You can say DemoModel.objects.filter(id=blah blah blah).exists(). The try/catch pattern works reasonably as well — if you want to make a point in the code that you really expected the object to exist, you might use the try/catch, and use the .exists() clause when the object not existing is business as usual =)

Sorry for the code below. You may find it useful you may not but still on topic “To tell if data is there.” The proper way for templates is as such, otherwise my api example / documentation link should answer your questions about verifying the existence of a particular saved model instance.

{% for DemoModel in object_list %}
{% ifchanged %}
do something
{% else %}
do something else
{% endif %}

from django documentation Retrievieng Objects using and chaining filters:

>>> Entry.objects.filter(
...     headline__startswith='What'
... ).exclude(
...     pub_date__gte=datetime.now()
... ).filter(
...     pub_date__gte=datetime(2005, 1, 1)
... )

I am sorry I thought you were talking about you as an administrator. Which obviously is through the API. I’m sorry I thought you were new and were using template syntax when not necessary. However, yes the ideal situation would be if you can be in a model instance where DemoModel is True or DemoModel is false. That way you call it each time and it gets called correctly. In the ideal case you are in a model instance that knows rather DemoModel is true or false and you can simply do

{% if DemoModel == True %}do something{% endif %}

assuming DemoModel is a boolean field if not you can wrap it. Additionally, the api local above can be applied using template tag filters.

if DemoModel.objects.filter(id=8).count():