unique=True在传递自定义字典时不工作?

So right now I'm editting the Querydict that the modelform gives to the view to make the submission in one field all lowercase and have no spaces. but then when I construct and pass that dictionary back to the Modelform to be validated/saved it doesn't give me an error if the same thing has been entered more than once. It seems like unique=True should work for all submissions that are in the correct format not just ones from request.POST. Any help/insight on the issue would be awesome.So right now I'm editting the Querydict that th