method

class_inheritable_accessor

v2.3.8 - Show latest stable - 2 notes - Class: Class

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What's this?

class_inheritable_accessor(*syms) public

No documentation

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# File activesupport/lib/active_support/core_ext/class/inheritable_attributes.rb, line 80
  def class_inheritable_accessor(*syms)
    class_inheritable_reader(*syms)
    class_inheritable_writer(*syms)
  end

August 19, 2009 - (>= v2.1.0)

0 thanks

Gotcha with class_inheritable_accessor and cloneing the attribute values

The key thing to note from post is that class_inheritable_accessor copies the value from the parent class at inherit time. So, if you are setting a default value of an array and doing something like the following you might end up with unintended results:

>> A.class_inheritable_foo << 'from a'
=> ["from a"]
>> B.class_inheritable_foo << 'from b'
=> ["from a", "from b"]
>> C.class_inheritable_foo << 'from c'
=> ["from a", "from b", "from c"]

However, if you use the form:

class << self
  def class_instance_foo
    @class_instance_processors ||= []
  end
end

The original values aren’t copied from the parent class when you reference the class for the first time:

>> A.class_instance_foo << 'from a'
=> ["from a"]
>> B.class_instance_foo << 'from b'
=> ["from b"]
>> C.class_instance_foo << 'from c'
=> ["from c"]

December 14, 2012 - (>= v3.2.1)

0 thanks

Now called class_attribute in Rails 3.2.x

See github.com/novafabrica/make_exportable/pull/4

class_inheritable_accessor

Related methods

No documentation

Gotcha with class_inheritable_accessor and cloneing the attribute values

Now called class_attribute in Rails 3.2.x