create an SSL certificate
free of cost.
The SSL certificate provided by Letsencrypt
is valid for 3 months.
In this article,
we will learn how to setup HTTPs load balancing
using Letsencrypt certificate for a Ruby on Rails application
on Google Cloud Platform.
In traditional programming practice, I/O operations happen synchronously. The
main thread will be blocked until I/O operation gets completed and CPU remains
idle for the time I/O operation is getting completed. Consider the following
example where CPU is blocked until query execution completed.
in creating User Authentication layer
for the Ruby on Rails applications.
The other day, I was taking a session on
to resolve a query from a Ruby on Rails developer.
The developer had added an enum attribute role on the users table.
The query was
how to update custom attribute added
to users table generated by devise gem.
[Creator of Rails] has recently announced
as a built in support
for file uploads.
Active Storage is targeted to be released with Rails 5.2.
The development has been started on Github in
It is started as a separate repository for now.
This ActiveStorage is eventually planned to be merged in Rails repository.
Rails 5 has improved the way query was done on database
when pluck was called on a model.
Before Rails 5,
when pluck was called,
it used to query database even if the activerecord collection is queried before.
There are some posts explaining don’t pluck
In this post we will discuss how Rails 5 has improved the way pluck used to
In Rails, exception_notification is popular gem used for Exception Notification to email.
Slack is a new tool which is very popular among teams for collaboration.
This article will help us understand the way to configure exception_notifier gem
to send notifications to your Slack channel from Ruby on Rails application.
Google has released Material UI.
Since then, Material UI is getting a lot of attraction from Designers
Developers around the world.
This article will help you create Material UI application in Rails.
In this article we will learn how to integrate slack with Rails applications using slack-notifier. Slack is a messaging app for teams. Slack comes with integration services with tools such as Github, Airbrake, Jenkins, Bitbucket and there are many. You can visit Slack services page for full details.
Ruby on Rails developers use rescue nil to get default value
if particular expression evaluation fails.
rescue nil is bad, very bad in terms of performance.
We will learn why it’s bad and what should be used in order to achieve the same result