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require 'rspec'

class Array

  def custom_group_by(&block)
    results = {}
    
    each do |e|
      (results[block.call(e)] ||= []) << e
    end

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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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#!/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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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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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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Rails Models

Generating models

$ rails g model User

Associations

belongs_to

has_one

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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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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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# autoload concerns
module YourApp
  class Application < Rails::Application
    config.autoload_paths += %W(
      #{config.root}/app/controllers/concerns
      #{config.root}/app/models/concerns
    )
  end
end

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#!/usr/bin/env ruby 

require 'rubygems'

gempaths = Gem::default_path

puts 
puts "Scanning paths in Gem::default_path for RubyGems with native extensions ..."
puts