module ActiveFedora::AttributeMethods::ClassMethods

Public Instance Methods

dangerous_class_method?(method_name) click to toggle source

A class method is ‘dangerous’ if it is already (re)defined by Active Record, but not by any ancestors. (So ‘puts’ is not dangerous but ‘new’ is.)

# File lib/active_fedora/attribute_methods.rb, line 83
def dangerous_class_method?(method_name)
  RESTRICTED_CLASS_METHODS.include?(method_name.to_s) || class_method_defined_within?(method_name, Base)
end
instance_method_already_implemented?(method_name) click to toggle source

Raises an ActiveFedora::DangerousAttributeError exception when an Active Record method is defined in the model, otherwise false.

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

Person.instance_method_already_implemented?(:save)
# => 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?(:name)
# => false
Calls superclass method
# File lib/active_fedora/attribute_methods.rb, line 49
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

Private Instance Methods

generate_method(name) click to toggle source

@param name [Symbol] name of the attribute to generate

# File lib/active_fedora/attribute_methods.rb, line 102
def generate_method(name)
  generated_attribute_methods.synchronize do
    define_attribute_methods name
  end
end