The Tiến dthtien

Originally published in June 2008

When hiring Ruby on Rails programmers, knowing the right questions to ask during an interview was a real challenge for me at first. In 30 minutes or less, it's difficult to get a solid read on a candidate's skill set without looking at code they've previously written. And in the corporate/enterprise world, I often don't have access to their previous work.

To ensure we hired competent ruby developers at my last job, I created a list of 15 ruby questions -- a ruby measuring stick if you will -- to select the cream of the crop that walked through our doors.

What to expect

Candidates will typically give you a range of responses based on their experience and personality. So it's up to you to decide the correctness of their answer.

Rails 5.2 with webpacker, bootstrap, stimulus starter

This gist will collect all issues we solved with Rails 5.2 and Webpacker

Create Project

# Last few parameters(--skip-* part) is only my habbit not actully required
$ rails new <project_name> --webpack=stimulus --database=postgresql --skip-coffee --skip-test

Simple automated GIT Deployment using GIT Hooks

Here are the simple steps needed to create a deployment from your lokal GIT repository to a server based on this in-depth tutorial.

How it works

You are developing in a working-copy on your local machine, lets say on the master branch. Most of the time, people would push code to a remote server like github.com or gitlab.com and pull or export it to a production server. Or you use a service like my Deepl.io to act upon a Web-Hook that's triggered that service.

Install Terminator (shell)

sudo add-apt-repository ppa:gnome-terminator
sudo apt-get update
sudo apt-get install terminator

Terminator should be setup as default now. Restart your terminal (shortcut: "Ctrl+Alt+T").

	FROM ruby:2.3.1

	# Install dependencies
	RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs

	# Set an environment variable where the Rails app is installed to inside of Docker image:
	ENV RAILS_ROOT /var/www/app_name
	RUN mkdir -p $RAILS_ROOT

	# Set working directory, where the commands will be ran:

	# config valid for current version and patch releases of Capistrano
	lock "~> 3.11.0"
	set :message, "Deploy voucher trader api app"
	set :application, "voucher_trader_api"
	set :repo_url, "[email protected]:dthtien/voucher_trader_api.git "
	set :deploy_user, 'deploy'
	# Default branch is :master
	# ask :branch, `git rev-parse --abbrev-ref HEAD`.chomp

	# Default deploy_to directory is /var/www/my_app_name

	- Check rails version
	$ rails -v

	- To update rails
	$ gem update rails

	- Creating a new rails app using postgresql
	$ mkdir rails_projects
	$ cd rails_projects
	$ rails new myapp --database=postgresql

	## 1) What is SQL Injection


	QL Injection is a security vulnerability where an attacker can run arbitrary SQL code on your machine because we are not using safe Active Record practices.
	## 2) Which of these are safe from SQL Injection attacks?

	A) safe

	User.where(:name => params[:name])

	## Week 5 Quiz

	## 0) Name 3 types of variables in Ruby? Put them in order from least scope to greatest.
	1. Local variable(new = "foo")
	2. Instan variable(@new="foo")
	3.Constant(NEW="foo")


	## 1) Where do SQL queries belong, the view or controller?


	## 1) Instance or class method?

	A) User.where(:name => 'rich')
	- class method