Django problem with foreginKey in templates - django

Question

I am started learning Django and I have question. I have code like this:
from django.db import models
from django.utils import timezone
class Worker(models.Model):
firstname = models.CharField(max_length = 32, blank=False, null=False)
lastname = models.CharField(max_length = 32, blank=False, null=False)
class Computer(models.Model):
TYPE = {
(0, 'PC'),
(1, 'Laptop'),
}
workerId = models.ForeignKey(Worker, on_delete=models.SET_NULL, blank=True, null=True)
prod = models.CharField(max_length = 32, blank=False, null=False)
type = models.PositiveSmallIntegerField(default=0, choices=TYPE)
What I should do in views and templates if I want to do list with workers and theirs computers? One computer can be for one user or for no one but one worker can have a few computers.
My template for this look like:
{% block site %}
{% for work in worker %}
<p>{{ work.id }} {{ work.fullname }}
{{ work.lastname }}</p><br>
{% if comp.workerId == work.id%}
{{ comp }}
{% else %}
<p>Empty</p>
{% endif %}
{% endfor %}
{% for c in comp %}
<p>{{ c }}</p>
{% endfor %}
{% endblock %}
But I always have "Empty". Thanks for help

Answer 1

You can try like this with for-empty in template:
{% for work in worker %}
<p>{{ work.id }} {{ work.fullname }}
{{ work.lastname }}</p><br>
{% for comp in work.computer_set.all %}
{{ comp }}
{% empty %}
<p>Empty</p>
{% endfor %}
{% endfor %}

Answer 2

I've actually explained this before in 2 questions, here and here.
Basically, a ForiegnKey object is a key because it's unique for the class owning it, This means your computer has only one worker, BE SURE TO CALL IT WORKER, NOT WORKERID as this is OOP and when you access mycomputer.worker, you have a Worker object which has .id and .pk so it makes no sense to call it workerId.
Each worker now has a .computer_qs which you can change like this
workerId = models.ForeignKey(Worker,
on_delete=models.SET_NULL,
blank=True, null=True, related_name="computers")
don't forget to call it worker. now it's .computers instead of .computer_qs.
In your templates iterate workerObj.computers.all to access single computer objects and have fun with it!