Unexpected behavior with subclassing a class with the Apply mixin

[bivory]

require('middleclass.init')
require('middleclass-extras.init')

ParentClass = class('ParentClass')
ParentClass:include(Apply)
function ParentClass:initialize()
   super.initialize(self)
   print("Parents Init.")
end

ChildClass = ParentClass:subclass('ChildClass')
function ChildClass:initialize()
   super.initialize(self)
   print("Child Init.")
end

local inst = ChildClass:new()

Lua 5.1.4 Copyright (C) 1994-2008 Lua.org, PUC-Rio
require 'test'
Parents Init.

[kikito]

Oh my.
I'm sorry and embarrassed.
I'm not sure when I'll be able to fix this - give me one week!

[kikito]

I haven't forgot about this one.

I've started tracking down the issue, but so far the root cause evades me. I'm pretty sure that the problem is not on Apply itself, but on Callbacks, which is an Apply dependency. It's also the most problematic module inside middleclass-extras.

I'll keep trying tomorrow.

[bivory]

No worries, it looks like it's a tougher issue. I ran out of time looking at it tonight but I'll look at it some more tomorrow too.

I think the issue has something to do with the class dictionary modification and method lookup done by the function _changeClassDict in the Callbacks module. I added some debug to the anonymous function that is set to the class dictionary __index method by _changeClassDict.

Here's the output from the child class looking for the initialize function to call:

ChildClass: looking for initialize
ChildClass: looking for initializeWithoutCallbacks
ParentClass: looking for initializeWithoutCallbacks
Parents Init.

[kikito]

The "Commend and Close" button is too close to the "Comment" button... Reminds me of http://www.codinghorror.com/blog/2010/03/the-opposite-of-fitts-law.html :)

Still working on this.

[kikito]

re-wrote the way classes are modified in Callbacks. closed by 314d5df

[kikito]

I think this is closed now. Please test and re-open if that's not the case. Sorry it took me so long to find the problem!

[bivory]

It's fixed, thanks!

No worries about the time it was a tough problem. Thanks for spending your free time working on this library, it's really useful.