Polymorphic Associations & STI don't record the correct model type

This is an oldie, but I run across it as a problem from time to time. Patch with included test applies to 2.3.x for belongs_to assocations.

I'm currently using Rails 2.3.8 and the resource_type on the STI/Polymorphic table isn't being set. BTW, I have the following construction:

D belongs_to :resource, :polymorphic => true

A has_many :groups, :as => :resource, :dependent => :destroy
B has_many :groups, :as => :resource, :dependent => :destroy
C has_many :groups, :as => :resource, :dependent => :destroy

Note: The D model is both polymorphic and the STI bass class.

Anyway, I'm wondering, if I'm missing a step somewhere and/or this patch hasn't been applied to the 2.3.8?

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I've updated Trek's patch to apply to v2.3.11. All AR tests still pass.