db.py 文件源码

def _insert_links(data_dict, limit, offset):
    '''Adds link to the next/prev part (same limit, offset=offset+limit)
    and the resource page.'''
    data_dict['_links'] = {}

    # get the url from the request
    try:
        urlstring = toolkit.request.environ['CKAN_CURRENT_URL']
    except (KeyError, TypeError):
        return  # no links required for local actions

    # change the offset in the url
    parsed = list(urlparse.urlparse(urlstring))
    query = urllib2.unquote(parsed[4])

    arguments = dict(urlparse.parse_qsl(query))
    arguments_start = dict(arguments)
    arguments_prev = dict(arguments)
    arguments_next = dict(arguments)
    if 'offset' in arguments_start:
        arguments_start.pop('offset')
    arguments_next['offset'] = int(offset) + int(limit)
    arguments_prev['offset'] = int(offset) - int(limit)

    parsed_start = parsed[:]
    parsed_prev = parsed[:]
    parsed_next = parsed[:]
    parsed_start[4] = urllib.urlencode(arguments_start)
    parsed_next[4] = urllib.urlencode(arguments_next)
    parsed_prev[4] = urllib.urlencode(arguments_prev)

    # add the links to the data dict
    data_dict['_links']['start'] = urlparse.urlunparse(parsed_start)
    data_dict['_links']['next'] = urlparse.urlunparse(parsed_next)
    if int(offset) - int(limit) > 0:
        data_dict['_links']['prev'] = urlparse.urlunparse(parsed_prev)