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had to add a magical attribute __adding on ModelForm to indicate whether we are editting or adding a model. This will be later passed into the model's .clean() method since it is necessary for correctly validating uniques (see it's current use) and can also be used to define force_insert or force_update params to model.save() Also beginning with this commit, .instance attribute is present on ModelForm and should be used to do any post-processing since manipulation of the cleaned_data will not work git-svn-id: http://code.djangoproject.com/svn/django/branches/soc2009/model-validation@10871 bcc190cf-cafb-0310-a4f2-bffc1f526a37