Django-Template：在变量块中获取变量！ [英] Django-Template : Get Variables in a Tag block !

问题描述

我需要检索保存在数据库中的一个可选编号，以及我制作的自定义模板标签。哪个要检索，这个图库中包含的变量（照片ID）。在图库循环中。

I need to retrieve an optional number saved in DB , to a custom template tag i made . which to retrieve , a variable ( a photo ID ) included in this Gallery . within the gallery loop .

{% get_latest_photo   {{photo.id}}  %} 

如何完成？

Ps：我知道可以包含标签，但在目前的时候如何使其修复这一个！

P.s : I know that can be done with inclusion tag , but in the present time how to make it fix this one !

编辑模板html文件：

Edit the template html file :

{% for album in albumslist %}

    {% get_latest_photo   photo.id  %} 
    {% for photo in recent_photos %}
<img src='{% thumbnail photo.image 200x80 crop,upscale %}' alt='{{ photo.title }}' />
    {% endfor %}
    {{ album.title }}
{% endfor %}

templatetag

templatetag

from django.template import Library, Node
from akari.main.models import *
from django.db.models import get_model

register = Library()

class LatestPhotoNode(Node):
    def __init__(self, num):
        self.num = num
    def render(self, context):
        photo = Photo.objects.filter(akar=self.num)[:1]
        context['recent_photos'] = photo
        return ''

def get_latest_photo(parser, token):
    bits = token.contents.split()
    return LatestPhotoNode(bits[1])

get_latest_photo = register.tag(get_latest_photo)

Ps当我用一个充当相册ID并从中检索照片的数字替换album.id（在{％get_latest_photo photo.id％}）中时，它工作得很好。

P.s Its working very well when i replace album.id (in {% get_latest_photo photo.id %} ) with a number which acts as an album id and retrieve the photo from .

Regards
HM

Regards H. M.

推荐答案

要正确评估 num 变量，我认为您应该修改 LatestPhotoNode 类： / p>

To evaluate correctly the num variable I think you should modify your LatestPhotoNode class like this:

class LatestPhotoNode(Node):
    def __init__(self, num):
        self.num = template.Variable(num)

    def render(self, context):
        num = self.variable.resolve(self.num)
        photo = Photo.objects.filter(akar=num)[:1]
        context['recent_photos'] = photo
        return ''

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