def get_context_data(self, **kwargs):
context = super(BookDetail, self).get_context_data(**kwargs)
context['editions'] = Book.get_editions(self.object)
context['num_pages'] = Book.get_pages(self.object)
context['lang'] = Book.get_lang(self.object)
context['format'] = Book.get_format(self.object)
context['authors'] = Book.get_authors(self.object)
context['series'] = Book.get_series(self.object)
context['cover'] = Book.get_cover(self.object)
return context
