Ruby on Rails

I feel like I'm missing something obvious here..

I have a Post object and it has a draft attribute. It may be nil,
true or false. I want nil to be treated as false

Post.where(:draft => false) does not pick up the posts where draft is
unset(nil)

This leaves me to query with

Post.where('draft is NOT true')

Is there a cleaner way to do this? I prefer using hash conditions.
I could set the draft boolean before_save but it seems wasteful.

Thanks in advance

Tony

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