mysql
We have been told many times that modifying live database should be done with extreme care, we should always make a backup before doing something big to the database. However, there are countless stories on the Internet about losing data due to various reason, one of them is forgetting to
ruby
When running a few programs (like Web server or a script), do you notice that sometimes they print out "Good bye" message before exiting? I was wondering if I could do a similar thing in Ruby and it turned out to be pretty easy. First, I learned that
A few days ago I faced an issue in my Ruby on Rails application. The issue was caused by some duplicate rows in a very large the MySQL table (more than 1,5 million rows). The obvious solution of course is to remove duplicate rows from the table and add
best practices
Temp files are necessary in cases when you need to store some data before feeding it into another program. In this post, I am going to show you several ways of creating temp files and how to use them in Ruby code. Temp files or temporary files are files created
debugging
I am working on a deep learning model for text summarization and I use TensorFlow as my main framework. It is a great framework and contains many built-in functions to ease the implementation. However, when I trained my model, it was too slow. It took about 7 seconds to train
tools
As a Web developer, we always look forward to building the best web applications. But things do not always go well with developers. Users nowadays ask for better UI, better UX. An inappropriate color for a link or a wrong position of an image on a website could become annoying
debugging
I am using OSX and I wanted to install git-cola for manage my Git projects. Unfortunately, after installing python using brew, I could not run it. When typing git cola to terminal, I kept getting the following error message: Traceback (most recent call last): File "/usr/local/bin/git-cola&
css
Designing a flexible layout which can scale to different screens on many devices is non-trivial. We often use float, position: absolution or other properties to achieve the desired result. However this process is uncomfortable to developers and we always dream of a better way. Today, I want to introduce to
UNIX is a base OS for many popular OS you are using right now, from Linux to Mac OSX. Those OS share common commands so it is pretty easy to switch from one OS to another. Because it is so important to understand and use UNIX commands, I want to
rails
One big drawback of Single-page application is the ability to fully support SEO as traditional sites. The reason is because in a single-page application we often use a technique called lazy-rendering, in which the real content is not rendered from the server but only the basic layout is returned. Many
tricks
Do you know that there is a hidden feature in Mac OSX which allows you to view information of all printers added on your Mac? Last week I was looking for a way to know the IP address of a network printer which I added a long time ago but
python
A few days ago, I was struggling to install python on a Linux machine, in which I had no root permission. That machine was shared with many other users and there was only an old python version already installed on the machine. After a bit of search and trial, I
deployment
DNS is one of the most fundamental parts of a website. No website can run without a proper configuration on DNS. For beginners, it might be a bit difficult for them to understand and resolve DNS-related issues. This post aims to provide a bit more help for those who are
best practices
We have been using SSH all the time but not all people really understand the files we put inside the ~/.ssh folder on our computer. It was a myth to me when I was first using SSH, but things are pretty clear to me now and I want to share
best practices
The other day I was working on a simple program on CentOS and I met an issue which turned out to be quite funny. At first I didn't think it worth a post here, but later I decided to put it here so that I won't
best practices
Working as a web developer, you will eventually get familiar with server configuration, like how to setting up Nginx or Apache, how to check production logs, how to tune server for better performance, etc. Almost all of those things are done via SSH. In the past, I had to log