Test case for https://github.com/rails/rails/issues/12570

issue_ 12570.rb

unless File.exists?('Gemfile')
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'
    gem 'rails', '4.0.4'
    gem 'sqlite3'
  GEMFILE
end

require 'bundler'
Bundler.setup(:default)

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

ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :sites, force: true do |t|
    t.string :repo
    t.string :env
    t.integer  "build", default: 0, null: false
  end
end

class Site < ActiveRecord::Base
  BUILD = { manual: 0, cap: 1, recap: 2 }

  def build
    BUILD.key(read_attribute(:build))
  end

  def build=(b)
    write_attribute(:build, BUILD[b])
  end
end

class TestBuildSymbol < MiniTest::Unit::TestCase
  def test_find_or_create_by_with_build
    # It will create the 3 records, because there isn't any record on the
    # database.
    # It works, because it will do: Site.create(attributes) which have access
    # to Site#build= because it is an instace of Site.
    Site.find_or_create_by(repo: 'bob', env: 'staging', build: :recap)
    Site.find_or_create_by(repo: 'joe', env: 'staging', build: :manual)
    Site.find_or_create_by(repo: 'jim', env: 'staging', build: :manual)
    assert_equal 3, Site.count

    # It will not return the record, since the Site#build will not be used,
    # because it is not an instance of Site here.
    assert_nil Site.find_by(repo: 'bob', env: 'staging', build: :recap)

    # It will work correctly
    assert Site.find_by(repo: 'bob', env: 'staging', build: 2).present?
  end
end