On Apr 5, 2010, at 9:37 PM, steve ross wrote:
> On Apr 5, 2010, at 8:09 AM, Pat Maddox wrote:
>>
>> Sounds like a lot of work
>>
>>
>> On Apr 3, 2010, at 9:08 PM, Julian Leviston wrote:
>>
>>> Sorry I meant send AND __send__
>>>
>>> Julian.
>>>
>>> On 04/04/2010, at 11:45 AM, Julian Leviston wrote:
>>>
>>>>
>>>> On 04/04/2010, at 7:32 AM, David Chelimsky wrote:
>>>>
>>>>> On Sat, Apr 3, 2010 at 8:56 AM, Vojto Rinik <[email protected]> wrote:
>>>>>> Hello RSpec users!
>>>>>> I have one abstract class and a few classes that inherit from that
>>>>>> abstract
>>>>>> one.
>>>>>
>>>>> Ruby doesn't have abstract classes. You can have a base class that you
>>>>> don't _intend_ to instantiate directly, but there's nothing stopping
>>>>> you from doing so, so it's not like an abstract class in java, which
>>>>> you actually can't instantiate directly.
>>>>>
>>>>> I've seen some cases where the initialize method is made private so
>>>>> you can't just call Foo.new, so it sort of feels like an abstract
>>>>> class, but even in that case you can still use send() to instantiate
>>>>> one in a test:
>>>>>
>>>>> AbstractIshClass.send(:new)
>>>>>
>>>>
>>>> How about if you overrode new and __new__ ?
>>>>
>>>> Julian.
>
> How about:
>
> class AbstractClassException < RuntimeError; end
> class AbstractishClass
> def initialize
> raise AbstractClassException.new("don't do that.")
> end
> end
>
> That way, even sending a message to new causes a failure. And that's what
> you're looking for, right?
As Matt suggested earlier in this thread, this is not really idiomatic Ruby. If
you want behavior in a structure that is not directly instantiable, use a
module:
module GeneralBehavior
def something_general
...
end
end
class SpecificClass
include GeneralBehavior
end
describe GeneralBehavior do
it "does something general" do
klass = Class.new {
include GeneralBehavior
}
klass.new.something_general.should .....
end
end
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