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Polymorphic Associations in Rails 4, Part2

reference:

Part1: astockwell.com

Part2: astockwell.com

PAIN POINT

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Rails 4 with Rspec 3

Configure your Gemfile

# Gemfile
group :development, :test do
  gem 'rspec-rails', '~> 3.0.0'
  gem 'factory_girl_rails'
  gem 'capybara'

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Alternative polymorphic model

Here's a fully working example:

# The migration file:
class CreateUserEntities < ActiveRecord::Migration
  def change
    create_table :user_entities do |t|
      t.integer :user_id

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# rails methods

# returns column_names arrays
Model.column_names

# returns attr_keys arrays
object.attributes.keys

# returns attr_keys values
object.attributes.values

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# rails migration

########################
# add column to exsting table
########################

def up
  add_column :users, :status, :string
  User.find_each do |user|
    user.status = 'active'

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# ref: http://www.jimmycuadra.com/posts/metaprogramming-ruby-class-eval-and-instance-eval)

class Person
end

Person.class_eval do
  def say_hello
   "Hello!"
  end
end

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rails generator dictionary

basic

$ rails g model user email age:integer

• data_type
  • integer
  • primary_key

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##########################################################
# polymorphic as module
##########################################################

# app/models/comment.rb
#

class Comment < ActiveRecord::Base
  belongs_to :commenter, :polymorphic => true
end

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// CSS dictionary

// <a href="#" rel="friend nofollow">Larry</a>
li a[rel~='friend'] {
  font-weight: bold;
}

// target only #upperSection, #lowerSection
// <div id="upperSection">
//     <p>Lorem ipsum dolor sit amet...</p>

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# 나는 이녀석을 참고했다.
# http://linfiniti.com/2012/05/installing-postgis-2-0-on-ubuntu/
#
# 환경변수에 LC_COLLATE=C 이거 있는지 확인

#1. Install PostgreSQL postgis and postgres

sudo dpkg --purge postgis postgresql-9.1-postgis
sudo apt-get install python-software-properties