module ActiveFedora::AttributeMethods::ClassMethods

def instance_method_already_implemented?(method_name)

# => false
Person.instance_method_already_implemented?(:name)

# => ActiveFedora::DangerousAttributeError: save is defined by Active Record. Check to make sure that you don't have an attribute or method with the same name.
Person.instance_method_already_implemented?(:save)

end
end
'already defined by Active Fedora'
def save
class Person < ActiveRecord::Base

\Active \Record method is defined in the model, otherwise +false+.
Raises an ActiveFedora::DangerousAttributeError exception when an 
def instance_method_already_implemented?(method_name)
  raise DangerousAttributeError, "#{method_name} is defined by Active Fedora. Check to make sure that you don't have an attribute or method with the same name." if dangerous_attribute_method?(method_name)
  if superclass == Base
    super
  else
    # If ThisClass < ... < SomeSuperClass < ... < Base and SomeSuperClass
    # defines its own attribute method, then we don't want to overwrite that.
    defined = method_defined_within?(method_name, superclass, Base) &&
              !superclass.instance_method(method_name).owner.is_a?(GeneratedAttributeMethods)
    defined || super
  end
end