This is a post in series "What I Touched"
Useful for test related to time.
Limit for root user must be added explicity. Wildcard ‘*’ does not match root.
Decimal is consider as integer in MySQL, set scale explicitly.
change_column :products, :discount_percentage, :decimal, precision: 5, scale: 2
Generate API Doc from comments.
Message Queue using Golang.
Algorithm to generate a maze using random walk.
Helper for Redux reducers.