resource_views.py 文件源码

def item_view(context, request):
    frame = request.params.get('frame', 'page')
    if getattr(request, '__parent__', None) is None:
        # We need the response headers from non subrequests
        try:
            response = render_view_to_response(context, request, name=frame)
        except PredicateMismatch:
            # Avoid this view emitting PredicateMismatch
            exc_class, exc, tb = sys.exc_info()
            exc.__class__ = HTTPNotFound
            raise_with_traceback(exc, tb)
        else:
            if response is None:
                raise HTTPNotFound('?frame=' + frame)
            return response
    path = request.resource_path(context, '@@' + frame)
    if request.query_string:
        path += '?' + request.query_string
    return request.embed(path, as_user=True)