ken mazaika kenmazaika

Rebuilding Your Database.

Unfortunately databases migrations will only run a single time for a given environment (once for localhost / once for heroku). That means that once it ran the migration, it added the picture column to the users table and that it was done. Any time you run "rake db:migrate" again it doesn't know that the migration changed so it won't do anything.

You may want to revisit this video, for more in-depth details about database migrations.

So rule of thumb: never edit a migration after you run it.

When your database is out of sync with the rules that we wrote to build them up. Often times the easiest thing to do will be to tear down your database and put it back up. You will lose all you user/places/etc but by running all of them start to finish again you won't run the migration in the intermediate state.

Engineering a Content-Hub with Rails API and React, Redux & WebPack

Traditional blogging engines, like Wordpress, treat the content of a blog post as the most important element of the page. Other elements, like widgets and plugins are often disjointed and second class citizens in comparison to the content itself. A wide array of plugins exist in Wordpress, but getting them to work perfectly can be a challenge.

Breaking the problem down I decided that a blog post could be a collection of BlogPostComponents (and the content of the post is just one such component) and set off to build a JSON API in Rails that could be consumed by a React front-end to be the ulitmate user experience on the blog.

This project is an interesting case study in building a production ready react app, including a number of gotchas along the way.

I'll start with a brief high-level overview of React and Redux for people unfamiliar with the concepts, and explain the application logic code. I then will dive into the more advanced

Box Model Example

A simple webpage to showcase the difference between setting an item's margin vs. padding and an in-depth process of considering the implications of the CSS Model Model.

	rm -rf /.git
	rm -rf /vagrant/.git
	rm -rf /vagrant/src/.git
	git rev-parse --show-toplevel
	cat .git/config

	module Luhn
	def self.is_valid?(num)
	digits = num.to_s.split("").collect(&:to_i)
	new_digits = []
	digits.reverse.each_with_index do \|digit, index\|
	if index % 2 == 1
	digit = digit * 2
	digit = digit - 9 if digit >= 10
	end
	new_digits << digit

	class User < ActiveRecord::Base
	# Include default devise modules. Others available are:
	# :confirmable, :lockable, :timeoutable and :omniauthable
	devise :database_authenticatable, :registerable,
	:recoverable, :rememberable, :trackable, :validatable

	acts_as_followable
	acts_as_follower
	end

	class Game < ActiveRecord::Base
	belongs_to :white_user, class_name: 'User', foreign_key: "white_user_id"

	end

	class User < ActiveRecord::Base
	has_many :white_games, class_name: 'Game', foreign_key: "white_user_id" # => app/models/game.rb
	has_many :black_games, class_name: 'Game', foreign_key: "black_user_id" # => app/models/game.rb

	class TreeNode
	def initialize(value = nil, left = nil, right = nil)
	@value = value
	@left = left
	@right = right
	end

	def set_value(value)
	@value = value
	end

	{
	id: 1,
	title: "29 Ways to Be unstoppabel",
	slug: "29-Ways-to-Be-unstoppabel",
	status: "draft",
	created_at: "2016-06-30T16:19:58.376Z",
	updated_at: "2016-06-30T16:19:58.376Z",
	components: [{
	id: 2,
	post_id: 1,