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Nam Vo Website
I developed this website to
share my knowledge and satisfy my coding passion
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Moments Captured
Recent moments
Capturing the beauty of everyday life through my lens.
The boy and his dog
Ta Dung Lake - Dak Nong
Ha Long Bay from above
Ky Dai - Hue
Tea plantation - Bao Loc
Train Street - Ha Noi
Reading room
Insightful articles, tutorials, and my coding journey.
LATEST BLOGS
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Understand clientHeight, offsetHeight, scrollHeight and scrollTop
When working with the DOM, there are four properties that developers often confuse: clientHeight, offsetHeight, scrollHeight, and scrollTopThey all sound similar, but each one measures a different aspect of an element. In this post, we’ll visualize w...
2026-07-06 21:47:00 +0700
· 2 mins read
Software Engineer
Software Engineer
Frontend
Frontend
Store Sensitive Data in Rails
attr_encrypted used to be the go-to solution for encryption in Rails applications. However, Rails 7 introduced Active Record Encryption, making application-level encryption a first-class feature. Adding encryption is now as simple as:// language: rub...
2026-06-08 20:05:25 +0700
· 5 mins read
Software Engineer
Software Engineer
Ruby on Rails
Ruby on Rails
Common Mistakes When Using Sidekiq
Sidekiq is a popular background job processing library for Ruby that allows you to offload time-consuming tasks from your main application thread. While Sidekiq can significantly improve the performance and responsiveness of your application, it's es...
Ruby on Rails
Ruby on Rails
2024-08-27 21:25:30 +0700
·
3 mins read
Rails 7.2+: How to show all model attributes in Rails Console
With the release of Rails 7.2, a new change was introduced to the way ActiveRecord models are inspected in the Rails console. Prior to this version, calling inspect on an ActiveRecord model instance would display all the model's attributes by default...
Ruby on Rails
Ruby on Rails
2025-04-22 11:12:40 +0700
·
2 mins read
Solving the "must appear in the GROUP BY clause" Error in Rails and PostgreSQL
This blog will give an example of how to resolve this common error when using group_by in Active Record1. Example problemFirst, take a look at this SQL problem. Imagine you're working on a booking application where users can have multiple sessions. Y...
Software Engineer
Software Engineer
Ruby on Rails
Ruby on Rails
2024-07-10 23:00:10 +0700
·
3 mins read
How Google achieves seamless SSO across multiple domains like Gmail and Youtube?
Have you ever wondered how logging into Gmail can automatically sign you into YouTube, Google Drive, and all other Google services? This behind-the-scenes technique is called Single Sign-On (SSO). In this blog, I will show you some techniques that Go...
Software Engineer
Software Engineer
2024-10-13 18:14:25 +0700
·
2 mins read
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