Conainer commands Commands to run a container: docker container ls -a docker container rm 123 456 # you only need first 2-3 characters for identification docker container run --publish 8080:80 --name ng nginx docker run -d -p 3801:3306 --name mysql -e MYSQL_ALLOW_EMPTY_PASSWORD='yes' mysql:
We can use reflect package for retrieving field name and value dynamically from a struct. package main import ( "fmt" "reflect" ) type Foo struct { aa string ff string } func main() { foo := Foo{"x", "y"} t := reflect.TypeOf(foo) // => Returns a type Type
A simple list of multiple usages of map in Go: package main import "fmt" func main() { // Like in Ruby, values in maps passed to functions are original values, // modifying the values will modify the original. // Declaration: // var my_map map[string]string, or: my_map := make(map[string]
Rails console is convenient that we enter the console with the Rails application fully loaded. We do not need to load any class or library before using it. However, it would be great if we do the same in any other Ruby application, especially when we're developing a
Basically in Ruby we can include instance methods and extend class methods from a module. However, sometimes we just want to be lazy that we can do both from one module. Let's say we have a module A. module A def b puts "method b from module
Sometimes we need our Ruby application runs in background. The best way to achieve so is to make it a background process using gems like daemons. They are easy to install and use. However, this post aims to do the same without any third-party library. Ruby has a built-in library
Rails 5 is released a few days ago, and ActionCable is one of the most notable features. The following is a very simple but workable example. Installation Add gems to the Gemfile: # Rails must be newer than 5.0 gem 'rails', '>= 5.0.0' # ActionCable
Minitest do not come with any feature for testing requests, unlike request spec in RSpec. Fortunately, controller tests are able to test through everything in the backend like request tests if we don't mock anything. Here's how a controller test works. A Basic Controller Test A
In a previous post I used minitest/reporters but I found myself still in love with the RSpec style of output. I accidentally found Maxitest which offers an alternative for printing this form of result. Basically it looks like this: Looks familiar, right? I switched to this output and felt
I've used RSpec for testing for two years, and I feel like it's time to try something new. Minitest is another popular testing framework for Rails. After several days of trying in a new proejct, I found it very different and efficient in some ways. In
When configuring unicorn for my rails app on an Ubuntu 14.04 server, an error suddenly occured to me. When running sudo service myapp restart, which is basically a unicorn script for start serving my app, it tells me the following message. /home/ubuntu/.rvm/gems/ruby-2.1.3/gems/
Here's how to deploy a Gin app to vps once you've initated and ssh in a VPS running Ubuntu 14.04. Installing Nginx & Dependencies Install some libraries that most environments require. sudo apt-get update sudo apt-get install build-essential libssl-dev libyaml-dev libreadline-dev openssl curl git-core zlib1g-dev