mrbrdo

# collection association e.g. has_many

owners = People.all
association_name = :photos

owners.each do |owner|
  records = Array(whatever_you_want)
  
  association = owner.association(association_name)
  association.loaded!

mrbrdo

class Photo < ActiveRecord::Base
  scope :enabled, -> { where(photo: { enabled: true }) }
end

class Person < ActiveRecord::Base
  has_one :display_photo, -> {
    self.select_values = ["DISTINCT ON(photos.person_id) photos.*"]
    instance_exec(&Photo.method(:enabled)).order('photos.person_id')
    }, class_name: "Photo"
end

mrbrdo

class Person < ActiveRecord::Base
  has_many :photos
  has_one :display_photo, -> {
    self.select_values = ["DISTINCT ON(photos.person_id) photos.*"]
    order('photos.person_id')
    }, class_name: "Photo"
end

# Polymorphic association example
class Person < ActiveRecord::Base

mrbrdo

class Person < ActiveRecord::Base
  has_many :photos
  has_one :display_photo, class_name: "Photo"
end

# WARNING: This only appears to work properly!
people = Person.all.includes(:display_photo)
people.each { |person| puts person.display_photo.id }

mrbrdo

require 'java'
require 'stringio'

class ProcessBuilderWrapper
  class Status
    def initialize(status)
      @status = status
    end

    def success?

mrbrdo

module ActiveRecordGroupCount
  extend ActiveSupport::Concern

  module ExtensionMethods
    def count(*args)
      scope = except(:select).select("1")
      query = "SELECT count(*) AS count_all FROM (#{scope.to_sql}) x"
      ActiveRecord::Base.connection.execute(query).first.try(:[], "count_all").to_i
    end
  end

mrbrdo

# Add RVM to PATH for scripting
[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm"  # This loads RVM into a shell session.

__rvm_project_rvmrc

mrbrdo

module Kernel
  def companion(klass, &block)
    klass.instance_eval(&block)
    # or: klass.singleton_class.class_eval(&block)
  end
end

class Cat
end

mrbrdo

class Klass
  def self.class_method ; end
end

class Klass
  class << self
    def class_method ; end
  end
end

mrbrdo

module Kernel
  def with(object, &block)
    object.instance_eval &block
  end
end

# Simple way to use it
with "Ruby Rocks!" do
  puts self
  puts size