def page(request, slug, template=u"pages/page.html", extra_context=None):
    """
    Select a template for a page and render it. The request
    object should have a ``page`` attribute that's added via
    ``yacms.pages.middleware.PageMiddleware``. The page is loaded
    earlier via middleware to perform various other functions.
    The urlpattern that maps to this view is a catch-all pattern, in
    which case the page attribute won't exist, so raise a 404 then.

    For template selection, a list of possible templates is built up
    based on the current page. This list is order from most granular
    match, starting with a custom template for the exact page, then
    adding templates based on the page's parent page, that could be
    used for sections of a site (eg all children of the parent).
    Finally at the broadest level, a template for the page's content
    type (it's model class) is checked for, and then if none of these
    templates match, the default pages/page.html is used.
    """

    from yacms.pages.middleware import PageMiddleware
    if not PageMiddleware.installed():
        raise ImproperlyConfigured("yacms.pages.middleware.PageMiddleware "
                                   "(or a subclass of it) is missing from " +
                                   "settings.MIDDLEWARE_CLASSES or " +
                                   "settings.MIDDLEWARE")

    if not hasattr(request, "page") or request.page.slug != slug:
        raise Http404

    # Check for a template name matching the page's slug. If the homepage
    # is configured as a page instance, the template "pages/index.html" is
    # used, since the slug "/" won't match a template name.
    template_name = str(slug) if slug != home_slug() else "index"
    templates = [u"pages/%s.html" % template_name]
    method_template = request.page.get_content_model().get_template_name()
    if method_template:
        templates.insert(0, method_template)
    if request.page.content_model is not None:
        templates.append(u"pages/%s/%s.html" % (template_name,
            request.page.content_model))
    for parent in request.page.get_ascendants(for_user=request.user):
        parent_template_name = str(parent.slug)
        # Check for a template matching the page's content model.
        if request.page.content_model is not None:
            templates.append(u"pages/%s/%s.html" % (parent_template_name,
                request.page.content_model))
    # Check for a template matching the page's content model.
    if request.page.content_model is not None:
        templates.append(u"pages/%s.html" % request.page.content_model)
    templates.append(template)
    return TemplateResponse(request, templates, extra_context or {})
Select a template for a page and render it. The request
    object should have a ``page`` attribute that's added via
    ``yacms.pages.middleware.PageMiddleware``. The page is loaded
    earlier via middleware to perform various other functions.
    The urlpattern that maps to this view is a catch-all pattern, in
    which case the page attribute won't exist, so raise a 404 then.

    For template selection, a list of possible templates is built up
    based on the current page. This list is order from most granular
    match, starting with a custom template for the exact page, then
    adding templates based on the page's parent page, that could be
    used for sections of a site (eg all children of the parent).
    Finally at the broadest level, a template for the page's content
    type (it's model class) is checked for, and then if none of these
    templates match, the default pages/page.html is used.