utils.py 文件源码

def get_query_string(request, **kwargs):
    """
    Conditional query string creator. Only useful for boolean parameters.
    """
    qs = QueryDict('', mutable=True)

    for name, condition in iteritems(kwargs):
        try:
            value = request.GET[name]
        except KeyError:
            pass
        else:
            if condition and value:
                qs[name] = 1

    return qs