How to delete template cache varing on variables in Django

Vitalii Mytenko 0
Viewed 16

In my Django template I have a block cached:

{% cache 300 markers_list request.user.pk request.LANGUAGE_CODE %}
    {% for marker in page_obj.object_list %}
    {{ marker }}
{% endcache %}

I use a signal to invalidate a cache:

@receiver(signal=[post_save, post_delete], sender=Marker)
def clear_cache_block(sender, request, **kwargs):
    key = make_template_fragment_key("markers_list", [request.user.pk, request.language_code])
    cache.delete(key)

I do not understand how to get [request.user.pk, request.language_code].

If I add request to clear_cache_block(sender, request, **kwargs) I get an error:

clear_cache_block() missing 1 required positional argument: 'request'
django-signals signals caching django python
1 Answers

I do not know is this a good solution or there are some better ones, so I handled it with this code:

from django.utils.translation import get_language

@receiver(signal=[post_save, post_delete], sender=Marker)
def clear_cache_block(sender, **kwargs):
    user = kwargs["instance"].owner_id
    user_language = get_language()
    key = make_template_fragment_key("markers_list", [user, user_language])
    cache.delete(key)

Or one more is:

@receiver(signal=[post_save, post_delete], sender=Marker)
def clear_cache_block(sender, instance, **kwargs):
    user = instance.owner_id
    user_language = get_language()
    key = make_template_fragment_key("markers_list", [user, user_language])
    cache.delete(key)
Vitalii Mytenko0
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