django using object inside templates without using view - python-3.x

Question

Im new to django; I'm using include inside a template that call another template like this
{% include "cars_models.html" with user_id=request.user.id %}
is there a way to use Cars.objects.get(user_id=request.user.id) or something like inside the cars_models template direct to get all cars are related to user_id without using views
I'm trying to use cars_models templates inside another templates like widgets for base template. I'm not using any view for my base template

Answer 1

Please consider this custom template tag solution:
In the root directory create directory "templatetags". Create file car_tags.py inside the folder, add this code to that file:
from django import template
register = template.Library()
from app_name.models import Car
#register.simple_tag
def car_tag(id):
return Cars.objects.get(user_id=id)
Add library with your tag into the settings.py into TEMPLATES/OPTIONS:
'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': {
'car_tags': 'templatetags.car_tags',
}
},
In your template load your tag at the top of the template: {% load car_tags %}
Use your tag in your template this way: {% car_tag request.user.id %}

Answer 2

No, you can't use querysets in templates. You need to create one in your views and pass as context to your templates.
But if your models is something like this:
class Car(models.Model):
user = models.ForeignKey(User)
You can call all cars related to the logged user in your templates with:
{% for car in request.user.car_set.all %}
<p>{{car}}</p>
{%endfor%}
Where car_set is the RelatedManager of you model.