issue5717.rb

gem "rails", "~> 3.2.0"
require "active_record"
require "logger"

ActiveRecord::Base.establish_connection(
  adapter:  "sqlite3",
  database: ":memory:"
)

puts ActiveRecord::VERSION::STRING

ActiveRecord::Schema.define do
  create_table :manufacturers

  create_table :products do |t|
    t.integer :manufacturer_id
    t.string  :name
  end
end

class Manufacturer < ActiveRecord::Base
  has_many :products, :inverse_of => :manufacturer
end

class Product < ActiveRecord::Base
  belongs_to :manufacturer, :inverse_of => :products

  def self.by_name
    order(:name)
  end
end

m = Manufacturer.create
m.products.create

ActiveRecord::Base.logger = Logger.new(STDERR)

Manufacturer.first.products.first.manufacturer
puts "--"

products = Manufacturer.first.products

p products.method(:first).source_location
p products.method(:where).source_location

products.where("1=1").first.manufacturer