reduce_allocations_rails_32.rb

# rails 3.X patch to remove extra allocations on field access
module ActiveRecord::AttributeMethods::Read::ClassMethods
  def internal_attribute_access_code(attr_name, cast_code)
    access_code = "(v=@attributes[attr_name]) && #{cast_code}"

    unless attr_name == primary_key
      access_code.insert(0, "missing_attribute(attr_name, caller) unless @attributes.has_key?(attr_name); ")
    end

    if cache_attribute?(attr_name)
      access_code = "@attributes_cache[attr_name] ||= (#{access_code})"
    end

    # this line has been changed
    "attr_name = @@attr_#{attr_name} ||= '#{attr_name}'; #{access_code}"
  end
end