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const memoize = (fn) => {
	let cache = {}, key;
	return (...args) => {
		key = JSON.stringify(args);
		return cache[key] || (cache[key] = fn.call(null, ...args));
	}
};

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Rails Models

Generating models

$ rails g model User

Associations

belongs_to

has_one

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Polymorphic Associations reversed

It's pretty easy to do polymorphic associations in Rails: A Picture can belong to either a BlogPost or an Article. But what if you need the relationship the other way around? A Picture, a Text and a Video can belong to an Article, and that article can find all media by calling @article.media

This example shows how to create an ArticleElement join model that handles the polymorphic relationship. To add fields that are common to all polymorphic models, add fields to the join model.

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Install ImageMagick for image conversion:

brew install imagemagick

Install tesseract for OCR:

brew install tesseract --all-languages

Or install without --all-languages and install them manually as needed.

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#!/bin/ruby --verion => 2.0.0-p353

Self

In Ruby, self is a special variable that always references the current object.

• Inside class or module definition, self refer to the Class or Module object.
• Inside instance method, self refer to future instance object.
• Inside class method, self refer to the class.i

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require 'spec_helper'

describe Model do

  it "has a valid factory" do
    expect(build(:factory)).to be_valid
  end

  # Lazily load factory so its only used when needed.
  let(:factory_instance) { build(:parent) }

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Rails Rspec APIs Testing Notes

Folders Structure

  spec
  |--- apis #do not put into controllers folder. 
        |--- your_api_test_spec.rb  
  |--- controllers
  |--- models
  |--- factories
 |--- views

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# PUT THIS IN THE `spec_helper.rb` file
# <><><><><><><><><><><>
RSpec.configure do |config|
  # Allows for shorthand version of FactoryGirl syntax.
  config.include FactoryGirl::Syntax::Methods
#...
end


# <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>

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Africa/Abidjan
Africa/Accra
Africa/Addis_Ababa
Africa/Algiers
Africa/Asmara
Africa/Asmera
Africa/Bamako
Africa/Bangui
Africa/Banjul
Africa/Bissau

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r = Rails.application.routes
r.recognize_path "/children"
r.methods - Object.methods