common.py 文件源码

def _reverse(self, viewname, args, kwargs, current_app=None, fail=True):
        from django.core.urlresolvers import reverse, NoReverseMatch

        # Try to look up the URL twice: once given the view name,
        # and again relative to what we guess is the "main" app.
        url = ''
        urlconf=kwargs.pop('urlconf', None)
        try:
            url = reverse(viewname, urlconf=urlconf, args=args, kwargs=kwargs,
                current_app=current_app)
        except NoReverseMatch as ex:
            projectname = settings.SETTINGS_MODULE.split('.')[0]
            try:
                url = reverse(projectname + '.' + viewname, urlconf=urlconf, 
                              args=args, kwargs=kwargs)
            except NoReverseMatch:
                if fail:
                    raise ex
                else:
                    return ''

        return url