Python Topic.get_cached_videos_for_topic方法代码示例

# 需要导入模块: from models import Topic [as 别名]
# 或者: from models.Topic import get_cached_videos_for_topic [as 别名]
    def get(self, readable_id=""):

        # This method displays a video in the context of a particular topic.
        # To do that we first need to find the appropriate topic.  If we aren't
        # given the topic title in a query param, we need to find a topic that
        # the video is a part of.  That requires finding the video, given it readable_id
        # or, to support old URLs, it's youtube_id.
        video = None
        topic = None
        video_id = self.request.get('v')
        topic_id = self.request_string('topic', default="")
        readable_id = urllib.unquote(readable_id).decode("utf-8")
        readable_id = re.sub('-+$', '', readable_id)  # remove any trailing dashes (see issue 1140)

        # If either the readable_id or topic title is missing,
        # redirect to the canonical URL that contains them
        redirect_to_canonical_url = False
        if video_id: # Support for old links
            query = Video.all()
            query.filter('youtube_id =', video_id)
            video = query.get()

            if not video:
                raise MissingVideoException("Missing video w/ youtube id '%s'" % video_id)

            readable_id = video.readable_id
            topic = video.first_topic()

            if not topic:
                raise MissingVideoException("No topic has video w/ youtube id '%s'" % video_id)

            redirect_to_canonical_url = True

        if topic_id is not None and len(topic_id) > 0:
            topic = Topic.get_by_id(topic_id)
            key_id = 0 if not topic else topic.key().id()

        # If a topic_id wasn't specified or the specified topic wasn't found
        # use the first topic for the requested video.
        if topic is None:
            # Get video by readable_id just to get the first topic for the video
            video = Video.get_for_readable_id(readable_id)
            if video is None:
                raise MissingVideoException("Missing video '%s'" % readable_id)

            topic = video.first_topic()
            if not topic:
                raise MissingVideoException("No topic has video '%s'" % readable_id)

            redirect_to_canonical_url = True

        exid = self.request_string('exid', default=None)

        if redirect_to_canonical_url:
            qs = {'topic': topic.id}
            if exid:
                qs['exid'] = exid

            urlpath = "/video/%s" % urllib.quote(readable_id)
            url = urlparse.urlunparse(('', '', urlpath, '', urllib.urlencode(qs), ''))
            self.redirect(url, True)
            return

        # If we got here, we have a readable_id and a topic, so we can display
        # the topic and the video in it that has the readable_id.  Note that we don't
        # query the Video entities for one with the requested readable_id because in some
        # cases there are multiple Video objects in the datastore with the same readable_id
        # (e.g. there are 2 "Order of Operations" videos).
        videos = Topic.get_cached_videos_for_topic(topic)
        previous_video = None
        next_video = None
        for v in videos:
            if v.readable_id == readable_id:
                v.selected = 'selected'
                video = v
            elif video is None:
                previous_video = v
            else:
                next_video = v
                break

        # If we're at the beginning or end of a topic, show the adjacent topic.
        # previous_topic/next_topic are the topic to display.
        # previous_video_topic/next_video_topic are the subtopics the videos
        # are actually in.
        previous_topic = None
        previous_video_topic = None
        next_topic = None
        next_video_topic = None

        if not previous_video:
            previous_topic = topic
            while not previous_video:
                previous_topic = previous_topic.get_previous_topic()
                if previous_topic:
                    (previous_video, previous_video_topic) = previous_topic.get_last_video_and_topic()
                else:
                    break

        if not next_video:
#.........这里部分代码省略.........