Alternative ssr template

alternative_ssr_template

def alternate_ssr_template(ssr_template, default_args_pos):
    """
    Decorator which changes the template and context for non-ajax
    server-side requests.
    This decorator MUST be first because it uses func_defaults.

    `ssr_template`:      Replacement template.
    `default_args_pos`:  The position of the 'template' argument that will
                         be replaced in the list of default arguments
                         for the function.
    """
    def caller(func):
        def wrapper(*args, **kwargs):
            """
            We take the default template used in Ajax requests and
            set it as a context variable. The template variable for the
            function is then changed to the ssr template, and
            the changed function is returned.
            """
            request = args[0]
            if not request.is_ajax():
                new_ctx = {'template_name': func.func_defaults[default_args_pos]}
                kwargs['ctx'] = new_ctx
                kwargs['template'] = ssr_template

            return func(*args, **kwargs)
        return wrapper
    return caller