PaperPage.get_absolute_url(): truandage sur le book.py

    def get_absolute_url(self):
        # We need to build the URL to the paperPage inside the digital paper
        # of the linked publication.
        # It's built with the linked publication's absolute_url + an anchor pointing
        # to the right book and the right page, 0-indexed.
        # ex: http://journal.liberation.fr/publication/liberation/460/#0_17
        # The anchor is #0_17:
        #   - 0 -> first book of the publication
        #   - 17 -> paperPage.page_number == 18
        if self.book.code == BOOK_CODE.QUOTIDIEN:
            book_index0 = 0
        else:
            book_index0 = 1
        page_index0 = self.page_number - 1
        
        return '%s#%d_%d' % (self.publication.get_absolute_url(), book_index0, page_index0)