How to set ForeignKey in CreateView?

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I solved this by overriding form_valid method. Here is verbose style to clarify things:

class CreateArticle(CreateView):
    model = Article

    def form_valid(self, form):
        article = form.save(commit=False)
        article.author = self.request.user
        #article.save()  # This is redundant, see comments.
        return super(CreateArticle, self).form_valid(form)

Yet we can make it short (thanks dowjones123), this case is mentioned in docs.:

class CreateArticle(CreateView):
    model = Article

    def form_valid(self, form):
        form.instance.author = self.request.user
        return super(CreateArticle, self).form_valid(form)

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