Django-Template : Get Variables in a Tag block !

Question

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

Answer 1

You don't put the brackets around variables when you use them in template tags.

{% get_latest_photo photo.id %}

Answer 2

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 ''

Answer 3

Are you sure your template tag is written properly? For example, you need to use Variable.resolve to properly get the values of variables: Passing Template Variables to the Tag

Answer 4

I had the same problem problem and after reading the docs, I solved it using this

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

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

If you are trying to render multiple variables, using json.dumps is very useful.