wagtail_hooks.py 文件源码

def serve_variant(page, request, serve_args, serve_kwargs):
    """Apply a segment to a visitor before serving the page.

    :param page: The page being served
    :type page: wagtail.wagtailcore.models.Page
    :param request: The http request
    :type request: django.http.HttpRequest
    :returns: A variant if one is available for the visitor's segment,
              otherwise the original page
    :rtype: wagtail.wagtailcore.models.Page

    """
    user_segments = []
    if not isinstance(page, models.PersonalisablePageMixin):
        return

    adapter = get_segment_adapter(request)
    user_segments = adapter.get_segments()

    if user_segments:
        metadata = page.personalisation_metadata

        # TODO: This is never more then one page? (fix query count)
        metadata = metadata.metadata_for_segments(user_segments)
        if metadata:
            variant = metadata.first().variant.specific
            return variant.serve(request, *serve_args, **serve_kwargs)