Question

这是一种类似IMDB的关系：我有一组视频，对于每个视频，视频中都有用户信用。像 -

这样的东西

For Video 1: 
User 1 - Director
User 2 - Writer
...etc...

以下是我的模型 -

class VideoInfo(models.Model):
    title = models.CharField(max_length=256)
    uploaded_by = models.ForeignKey('UserProfile')
    credits = models.ManyToManyField('UserProfile', through='VideoCredit', blank=True, related_name='video_credits')
...

class VideoCredit(models.Model):
    video = models.ForeignKey(VideoInfo)
    profile = models.ForeignKey('UserProfile', blank=True, null=True)
    name = models.CharField(max_length=100, blank=True)
    position = models.ForeignKey(Position)
    timestamp = models.DateTimeField(auto_now_add=True)

class UserProfile(models.Model):
    user = models.ForeignKey(User, unique=True)
    ...

对于给定的用户，我想按位置分隔视频点数。像 -

这样的东西

For User A:

DIRECTOR
    - Video 1
    - Video 2
WRITER
    - Video 1
    - Video 3

...etc...

我如何在模板中完成这样的事情 -

{% for position in positions %}
    <b>{{position}}</b>
    {% for video in profile.videoinfo_set.filter(position = position) %} # ??
        {{video}}
    {% endfor %}
{% endfor %}

或者，有没有更好的方法来完成我想要做的事情？谢谢。

Answer 1

令人惊讶的是有多少人不了解regroup。

#in view    
credits = profile.videocredit_set.select_related().order_by('position') # will sort by id, but you can sort any way you like

#in template
{% regroup credits by position as credits_regrouped %}
{% for credit in credits_regrouped %}
<b>{{ credit.grouper }}</b>
<ul>
    {% for item in credit.list %}
    <li>{{ item.video }}</li>
    {% endfor %}
</ul>
{% endfor %}

Answer 2

按位置订购您的视频信息并使用{{ifchanged}}模板标记：

<强> ifchanged


检查一个值是否从循环的最后一次迭代中发生了变化。

Answer 3

以[(position1, [video1, video2, ...]), (position2,[...])] -

的形式传递元组列表

list_of_credits =[]
for position in positions:
    list_of_videos=[]
    for video in profile.videocredit_set.filter(position=position):
        list_of_videos.append(video)
    list_of_credits.append((position,list_of_videos))

{% for item in list_of_credits %}
    <p><b>{{item.0}}</b></p>
    {% for video in item.1 %}
        <p>{{video}}</p>
    {% endfor %}
{% endfor %}

迭代模板中的类别

3 个答案: