No scope pollution

no_scope_pollution.rb

gem 'activerecord', '~>3.2.1'

require 'active_record'
require 'minitest/autorun'
require 'logger'

# Ensure backward compatibility with Minitest 4
Minitest::Test = MiniTest::Unit::TestCase unless defined?(Minitest::Test)

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :posts do |t|
    t.integer :status
  end
end

class Post < ActiveRecord::Base
  scope :status_1, ->{
    post = Post.where(status: 2).first

    if post.blank?
      raise "None found"
    end

    where("1=1")
  }
end

class BugTest < Minitest::Test
  def test_association_stuff
    Post.create!(status: 1)
    Post.create!(status: 2)

    post_1 = Post.status_1.first
    assert_equal 1, post_1.status

    post_2 = Post.where(status: 2).first
    assert_equal 2, post_2.status

    Post.where(status: 1).status_1.first
  end
end