Use create_or_find_by to avoid race condition in Rails 6.0

It’s pretty common in Ruby on Rails to use find_or_create_by method when you want to create a new record if the record isn’t already existed:

> User.find_or_create_by(username: "sikachu")
  User Load…

How to use Module.prepend to override class method in Ruby

In Ruby 2.0, you can use Module.prepend in place of alias_method_chain to override a method in another class:

class A
  def say_hello
    puts "Hello from A"
  end
end

Private Attribute Accessor in Ruby is An Artifact from Other Languages

I’ve recently started seeing a trend of defining a private attr_accessor in Ruby code, and I honestly seeing them as an artifact from other programming languages. It’s something that followed the developer…

Squishing your multiline SQL queries for cleaner log output

When you are developing a complex Ruby on Rails application, you might need to write a few SQL queries and avoid using Active Record and ARel to improve your application’s throughput. It’s pretty common to see them written…

A Faster Way to Exit Pry Session

If you are using Pry in your project, you might run into situation where you are in a loop or having multiple binding.pry and so you have to use exit multiple times to get out from it.

Confirm current database connection in Rails console

Useful when you want to avoid running a big query on your main writer database.

If you are using Rails muti-database feature, it's quite useful to know if you…

Thailand Mobile Network Operators Do Not Care About Your Privacy