Calvin.My

Read YAML file in Java

Convenience way to set configuration

Snippet Java YAML Jackson

Posted by Calvin Chieng on June 14, 2018, 13:44

Increase file descriptor for RabbitMQ

For ubuntu 16.04

Snippet Ubuntu RabbitMQ Config

Posted by Calvin Chieng on May 16, 2018, 20:44

Install new version of Ruby via rbenv

For mac and homebrew & For ubuntu

Snippet Ruby rbenv

Posted by Calvin Chieng on May 1, 2018, 22:52

Rails API Authentication

None, Basic, Token and ApiKey Authentication

Snippet Rails Authentication API

Posted by Calvin Chieng on April 10, 2018, 17:02

Integrate Google Sign-In

Using Google OAuth2 with Omniauth

Snippet Ruby Google Oauth2 Omniauth

Posted by Calvin Chieng on January 28, 2018, 18:13

Handling weekdays, weekends and public holidays

By using various built-in methods in Ruby and Rails

Snippet Ruby Rails Date Time

Posted by Calvin Chieng on January 23, 2018, 01:11

Use .gitignore to prevent committing unwanted files

Logs, temporary files, credentials are not supposed to be committed into git repository

Snippet Ruby Git Gitignore Android

Posted by Calvin Chieng on December 2, 2017, 00:34

Deploying Java app as daemon

Via systemd or init.d

Snippet Java Jar Upstart Systemd Deployment

Posted by Calvin Chieng on November 29, 2017, 15:23

Reconstruct query string from request

For string compare or generate signature hash

Snippet Ruby Rails Controller

Posted by Calvin Chieng on August 7, 2017, 18:30

Preview ActionMailer email content

Without actually sending out the email

Snippet Rails ActionMailer Test

Posted by Calvin Chieng on July 30, 2017, 01:26

Avoiding table name conflict when multiple delayed job accessing the same database

When you have multiple apps connecting to the same database

Snippet Rails Delayed Job Database

Posted by Calvin Chieng on July 25, 2017, 12:03

Rails SMTP setting without authentication

A common mistake to remove SMTP authentication

Snippet Rails SMTP

Posted by Calvin Chieng on July 22, 2017, 15:29

Test rails mailer with RSpec

Functional and Spec testing

Snippet RSpec Rails Mailer Test ActionMailer

Posted by Calvin Chieng on July 8, 2017, 15:57

Load SMTP setting dynamically

From database or user's input

Snippet Rails Email SMTP

Posted by Calvin Chieng on July 6, 2017, 23:31

Using a custom config file

Store application specific configuration in a custom config file

Snippet Rails Config

Posted by Calvin Chieng on July 6, 2017, 21:32