django.template.exceptions.TemplateSyntaxError: Invalid block tag. Did you forget to register or loa-CodePudding

I have a view that has context data and it extends base.html but as I want the context data to be displayed in all templates that extend from base.html and not only the view with the context data I am doing custom template tags with the context inside but I get an error.

view with and without context data:

class HomeView(ListView):
    model = Product
    context_object_name='products'
    template_name = 'main/home.html'
    paginate_by = 25


class HomeView(ListView):
    model = Product
    context_object_name='products'
    template_name = 'main/home.html'
    paginate_by = 25

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        categories = Category.objects.all()
        news = News.objects.all()
        context.update({
            'categories' : categories,
            'news' : news,
        })
        
        return context

base.html with and without the custom tag

{% news %}


{% for new in news %}
    <p>{{ new.title }}</p>
{% endfor %}

The custom tag file templatetags/news.py

from django import template
from support.models import News


register = template.Library()

@register.inclusion_tag('news.html', takes_context=True)
def news(context):
    return {
        'news': News.objects.order_by("-date_posted")[0:25],
    }

The custom tag file templatetags/news.html

{% for new in news %}
    <p>{{ new.title }}</p>
{% endfor %}

CodePudding user response：

Simple thing, you should load the template tag in news.html template which is registered.

Just load the tag in news.html template:

{% load tag_name %} #Add here tag name to load

Note: Please ensure that template tag setting is added in settings.py file

CodePudding user response：

You need to define the python code containing your tag codes in the TEMPLATES variable in settings.py.

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [
            str(BASE_DIR.joinpath('templates'))
        ],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
            'libraries':{
                'tagname': 'appname.news', # your template tag

            }
        },
    },
]