module ActiveRecord::AttributeMethods::Read

def _read_attribute(attr_name, &block) # :nodoc:

:nodoc:
breaking compatibility with the read_attribute API
This method exists to avoid the expensive primary_key check internally, without 
def _read_attribute(attr_name, &block) # :nodoc:
  @attributes.fetch_value(attr_name, &block)
end

def read_attribute(attr_name, &block)

casting behavior, see the types under ActiveModel::Type.)
to Date.new(2004, 12, 12). (For information about specific type
has been type cast. For example, a date attribute will cast "2004-12-12"
Returns the value of the attribute identified by +attr_name+ after it 
def read_attribute(attr_name, &block)
  name = attr_name.to_s
  name = self.class.attribute_aliases[name] || name
  @attributes.fetch_value(name, &block)
end