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RSpec.configure do |config|
  config.around(:all, callbacks: true) do |example|
    ActiveRecord::Base.skip_callbacks = false
    example.run
    ActiveRecord::Base.skip_callbacks = true
  end
end

ActiveRecord::Base.skip_callbacks = true

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# app/models/base.rb
module Base
  def some_method
    ImpClass.test
  end
end

# app/models/impl_class
class ImlClass
  include Base

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>>> c = [1,2,[1,2]]
1,2,1,2
>>> c.sort()
1,1,2,2
>>> c.join('--')
1--1,2--2
>>>  c.length
3
>>> c[0]
1

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class Company < AR
   has_many :users
   has_many :discounts
end

class User < AR
   belongs_to :company
   has_many :discounts
end

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class Object
  def raise_not_implemented
    raise NotImplementedError.new("Define ##{caller_locations(1,1)[0].label} for #{self.class}")
  end
end

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class << true
  def !@
    true
  end
end

class << false
  def !@
    false
  end

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module Publisher
  extend self

  # delegate to ActiveSupport::Notifications.instrument
  def broadcast_event(event_name, payload={})
    if block_given?
      ActiveSupport::Notifications.instrument(event_name, payload) do
        yield
      end
    else

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class CreateUserForm
  include ActiveModel::Model

  attr_accessor :email
  attr_accessor :name

  def initialize
    @user = User.new
  end
  

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require 'delegate'
require 'benchmark'

class User
  attr_reader :name

  def initialize(name)
    @name = name
  end
end

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smartctl 6.3 2014-07-26 r3976 [x86_64-linux-4.0.0-0.rc3.git2.1.fc23.x86_64] (local build)
Copyright (C) 2002-14, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Device Model:     Samsung SSD 850 PRO 256GB
Serial Number:    S1SUNSAFA06649M
LU WWN Device Id: 5 002538 8a0713409
Firmware Version: EXM01B6Q
User Capacity:    256,060,514,304 bytes [256 GB]
Sector Size:      512 bytes logical/physical